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General Port Protection

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Mode B can be used with any Ethernet application as can Mode A. ... The keypads and various buttons found on a cell phone can be an entry way for ESD. – PowerPoint PPT presentation

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Title: General Port Protection


1
Littelfuse Training 2014
  • General Port Protection
  • Application Guides

2
  • AC / DC Power Applications

3
Block Diagram of Power Supply - AC Input and DC
Output
4
Circuit Protection of AC Input
  • Design Notes
  • Protection Application Products that are
    directly connected to the AC mains (120 to
    250VACrms) will be exposed to severe surge
    transients (lightning, load switching, etc.) and
    short circuit/overload conditions. Because of
    this, robust protection devices should be
    selected.
  • Solution Description Fuse A cartridge or
    leaded fuse (Pico, 5x20mm, 2AG, 3AG, TE5/TR5) can
    be used for short circuit and overload current
    conditions. For AC protection, the typical
    solutions would be 250V-rated 3AG/3AB fuses like
    the 325/326 series or the 5x20 fuses like the
    ceramic 215/216. For ratings that are 15A, 16A or
    20A, LF now have a smaller footprint 5x20
    solution in the 215 series as an option to the
    6x32 footprints of 326/325 series. For customers
    that are used to using the TR/TE platform or in
    need of a smaller pitch, you could consider the
    latest TE400 but its interrupt rating is
    130A_at_250Vac only.
  • OVP For surge protection, an MOV or TVS Diode
    should be used. The MOV or TVS Diode should be
    selected based on the expected severity (energy,
    voltage and peak pulse current) of the transient
    surge. The specific family can be determined
    after the surge severity is understood.
  • Regulatory Issues Standards will vary depending
    on the product to be protected. Examples
    include
  • IEC 61000-4-5
  • UL1414
  • UL1449
  • Unique Features Does not apply.
  • Application Warnings When selecting the fuse,
    be sure to consider the expected temperature in
    the area around the fuse, as well as the in-rush
    currents. Failure to take these factors into
    account may result in premature or nuisance
    tripping of the fuse.

Radial MOV, TVS Diode
MOV Options CIII, Ultra MOV, LA Series SMD
TVS Diode Options P4SMA,SMAJ,P6SMB,
SMBJ,SMC,SMD, SMF 200W, and SDxxC Axial Leaded
TVS P4/6/1.5KE, 3KP30KP, AK115
5
Circuit Protection of DC Output
  • Design Notes
  • Protection Application The DC output of the
    power supply will experience less severe
    transient surges than the AC input. For this
    reason, circuits where added protection is
    desired, TVS diodes can be used. There will
    typically be multiple DC circuits, including
    3.3V, -5V, 5V, -12V and 12VDC.
  • Solution Description As shown at the left, a
    TVS diode can be used to provide additional
    transient protection on each DC output of the
    power supply. This will minimize the transient
    stress on the power components on the respective
    DC power buses.
  • Companion Solutions Does not apply.
  • Regulatory Issues Standards will vary depending
    on the product to be protected. Examples
    include
  • IEC 61000-4-5
  • UL1414
  • UL1449
  • Unique Features Does not apply.
  • Application Warnings Does not apply.

SMD TVS Diode Options P4SMA,SMAJ,P6SMB,
SMBJ,SMC,SMD, SMF 200W, and SDxx Axial Leaded
TVS P4/6/1.5KE, 3KP30KP, AK115
6
Circuit Protection of DC Input
Design Notes Protection Application For
customers that are using a PFC which changes AC
to DC directly in some of the high DC power
supply circuits. Solution Description You
would need to consider the 400Vdc 5x20 477
series. For customers that require a
significantly higher DC interrupt-rating in
industrial or UPS applications. The small
footprint 6x32 505 series , with a breaking
capacity of 10kA to 30kA_at_500Vdc for ratings from
16A to 30A, would come in handy as well. The 477
and 505, being 5x20 and 6x32, are smaller
footprint options for DC protection. Companion
Solutions NA Regulatory Issues Standards
will vary depending on the product to be
protected. Examples include IEC 61000-4-5
UL1414 UL1449 Unique Features The small
footprint 6x32 505 series , with a breaking
capacity of 10kA to 30kA_at_500Vdc for ratings from
16A to 30A, would come in handy. The 477 and 505,
being 5x20 and 6x32, are smaller footprint
options for DC protection. Application Warnings
When selecting the fuse, be sure to consider the
expected temperature in the area around the fuse,
as well as the in-rush currents. Failure to take
these factors into account may result in
premature or nuisance tripping of the fuse. Road
Map Products to be Watching for None
MOV Options CIII, Ultra MOV, LA Series SMD
TVS Diode Options P4SMA,SMAJ,P6SMB,
SMBJ,SMC,SMD, and SMF 200W, Axial Leaded TVS
P4/6/1.5KE, 3KP30KP, AK115
7
Circuit Protection of DC Input
Design Notes Protection Application For
portable devices that include an external AC
adapter, a DC voltage (typically in the range of
3.3VDC to 5VDC) will be supplied to the unit.
The electrical threats include ESD, low-level
lightning surges, and overcurrent conditions
(short circuit or overload). Solution
Description As shown at the left, a fuse or PTC
can be used for short circuit and overload
current conditions. For surge and ESD
protection, a discrete diode can be
used. Companion Solutions Other solutions
exist in the SPA portfolio such as the SP1007
Series 0402 and 0201 TVS Diodes. Regulatory
Issues For ESD, the IEC 61000-4-2 will be the
most appropriate standard, and for lightning
immunity the IEC 61000-4-5 may be
consulted. Unique Features The SP1003 has
ultra-low leakage of 100nA. The SP1005 is 0201
form factor and capable of 10A of
lightning-induced surge (tP8/20µs). The SDxx
Series can handle up to 30A of lightning-induced
surge (tP8/20µs). Application Warnings
None Road Map Products to be Watching for N/A
SMD TVS Diode Array Options SP1003-01ETG
(0402) SP1005-01ETG (0402) SP1005-01WTG
(0201) SDxx-01FTG (0805)
8
  • Low Speed Applications

9
Circuit Protection of Keypads and Buttons
Design Notes Protection Application The
keypads and various buttons found on a cell phone
can be an entry way for ESD. These circuits are
low-voltage DC switches, typically less than
5VDC. Solution Description The examples shown
at the left contain four lines for demonstration
purposes. The actual number will vary by
application. In the top example, discrete diodes
are used to provide board layout flexibility. In
the bottom example, a single diode array is used
to reduce part count. Companion Solutions
Other solutions within the LF portfolio exist in
addition to these recommendations. For example,
diode arrays with different channel counts (2-5
lines) can be used to match the actual conditions
of the cell phone. Regulatory Issues The IEC
61000-4-2 will be the most appropriate standard
that applies for these circuits. It supplies a
test method for verifying that the end product is
not susceptible to ESD events. Unique Features
SP1005 is 0201 form factor Road Map Products to
be Watching for None
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR2.5V Channels VRWM Packaging
SP1001-04XTG 15kV 8pF 4 6V SOT553
SP1001-04JTG 15kV 8pF 4 6V SC70-5
SP1011-04UTG 15kV 7pF 4 6V µDFN-6
SP1003-01ETG 25kV 17pF 1 5V SOD882
SP1005-01WTG 30kV 23pF 1 6V 0201 Flipchip
10
Circuit Protection of Keypads and Switches
Design Notes Protection Application The keypads
and various buttons found various applications
can be an entry way for ESD. These circuits are
low-voltage DC switches, typically less than
5VDC. Solution Description The examples shown
at the left contain four lines for demonstration
purposes. The actual number will vary by
application. In this example, discrete
multilayer varistors are used to provide board
layout flexibility. Companion Solutions Other
solutions within the LF portfolio exist in
addition to these recommendations. For example,
MLV arrays (4 lines) can be used to reduce part
count and save board space. Regulatory Issues
The IEC 61000-4-2 will be the most appropriate
standard that applies for these circuits. It
supplies a test method for verifying that the end
product is not susceptible to ESD events. Unique
Features Does not apply. Application Warnings
Does not apply.
V5.5MLA0402 Multilayer Varistor (200pF)
V5.5MLA0402
11
Circuit Protection of Audio Lines
Design Notes Protection Application For the
audio lines, the typical signal has maximum value
of 5.5 Vp-p, and has a maximum frequency less
than 30kHz. At this frequency, the capacitance
of the suppressor does not need to be taken into
account. The electrical threat is ESD.
Solution Description As shown at the left,
silicon protection arrays or discrete diodes can
be used for layout flexibility. Bi-directional
devices are shown due to the analog nature of the
audio signals. However, if the negative signal
does not exceed -0.3V, a unidirectional device
may be used. This usually occurs when the analog
signal is biased above ground or 0V. Companion
Solutions Several unidirectional arrays exist
if applicable. Regulatory Issues The IEC
61000-4-2 will be the most appropriate standard
that applies for this port. It supplies a test
method for verifying that the end product is not
susceptible to ESD events. Unique Features
0201 form factor, symmetrical BDV Road Map
Products to be Watching for None
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR2.5V Channels VRWM Packaging
SP1002-02JTG 8kV 5pF 2 6V SC70-5
SP1005-01WTG 30kV 23pF 1 6V 0201 Flipchip
SP1007-01WTG 8kV 3.5pF 1 6V 0201 Flipchip
SP1004-04VTG 8kV 5pF 4 6V SOT953
12
Circuit Protection of Video Lines
Design Notes Protection Application The video
signals used in S-video and Composite video
formats vary between 0.5 and 2.0Vp-p, with a
maximum frequency of 5MHz. At this frequency,
the capacitance of the suppressor needs to be
taken into account. The signal lines to be
protected from ESD include Luminance and
Chrominance for S-video, and the single conductor
for Composite video. Solution Description As
shown at the left, bi-directional diodes can be
used to provide ESD protection to the video
lines. Companion Solutions Other solutions
within the LF portfolio exist in addition to
these recommendations. For example, if the board
space usage needs to be minimized, 0201 diodes
can be used (SP1005 or SP1007). Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this
port. Application Warnings The F-type
connector shown at the left is specifically for
set top box-to-monitor video circuits. If the
F-type connector is for CATV or Satellite inputs,
then lightning surges become a concern and MLVs
cannot be used. In this case, GDTs are required.
See the page on CATV and Satellite inputs for
more details. Unique Features The SP1012-05WTG
offers 5 channels in an 0402 sized package
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR2.5V Channels VRWM Packaging
SP1002-02JTG 8kV 5pF 2 6V SC70-5
SP1004-04VTG 8kV 5pF 4 6V SOT953
SP1012-05WTG 15kV 6.5pF 5 6V Flipchip
13
Circuit Protection of Video Lines
Design Notes Protection Application The video
signals used in S-video and Composite video
formats vary between 0.5 and 2.0Vp-p, with a
maximum frequency of 5MHz. At this frequency,
the capacitance of the suppressor needs to be
taken into account. The signal lines to be
protected from ESD include Luminance and
Chrominance for S-video, and the single conductor
for Composite video. Solution Description As
shown at the left, discrete multilayer varistors
are recommended for protection. Due to the
analog nature of the video signals, uni-polar TVS
diode arrays are not recommended as the may clip
the negative part of the video signal. Companion
Solutions Other solutions within the LF MLV
portfolio exist in addition to these
recommendations. For example, if the
manufacturing process cannot handle 0402-size
components, devices with the same characteristics
can be found in 0603-size components. Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this port.
It supplies a test method for verifying that the
end product is not susceptible to ESD
events. Unique Features Does not
apply. Application Warnings The F-type
connector shown at the left is specifically for
set top box-to-monitor video circuits. If the
F-type connector is for CATV or Satellite inputs,
then lightning surges become a concern and MLVs
cannot be used. In this case, GDTs are required.
See the page on CATV and Satellite inputs for
more details.
14
Circuit Protection of a Battery Pack
Design Notes Protection Application The power
bus of the battery pack should be protected
against an overcurrent runaway condition of the
Li-ion cell, as well as from ESD. The control
line (e.g. SMBus, I2C, etc.) may also need to be
protected against ESD. These are all low voltage
(lt6VDC) circuits. Solution Description As
shown at the left (top), discrete TVS diodes can
be used for layout flexibility with respect to
ESD protection. An alternative (left, bottom) is
to use a single diode array to save part count.
In both cases, the overcurrent solution can be a
strap (or SMD) resettable PTC, or an SMD chip
fuse. Companion Solutions Other solutions
exist in the SPA portfolio such as the
SP1003-01ETG (0402, SOD882) and SDxx (0805,
SOD323) Regulatory Issues With respect to
safety of the battery pack, the following
standards supply test methods UL 1642, UL 2054,
IEC 61960, IEC 62133. With respect to ESD, the
IEC 61000-4-2 supplies a test method for
verifying that the end product is not susceptible
to ESD events. Unique Features SP1005 is 0201
form factor and capable of 10A of surge
(tP8/20µs) Application Warnings Care should
be taken during the PTC and fuse selection
process to ensure the proper performance of the
overcurrent device. The key consideration is the
expected temperature of the battery pack as this
will affect the trip point and trip time of the
overcurrent protector.
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR2.5V Channels VRWM Packaging
SP1003-01ETG 25kV 17pF 1 5V SOD882
SP1005-01WTG 30kV 23pF 1 6V 0201 Flipchip
SP0503BAHTG 30kV 30pF 3 5.5V SOT143
SD05-01FTG 30kV 300pF 1 5.0V SOD323
15
  • Data Ports and High-Speed
  • Applications/Interfaces

16
Circuit Protection of a USB 1.1 Port
Design Notes Protection Application The data
signals used in a USB 1.1 port vary between 0V to
0.48V, with a maximum data rate of 12Mbps. At
this data rate, the capacitance of the suppressor
needs to be taken into account. The signal lines
to be protected from ESD include D and D-. The
5VDC power bus should be protected against ESD
and overcurrent events. Solution Description
As shown at the left, a discrete diode is used on
the power bus for ESD protection, and a PTC is
used for resettable overcurrent protection. For
the data lines, a two-channel silicon protection
array can be used for board layout
flexibility. Companion Solutions Other
solutions within the LF portfolio exist in
addition to these recommendations. For example,
if the operating current on the power bus is
higher or lower, an appropriately rated PTC can
be chosen. Regulatory Issues The IEC 61000-4-2
will be the most appropriate standard that
applies for this port.
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR2.5V Channels VRWM Packaging
SP1001-02JTG 15kV 8pF 2 6V SC70-3
SP1001-02XTG 15kV 8pF 2 6V SOT553
SP1003-01ETG 30kV 17pF 1 5V SOD882
SP0502BAJTG 30kV 30pF 2 5.5V SC70-3
SP0502BAHTG 30kV 30pF 2 5.5V SOT23-3
17
Circuit Protection of a USB 1.1 Port
Design Notes Protection Application The data
signals used in a USB 1.1 port vary between -0.5V
to 0.5V, with a maximum data rate of 12Mbps. At
this data rate, the capacitance of the suppressor
needs to be taken into account. The signal lines
to be protected from ESD include D and D-. The
5VDC power bus should be protected against ESD
and overcurrent events. Solution Description As
shown at the left, a multilayer varistor is used
on the power bus for ESD protect, and a PTC is
used for resettable overcurrent protection. For
the data lines, discrete multilayer varistors can
be used for board layout flexibility, or to
reduce part count, a single Diode array can be
used. Companion Solutions Other solutions
within the LF portfolio exist in addition to
these recommendations. For example, if the
operating current on the power bus is higher or
lower, an appropriately rated PTC can be
chosen. Regulatory Issues The IEC 61000-4-2
will be the most appropriate standard that
applies for this port. It supplies a test method
for verifying that the end product is not
susceptible to ESD events. Unique Features Does
not apply. Application Warnings Does not apply.
18
Circuit Protection of a USB 2.0 Port
Design Notes Protection Application The data
signals used in a USB 2.0 port vary between 0V to
0.48V, with a maximum data rate of 480Mbps. At
this data rate, the capacitance of the suppressor
needs to be minimized. The signal lines to be
protected from ESD include D and D-. The 5VDC
power bus should be protected against ESD and
overcurrent events. Solution Description As
shown at the left, a PTC is used for resettable
overcurrent protection while the data lines and
power bus are protected from ESD with a
two-channel diode array (1pF). Companion
Solutions Other solutions within the LF
portfolio exist in addition to these
recommendations. For example, if the operating
current on the power bus is higher or lower, an
appropriately rated PTC can be chosen. Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this port.
It supplies a test method for verifying that the
end product is not susceptible to ESD
events. Unique Features The SP3014-02UTG has
the lowest dynamic resistance in the industry
today for market leading protection of state of
the art IC geometries.
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR1.65V Channels VRWM Packaging
SP3014-02UTG 15kV 1.0pF 2 5V uDFN-6
SP3003-02XTG 8kV 0.65pF 2 6V SOT553
SP0504SHTG 12kV 0.85pF 4 6V SOT23-6
SP3030-01ETG 20kV 0.5pF 1 5V SOD882
SP1003-01ETG 30kV 17pF 1 5V SOD882
19
Circuit Protection of a USB 2.0 Port
Design Notes Protection Application The data
signals used in a USB 2.0 port vary between -0.5V
to 0.5V, with a maximum data rate of 480Mbps.
At this data rate, the capacitance of the
suppressor needs to be minimized. The signal
lines to be protected from ESD include D and D-.
The 5VDC power bus should be protected against
ESD and overcurrent events. Solution Description
As shown at the left, a multilayer varistor is
used on the power bus for ESD protect, and a PTC
is used for resettable overcurrent protection.
For the data lines, discrete PulseGuard
suppressors can be used for board layout
flexibility, or to reduce part count, a single
PulseGuard array can be used. Companion
Solutions Other solutions within the LF
portfolio exist in addition to these
recommendations. For example, if the operating
current on the power bus is higher or lower, an
appropriately rated PTC can be chosen. Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this port.
It supplies a test method for verifying that the
end product is not susceptible to ESD
events. Unique Features Does not
apply. Application Warnings Does not apply.
20
Circuit Protection of a USB 3.0 Port
Design Notes Protection Application USB3.0
adds two new data pair to the legacy D pair
namely SSTX, SSTX-, SSRX, and SSRX-. These new
super-speed lines will operate at a maximum data
rate of 5Gbps while the old D will operate at a
maximum of 480Mbps. At these data rates, the
capacitance needs to be minimized. The signal
lines need to be protected from ESD, and the 5VDC
power bus should be protected against ESD and
overcurrent events. Solution Description As
shown at the upper left, a PTC is used for
resettable overcurrent protection while the
super-speed data lines are protected with an
ultra-low capacitance diode array. Furthermore,
another diode array is used for ESD protection of
D as well as the power bus. Companion
Solutions Other solutions within the LF
portfolio exist such a fully integrated six
channel protection array (lower left) to further
minimize part count and simplify the board
design. Regulatory Issues The IEC 61000-4-2
will be the most appropriate standard that
applies for this port. Road Map Products to be
Watching for SP3015 Series Ultra-Low
Capacitance (0.3pF) Diode Array
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR1.65V Channels VRWM Packaging
SP0524PUTG 12kV 0.5pF 4 5V µDFN-10
SP3014-02UTG 15kV 1.0pF 2 5V uDFN-6
SP3012-06UTG 12kV 0.5pF 6 5V µDFN-14
SP3030-01ETG 20kV 0.5pF 1 5V SOD882
SP3022-01xTG 20kV 0.35pF 1 5V SOD882 0201 Flipchip
21
Circuit Protection of a USB 3.0 Port
Design Notes Protection Application USB3.0
adds two new data pair to the legacy D/D- pair
namely SSTX, SSTX-, SSRX, and SSRX-. These new
super-speed lines will operate at a maximum data
rate of 5Gbps while the old D/D- will operate at
a maximum of 480Mbps. At these data rates, the
capacitance of the suppressor needs to be
minimized. The signal lines need to be protected
from ESD, and the 5VDC power bus should be
protected against ESD and overcurrent
events. Solution Description As shown at the
upper left, a PTC is used for resettable
overcurrent protection while the super-speed data
lines are protected with PulseGuard polymer ESD
suppressors. Companion Solutions Other
solutions within the LF portfolio exist such as
0201 PGBs for space constrained
applications. Regulatory Issues The IEC
61000-4-2 will be the most appropriate standard
that applies for this port. It supplies a test
method for verifying that the end product is not
susceptible to ESD events. Unique Features Does
not apply. Application Warnings Does not apply.
22
Circuit Protection of a HDMI Port
Design Notes Protection Application The data
signals used in High Definition Multimedia
Interface ports vary between approximately 2.5V
and 3.5V, and have a data rate up to 3,400Mbps.
The signal lines to be protected from ESD include
D0, D1, D2, CLK. Solution Description Due
to the extremely high rate of data transfer, the
capacitance of the ESD suppressor must be
minimized. As shown at the left, two ultra-low
capacitance (0.5pF) silicon protection arrays can
be used. Companion Solutions Alternatively,
combinations of single channel, dual channel, and
even six channel devices could be used as
needed. Regulatory Issues The IEC 61000-4-2
will be the most appropriate standard that
applies for this port. It supplies a test method
for verifying that the end product is not
susceptible to ESD events. Unique Features
Ultra-low capacitance, flat over DC bias
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR1.65V Channels VRWM Packaging
SP0524PUTG 12kV 0.5pF 4 5V µDFN-10
SP3014-02UTG 15kV 1.0pF 2 5V uDFN-6
SP3012-06UTG 12kV 0.5pF 6 5V µDFN-14
SP3030-01ETG 20kV 0.5pF 1 5V SOD882
SP3022-01xTG 20kV 0.35pF 1 5V SOD882 0201 Flipchip
23
Circuit Protection of a HDMI Port
Design Notes Protection Application The data
signals used in High Definition Multimedia
Interface ports vary between approximately 2.5V
and 3.5V, and have a data rate of 1,600Mbps. The
signal lines to be protected from ESD include R,
R-, G, G-, B, B-, Cl and Cl-. Solution
Description Due to the extremely high rate of
data transfer, the capacitance of the ESD
suppressor must be minimized. As shown at the
left, discrete PulseGuard suppressors can be
used for board layout flexibility, or to reduce
part count, array versions can be used. Companion
Solutions Does not apply. Regulatory Issues
The IEC 61000-4-2 will be the most appropriate
standard that applies for this port. It supplies
a test method for verifying that the end product
is not susceptible to ESD events. Unique
Features The PulseGuard solution has the
industrys lowest capacitance value. This
feature ensures that it will maintain the signal
integrity of high-speed data ports. Application
Warnings Does not apply.
PGB1010603 / PGB1010402
24
Circuit Protection of DisplayPort
Design Notes Protection Application Each port
has a main link which contains 4 differential
pairs or lanes (i.e. ML0, ML1, ML2, and ML3).
The total throughput is 10.8Gbps or 2.7Gbps per
lane, and the clock signal is embedded in the
lanes and does not exist separately as in
HDMI There is also an auxiliary channel (AUX),
hot plug detect (HPD), and power pin
(PWR). Solution Description Due to the high
rate of data transfer, the capacitance of the ESD
suppressor must be minimized. As shown at the
left, two ultra-low capacitance (0.5pF) silicon
protection arrays can be used. Companion
Solutions Alternatively, combinations of single
channel, dual channel, and even six channel
devices could be used as needed. Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this port.
It supplies a test method for verifying that the
end product is not susceptible to ESD
events. Unique Features Ultra-low capacitance,
flat over DC bias
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR1.65V Channels VRWM Packaging
SP0524PUTG 12kV 0.5pF 4 5V µDFN-10
SP3014-02UTG 15kV 1.0pF 2 5V uDFN-6
SP3012-06UTG 12kV 0.5pF 6 5V µDFN-14
SP3030-01ETG 20kV 0.5pF 1 5V SOD882
SP3022-01xTG 20kV 0.35pF 1 5V SOD882 0201 Flipchip
25
Circuit Protection of a 1394 Port
Design Notes Protection Application IEEE 1394
uses a low-voltage differential signaling system
operating between 1.20V to 2.00V, with a maximum
data rate of 400 Mbps (1394a) to 1,600 Mbps
(1394b). At these data rates, the capacitance of
the suppressor needs to be minimized. The signal
lines to be protected against ESD include TPA,
and TPB. The 30VDC power bus should be
protected against ESD and overcurrent
events. Solution Description As shown at the
left, a multilayer varistor is used on the power
bus for ESD protection, and a PTC is used for
resettable overcurrent protection. For the data
lines, SP3003-04 protection array can be
used. Companion Solutions Other solutions
within the LF portfolio exist in addition to
these recommendations. For example, leaded PTCs
can be substituted for the SMD versions and
several other options exist in the TVS Diode
Array portfolio. Regulatory Issues The IEC
61000-4-2 will be the most appropriate standard
that applies for this port. It supplies a test
method for verifying that the end product is not
susceptible to ESD events. Application Warnings
It is recommended that only resettable
protection devices like PTCs be used on hot-plug
ports like 1394.
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR1.65V Channels VRWM Packaging
SP3003-04ATG 8kV 0.65pF 4 6V MSOP-10
SP0524PUTG 12kV 0.5pF 4 5V µDFN-10
SP3014-02UTG 15kV 1.0pF 2 5V uDFN-6
SP3030-01ETG 20kV 0.5pF 1 5V SOD882
SP3022-01xTG 20kV 0.35pF 1 5V SOD882 0201 Flipchip
26
Circuit Protection of a 1394 Port
Design Notes Protection Application IEEE 1394
uses a low-voltage differential signaling system
operating between 1.20V to 2.00V, with a maximum
data rate of 400 Mbps (1394a) to 1,600 Mbps
(1394b). At these data rates, the capacitance of
the suppressor needs to be minimized. The signal
lines to be protected against ESD include TPA,
TPA-, TPB and TPB-. The 30VDC power bus should
be protected against ESD and overcurrent
events. Solution Description As shown at the
left, a multilayer varistor is used on the power
bus for ESD protection, and a PTC is used for
resettable overcurrent protection. For the data
lines, discrete PulseGuard suppressors can be
used for board layout flexibility, or to reduce
part count, a single PulseGuard array can be
used. Companion Solutions Other solutions
within the LF portfolio exist in addition to
these recommendations. For example, leaded PTCs
can be substituted for the SMD versions, or a TVS
diode can be substituted for the MLV. Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this port.
It supplies a test method for verifying that the
end product is not susceptible to ESD
events. Unique Features Does not
apply. Application Warnings It is recommended
that only resettable protection devices like PTCs
be used on hot-plug ports like 1394.
27
Circuit Protection of a eSATA Port
Design Notes Protection Application eSATA is
a subset of the SATA protocol that uses 2
differential pairs for communication. Four lines
need to be protected per port (i.e. TX and RX),
and currently eSATA is capable of running raw
data rates of 1.5Gbps (Gen 1) and 3.0Gbps (Gen
2) Solution Description As shown at the left,
a SP0524P TVS Diode Array an be used for ESD
protection as thats the mostly likely
threat. Companion Solutions Other solutions
within the LF portfolio exist in addition to
these recommendations. For example, several other
options exist in the TVS Diode Array portfolio
and some are included below. Regulatory Issues
The IEC 61000-4-2 will be the most appropriate
standard that applies for this port. It supplies
a test method for verifying that the end product
is not susceptible to ESD events. Application
Warnings Does not apply.
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR1.65V Channels VRWM Packaging
SP0524PUTG 12kV 0.5pF 4 5V µDFN-10
SP3014-02UTG 15kV 1.0pF 2 5V uDFN-6
SP3030-01ETG 20kV 0.5pF 1 5V SOD882
SP3022-01xTG 20kV 0.35pF 1 5V SOD882 0201 Flipchip
28
Circuit Protection of a CATV/Satellite Input
Design Notes Protection Application The
broadcast signals carried by the CATV and
Satellite inputs operate in the radio frequency
range. The frequencies extend up to 1,000 MHz
for CATV and 2,500 MHz for Satellite. Due to the
high frequency nature of these signals, the
capacitance of the suppressor must be taken into
account to avoid signal attenuation. The
electrical threats will be lightning surges and
ESD. Solution Description As shown at the
left, a single gas discharge tube is used to
protect the input signal line. The specific part
number is determined by matching the surges peak
pulse current value to that of the appropriate
GDT. Typical GDT used for CATV
145V/150V/230V. Regulatory Issues Since this
input is susceptible to lightning transients,
standards such as UL 1449 and IEC 61000-4-5
should be consulted for test conditions.
Typically, the 8x20?s waveform is used. Unique
Features Because of GDTs low self-capacitance
of typ. 0.5 to 1 pF, GDT does not disturb the
system even at high frequencies. It is
recommended to ground either the shielding or
conductor. Application Warnings PulseGuard
suppressors also have very low capacitance
values, but should not be used on this input
line. The PulseGuard devices are not robust
enough to protect against lightning transients
they are specifically designed for ESD protection.
29
Circuit Protection of an Antenna
Design Notes Protection Application The
majority of real-time data signals carried by
antennas operate at radio frequency levels. As
an example, Bluetooth operates at 2.4GHz. Due to
the high frequency nature of these signals, the
capacitance of the suppressor must be taken into
account to avoid signal attenuation. The
electrical threat will be ESD. Solution
Description Most all applications will require
the ultra-low capacitance of a PulseGuard
suppressor (and higher standoff voltage) to
protect the antenna element but some lower
voltage applications like Bluetooth, will only
require a 5V standoff. Companion Solutions For
FM antennas in smart phones, mobile phones, or
MP3 players the SP1007 Series SPA could be used
(shown to the left) and for Bluetooth antennas
the SP3022 Series can be used. Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this
circuit. It supplies a test method for verifying
that the end product is not susceptible to ESD
events. Unique Features 0201 form factor,
symmetrical BDV
Potential Solutions
Ordering Number ESD Level I/O Capacitance _at_ VR2.5V Channels VRWM Packaging
SP1007-01WTG 8kV 3.5pF 1 6V 0201 (Flipchip)
SP3022-01xTG 20kV 0.35pF 1 5V SOD882 0201 Flipchip
30
Circuit Protection of an Antenna
Design Notes Protection Application The
real-time data signals carried by the antenna
operate at radio frequency levels. As an
example, Bluetooth operates at 2.4 GHz. Due to
the high frequency nature of these signals, the
capacitance of the suppressor must be taken into
account to avoid signal attenuation. The
electrical threat will be ESD. Solution
Description As shown at the left, a single
PulseGuard suppressor is used to protect the
antenna element. Companion Solutions For
space-constrained applications, an 0402 or 0201
version is currently available. Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this
circuit. It supplies a test method for verifying
that the end product is not susceptible to ESD
events. Unique Features Does not
apply. Application Warnings Does not apply.
Road Map Products to be Watching for Does not
apply
PGB1010402 /PGB1010603
31
Circuit Protection of an LCD Module
Design Notes Protection Application For
typical LCD modules, the data transfer rate is
less than 20 Mbps, so protection devices with
capacitance values less than 40 pF can be used.
The electrical threat is ESD and potentially EMI
(Electromagnetic Interference). Solution
Description As shown at the top left, a
multi-channel EMI Filter can be sued for ESD
protection and filtering of frequencies in the
cellular band (800-3000MHz). Companion
Solutions Other solutions within the Silicon
Protection Array portfolio exist. For example,
if EMI is not a concern, then any multi-channel
silicon protection array can be used or ESD
protection (bottom left). Furthermore, if data
transfers (e.g. MDDI) take place at high speeds
(gt1,000 Mbps), then a silicon protection array
with low capacitance should be used to maintain
signal integrity (i.e. SP300x). Regulatory
Issues The IEC 61000-4-2 will be the most
appropriate standard that applies for this
port. Unique Features SP600x Series integrate
between 20-40 components into a single pkg
SP6002-04
SP6002-06
Potential Solutions
Ordering Number ESD Level Line Capacitance _at_ VR2.5V Channels VRWM Packaging
SP6002-04UTG-1 30kV 30pF 4 5V µDFN-8
SP6002-06UTG-1 30kV 30pF 6 5V µDFN-12
SP6003-04UTG-1 12kV 14pF 4 5V µDFN-8
SP6003-06UTG-1 12kV 14pF 6 5V µDFN-12
SP1001-04XTG 15kV 8pF 4 5V SOT553
SP1001-04JTG 15kV 8pF 4 5V SC70-5
32
Circuit Protection of a Touchscreen
Design Notes Protection Application There are
many different types of touchscreens (i.e.
resistive, capacitive, optical, etc) and each may
require unique protection schemes. The
electrical threat is ESD the majority of the
time. Solution Description As shown at the
left, a multi-channel array can be used for ESD
protection. Companion Solutions Other
solutions within the Silicon Protection Array
portfolio exist such as the SP1011-04UTG and the
SP1012-05WTG which has the densest form factor in
the market today. Regulatory Issues The IEC
61000-4-2 will be the most appropriate standard
that applies for this port. Unique Features
The SP1012 integrates 5 channels of protection in
a 0402 sized footprint for space constrained
applications found in consumer prodcuts.
Potential Solutions
Ordering Number ESD Level Line Capacitance _at_ VR2.5V Channels VRWM Packaging
SP3002-04UTG 12kV 0.85pF 4 6V µDFN-6
SP1012-05WTG 15kV 6.5pF 5 6V Flipchip
SP3030-01ETG 20kV 0.5pF 1 5V SOD882
SP3022-01xTG 20kV 0.35pF 1 5V SOD882 0201 Flipchip
SP1011-04UTG 15kV 7pF 4 6V µDFN-6
33
Circuit Protection of a Sensor Input
Design Notes Protection Application The
sensor input provides an interface between the
patient and the measurement circuits. The
electrical threat will be ESD. Solution
Description As shown at the left, a single TVS
diode is used to protect the sensor
input. Companion Solutions The SP1005 and
SP1007 Series could also be used if a smaller
form factor is needed. Regulatory Issues The
IEC 61000-4-2 will be the most appropriate
standard that applies for this circuit. It
supplies a test method for verifying that the end
product is not susceptible to ESD events. Unique
Features The SP1003 has ultra-low leakage of
100nA. Application Warnings None Road Map
Products to be Watching for None
Potential Solutions
Ordering Number Surge (tP8/20µs) ESD Level I/O Capacitance _at_ VR2.5V Channels VRWM Packaging
SP1003-01ETG 7A 25kV 17pF 1 5V SOD882
SP1005-01WTG 10A 30kV 23pF 1 6V 0201 Flipchip
SP1005-01ETG 8A 30kV 23pF 1 6V SOD882
SP1007-01WTG 2A 8kV 3.5pF 1 6V 0201 Flipchip
SP1007-01ETG 2A 8kV 3.5pF 1 6V SOD882
34
Circuit Protection of a RS-232 Port
Design Notes Protection Application The
signals used in an RS-232 port can vary between
24V (MAX), but typically the signal swing is
limited to 12V with a maximum data rate of
256kbps. Since this is a low-speed system, the
capacitance of the suppressor is not a concern.
The signal lines to be protected from ESD include
RD, TD, RTS, CTS and sometimes DSR and DTR as
well. Solution Description As shown at the
left, a SM15 diode array can be used for signal
swings of 15V, but for higher voltage
implementations the SM24 or SM36 can be
considered. Companion Solutions Other
solutions within the LF portfolio exist in
addition to these recommendations. For example,
if the signal swing is only between 5V and GND
most any SPA would be acceptable (example 2x
SP0503BAHTG). Regulatory Issues The IEC
61000-4-2 will be the most appropriate standard
that applies for this port. It supplies a test
method for verifying that the end product is not
susceptible to ESD events.
Potential Solutions
Ordering Number Surge (tP8/20µs) ESD Level I/O Capacitance Channels VRWM Packaging
SM15-02HTG 17A 30kV 75pF 1 15V SOT23-3
SM24-02HTG 7A 30kV 65pF 1 24V SOT23-3
SP724AHTG 3A 8kV 3pF 4 20V SOT23-6
SP725ABTG 14A 8kV 5pF 4 30V SOIC-8
35
Circuit Protection of a RS-232 Port
Design Notes Protection Application The RS-232
standard (also known as RS-232-C) allows signals
up to -24, but many applications will only drive
to 5 volts and ground. The maximum data rate is
20kbps. Since this is a low-speed system, the
capacitance of the suppress is not a concern.
The signal lines to be protected from ESD and
lightning induced surges for inter-building type
applications include RD (receive data), TD
(transmit data), RTS (Request To Send), CTS
(Clear To Send), DSR (Data Set Ready) and DTR
(Data Terminal Ready). This interface is also
known as a V.24 or V.28 port. Solution
Description As shown at the left, the Q12A/SAMC
SIDACtor devices can be used for intra-building
applications while the Q22C/SCMC would be used
for high exposure environment applications. Comp
anion Solutions Other solutions within the LF
portfolio exist in addition to these
recommendations. For example, if the signal
voltages will be limited in the range from -5V to
5V, then an MLV with a lower operating voltage
can be chosen. Regulatory Issues The IEC
61000-4-5 for outdoor applications will be the
most appropriate standard that applies for this
port. It supplies a test method for verifying
that the end product is not susceptible to
lightning induced surge events.GR-1089 and ITU
K.20 or K.21 may also apply.
Potential Solutions
36
Circuit Protection of a RS-485 Port
Design Notes Protection Application The
maximum bus voltage for a RS-485 link is 12V and
-7 V with a maximum data rate of 10 Mbps. Since
this is a relatively low-speed system, the
protection load capacitance is not a relative
concern. The signal lines to be protected from
the three threats identified below are the A B
signal lines. Solution Description As shown at
the bottom left, three discrete SIDACtor devices
(P0300Q22L) in either QFN packages or DO-214
packages can be used for a minimum PCB footprint
solution when surge is the primary threat. The
SM712-02HTG shown at the upper left was designed
specifically for RS-485 consisting of 2 channels
with a 12V and 7V standoff voltage in the
positive and negative direction, respectively,
and should be used when ESD and low level surge
is the primary threat. Regulatory Issues The
IEC 61000-4-2 (ESD Immunity), 4-4 (EFT Immunity),
4-5 (surge immunity) are the three most common
standards that a RS-485 interface must withstand.
Unique Features SIDACtor crowbarring
technology. Companion Solutions P0300Q12AL,
P0300SAL
37
Circuit Protection of a CAN/LIN Bus
Design Notes Protection Application Most
applications involve two wires (i.e. CANH and
CANL) and depending on cable length, data rates
can vary from 10kbps-1Mbps The common mode
voltage can differ in the particular application
from -2V to 7V or up to -12V to 12V. The latter
case is shown to the left where we assume the
full signal swing is 24V. Solution Description
The SM24CANA and SM24CANB can withstand up to 24V
in either direction (i.e. bidirectional) and
should be used for ESD and low level surge
suppression. Regulatory Issues The IEC
61000-4-2 (ESD Immunity), 4-4 (EFT Immunity),
4-5 (surge immunity) are the most common
standards that will apply and both products are
AEC-Q101 qualified for automotive applications.
Unique Features Does not apply. Companion
Solutions Discrete options like the SDxx and
SDxxC Series can be considered as alternatives
and are also AEC-Q101 qualified.
Potential Solutions
Ordering Number Surge (tP8/20µs) ESD Level I/O Capacitance Channels VRWM Packaging
SM24CANA-02HTG 3A 24kV 11pF 2 24V SOT23-3
SM24CANB-02HTG 10A 30kV 30pF 2 24V SOT23-3
38
Circuit Protection of a SIM or µSIM Socket
Design Notes Protection Application The SIM
(Subscriber Identification Module) card has 3
data lines that are medium-speed and low-voltage.
Given the low speed of the signals, the
capacitance is not a major concern. Solution
Description The SP1011 and SP1012 are ideal form
factors for this socket measuring 1.25x1mm and
0.94x0.6mm, respectively. Regulatory Issues
The IEC 61000-4-2 (ESD Immunity) is the main
focus as the biggest threat is ESD from the
removal and replacing of SIM cards. Unique
Features Does not apply. Companion Solutions
Other solutions and form factors in the TVS Diode
Array portfolio exist.
Potential Solutions
Ordering Number ESD Level Line Capacitance _at_ VR2.5V Channels VRWM Packaging
SP1011-04UTG 15kV 7pF 4 6V µDFN-6
SP1012-05WTG 15kV 6.5pF 5 6V Flipchip
SP3022-01xTG 20kV 0.35pF 1 5V SOD882 0201 Flipchip
39
  • Telecommunication
  • Applications/Interfaces

40
Central Office (CO) Block Diagram
Overview Notes Central Office (CO) This
connects the Public Switched Telephone Network
(PSTN) to the customer through a SLIC function.
This CO also connects the customer to the
internet via the VDSL2/ADSL2 transceiver unit.
This CO Site could be a Remote Terminal (RT)
located in a neighborhood or it could be a
building location up to 18,000 feet away. The
further a customer is from this CO function, the
lower the xDSL rate will be. LF has solutions
targeted for the SLIC, Transceiver Units and the
splitter at this CO location. A CO will also
contain T1/E1/J1 trunks, which LF presents
solutions for also. Remote Site Customer
Premises Equipment (CPE) The customer premises
in this diagram shows the Plain Old Telephone
Service (POTS), better known as voice services,
along with xDSL services. A splitter function
will also be located at the CP site. LF has
solutions for the POTS interface, the splitter,
and the xDSL transceiver unit.
41
POTS Circuit Protection
Design Notes Protection Application POTS
interfaces such as telephones, fax machines, and
56k modems need protection from lightning induced
surges. Solution Description Generally this
interface will require the P3100 or P3500 due to
battery voltage and ringing signals. In some
applications, lower threshold devices may be
appropriate. Companion Solutions The A rated
version may be used if a PPTC is placed out front
instead of the TeleLink fuse. These solutions
are available in QFN, DO-214, and TO-92
packages. Regulatory Issues The most typical
requirement for POTS type interfaces is TIA-968-B
and CS03, which is the Canadian version of
TIA-968. This was formerly known as FCC Part 68.
The ITU K.21 Recommendation would be applicable
for non- N.A. applications while the YD/T 1082
would apply for Mainland China. Verizon
requirements for CPE are more robust for this
interface so a C rated solution is required.
Many of these applications will also be UL listed
for safety so UL 60950-1 will apply for
N.A. Road Map Products to be Watching for Does
not apply
P3100 and TeleLink fuse
Potential Solutions
42
POTS Circuit Protection
P3100Sx and P0640Sx
This could be an analog modem interface,
telephone interface, or a fax machine interface
application.
43
ADSL2/VDSL2 Circuit Protection Inter-building
(per GR-1089) Protection Scheme
Design Notes Protection Application The
VDSL2/ADSL2 broadband signals can extend up to a
30 MHz bandwidth therefore, capacitance loading
is very important in these applications. VDSL2
can have signals as high as 29 volts p-p that are
superimposed on battery voltage and ringing
voltage for a combination POTS/DSL service line.
Therefore, a high threshold SIDACtor device is
typically selected.. Solution Description The
SDP3100Q38CB is a biased solution that does NOT
interfere with the DSL signaling scheme and
avoids the inter-modulation distortion issues for
most solid-state solutions offered in this slot.
A low off-state resistance PPTC can be used
preceding it for ITU K.20 and K.21
Recommendations.. Regulatory Issues These xDSL
ports and protection scheme should comply with
the Inter-building requirements of GR-1089 for
N.A. applications. Internationally, the
application should comply with ITU K.20 or K.21
Recommendation and in Mainland China with YD/T
993 or YD/T 950 or YD/T 1082. The UL/IEC/EN
60950-1 standards will generally demand the need
for the TeleLink or PTC.
SDP3100Q38CB and TeleLink PPTC
Potential Solutions
44
ADSL2/VDSL2 Circuit Protection Intra-building
(per GR-1089) Protection Scheme
Design Notes Protection Application The
VDSL2/ADSL2 broadband signals can extend up to a
30 MHz bandwidth therefore, capacitance loading
is very important in these applications. VDSL2
can have signals as high as 29 volts p-p that are
superimposed on battery voltage and ringing
voltage for a combination POTS/DSL service line.
Therefore, a high threshold SIDACtor device is
typically selected.. Solution Description The
SDP3100Q38CB is a biased solution that does NOT
interfere with the DSL signaling scheme and
avoids the inter-modulation distortion issues for
most solid-state solutions offered in this slot.
A low off-state resistance PPTC can be used
preceding it for ITU K.20 and K.21
Recommendations.. Regulatory Issues These xDSL
ports and protection scheme should comply with
the Intra-building requirements of GR-1089 for
N.A. applications. Internationally, the
application should comply with ITU K.20 or K.21
Recommendation and in Mainland China with YD/T
993 or YD/T 950 or YD/T 1082. The UL/IEC/EN
60950-1 standards will generally demand the need
for the TeleLink or PTC.
Potential Solutions
45
DSL Splitter Circuit Protection
P3100Q12B/SB, P0300SA/Q12A and TeleLink Fuse
Design Notes Protection Application This
circuit provides a high pass filter design for
the CPE side of an ADSL application. It provides
isolation between the voice channel of the POTS
line and the data channel intended for the ADSL
modem. Solution Description The P3100Q38B is a
non-biased solution but is compatible with many
lower rate DSL services or DSL services with very
short reach requirements. A low off-state
resistance PPTC can be used preceding it for ITU
K.20 and K.21 Recommendations.. Regulatory
Issues These xDSL splitters should comply with
the Intra-building or the Inter-building
requirements of GR-1089 for N.A. applications.
Internationally, the application should comply
with ITU K.20 or K.21 Recommendation and in
Mainland China with YD/T 993 or YD/T 950 or YD/T
1082. The UL/IEC/EN 60950-1 standards will
generally demand the need for the TeleLink or PTC.
Potential Solutions
Ordering Number VS _at_ 100V/us (VMAX) VRDM _at_ IDRM5uA (VMIN)
P0300SCLRP 40 25
P0300SAMCLRP 40 25
P3100SBLRP 350 275
P3500SBLRP 400 320
P0300Q12BLRP 40 25
P0300Q12ALRP 40 25
P3100Q12BLRP 350 275
P3500Q12BLRP 400 320
46
SLIC/FXO/FXS VoIP Overview
Overview Notes VoIP A VoIP (voice over IP)
application will utilize a SLIC function to
provide the analog interface to the telephone, an
Ethernet port for data and/or digitized voice
connections to specialized data phones, and an
FXO (Foreign eXchange Office) port to interface
with the Public Switched Telephone Network
(PSTN) In CPE, the FXS circuit is located in the
gateway. This specific block diagram includes
the FXO port, which provides lifeline support,
call congestion handling (if the packet network
via the Ethernet port is not available), and
remote VoIP dialing (i.e. receiving calls through
the analog PSTN port and forwarding them to the
VoIP network). Not all VoIP applications will
contain an FXO port. Some rely solely on the
packet network connection via the Ethernet port.
47
SLIC Circuit Protection
Design Notes Protection Application The SLIC
chipset provides the dial tone, battery voltage,
ringing voltages, and other interfacing functions
between the end user and the telcom network. Many
variants of SLIC chipsets are offered in the
market place. . Solution Description This is a
fixed voltage protector that does NOT require an
additional capacitor as the programmable
protectors require. The surge rating of this
device is lower than the programmable devices
therefore, it is generally used with a leading
PTC device and is intended mainly for
intra-building applications. Companion
Solutions.Pxxx1DF-1, Pxxx1UAL/UCL, Pxxx1Q22CL,
Pxxx1CA2L, Pxxx1SAL/SCL, Regulatory Issues
These SLIC ports should comply with the
Intra-building or the Inter-building requirements
of GR-1089 for N.A. applications.
Internationally, the application should comply
with ITU K.20 or K.21 Recommendation and in
Mainland China with YD/T 993 or YD/T 950 or YD/T
1082. The UL/IEC/EN 60950-1 standards will
generally demand the need for the TeleLink or
PTC.
P0721DF-1E and 600R150 PPTC
Potential Solutions
48
SLIC Circuit Protection
Design Notes Protection Application The SLIC
chipset provides the dial tone, battery voltage,
ringing voltages, and other interfacing functions
between the end user and the telcom network. Many
variants of SLIC chipsets are offered in the
market place. . Solution Description This
dual-channel ProSLIC chipset is a self-ringing
SLIC, which means it internally generates the
ringing signal. The OVP solution shown will
track with the reference voltage of this
self-ringing SLIC. This solution also includes
the integrated diode for positive surge
protection. Companion Solutions B1101UC4 (one
package instead of two packages as shown to the
left), 600R150 PPTC, Regular TeleLink fuse,
B1xxCAL/CCL.. Regulatory Issues These SLIC
ports should comply with the Intra-building or
the Inter-building requirements of GR-1089 for
N.A. applications. Internationally, the
application should comply with ITU K.20 or K.21
Recommendation and in Mainland China with YD/T
993 or YD/T 950 or YD/T 1082. The UL/IEC/EN
60950-1 standards will generally demand the need
for the TeleLink or PTC.
B1101UCL and TeleLink Fuse
Potential Solutions
49
SLIC Circuit Protection
Design Notes Protection Application The SLIC
chipset provides the dial tone, battery voltage,
ringing voltages, and other interfacing functions
between the end user and the telcom network. Many
variants of SLIC chipsets are offered in the
market place. . Solution Description This is a
two chipset self-ringing SLIC. The OVP solution
shown will track with the reference voltage of
this self-ringing SLIC. A single protection
package for two SLIC chipsets results in a lower
cost since only one reference capacitor is
required. This solution also includes the
integrated diode. Companion Solutions B1101UC
(two packages instead of a single package
solution as shown to the left, which may offer
more PCB layout options), 600R150 PPTC, Regular
TeleLink fuse, B1xxxCAL/CCL(but extra diode
needed). Regulatory Issues These SLIC ports
should comply with the Intra-building or the
Inter-building requirements of GR-1089 for N.A.
applications. Internationally, the application
should comply with ITU K.20 or K.21
Recommendation and in Mainland China with YD/T
993 or YD/T 950 or YD/T 1082. The UL/IEC/EN
60950-1 standards will generally demand the need
for the TeleLink or PTC.
B1101UC4L and Enhanced TeleLink Fuse
Potential Solutions
50
SLIC LCAS Circuit Protection
Design Notes Protection Application The SLIC
chipset provides the dial tone, battery voltage,
ringing voltages, and other interfacing functions
between the end user and the telcom network. The
LCAS provides the ringing signal so that a
self-ringing SLIC is not required. Solution
Description This is a fixed voltage protector
that does NOT require an additional capacitor as
the programmable protectors require. It also
includes an asymmetrical SIDACtor device to
protect the LCAS relay (.different turn on
voltages tip to ground then ring to ground).
Companion Solutions.Pxxx1DF-1E, Pxxx1DF-1,
Pxxx1UAL/UCL, Pxxx1Q22CL, Pxxx1CA2L, Pxxx1SCL,
600R150. Regulatory Issues These SLIC ports
should comply with the Intra-building or the
Inter-building requirements of GR-1089 for N.A.
applications. Internationally, the application
should comply with ITU K.20 or K.21
Recommendation and in Mainland China with YD/T
993 or YD/T 950 or YD/T 1082. The UL/IEC/EN
60950-1 standards will generally demand the need
for the TeleLink or PTC.
P0641SAL, A1220UAL and TeleLink Fuse
Potential Solutions
51
DS-1 Overview
Overview Notes DS-1 The DS-1 interface is
known as a T1 trunk line in N.A., as a J1 trunk
line in Japan, and as an E1 trunk line in the
remaining parts of the globe. This is a four-wire
system with a TX pair and a RX pair used for data
rates up to 1.544 Mbps for non-E1 and 2.058 Mbps
for E1 and J1 trunk lines. The signaling voltage
is typically 2.4 volts to 3.6 volts but due to
imbalances in the line, signal reflections can
occur, which could cause the signals to be as
high as 12 volts. This sets the minimum
threshold for the protection devices. However,
for systems that are repeatered (regenerator term
is actually the correct term), phantom powering
is used. This is normally 130 volts
therefore, the minimum turn-on for OVP needs to
be much higher. Furthermore, TIA-968-A (soon to
be TIA-968-B) requires an insulation barrier, so
any OVP connected longitudinally (common mode)
must have a stand-off voltage greater than 169
volts. The P1800 series fits this perfectly.
52
DS1 (T1/E1/J1) Trunk Circuit Protection
P0080Q12AL, P3206UCL and the TeleLink Fuse
Design Notes Protection Application A DS1 port
has several nomenclatures used in the telcom
industry. The T1 trunk is a 1.544 Mbps baseband
connection used in North America, while the E1 is
a 2.0 Mbps connection used in the rest of the
world except for Japan, where the term is J1.
The data signal is very low but IF a regenerator
system is used, then higher threshold surge
suppression is required. Solution Description
The line side of this port will require a robust
solution while the chip-side can implement lower
surge rated protection. The TeleLink fuse is
compatible with this baseband signaling scheme
and is necessary for the application to comply
with power fault conditions. Companion
Solutions.A2106UCL, P2106UCL, P1800Q22CL,
P0640Q22CL, 600R150, P1800SDL Regulatory Issues
N.A. ports will typically need to comply with
GR-1089 (Issue 6), TIA-968-B in some cases, and
UL 60950-1. European and other non-Mainland China
installations will need to comply with ITU K.20
and IEC 60950-1. Mainland China installations
will need to comply with YD/T 1082 or YD/T 950.
ports Some customers may ask for compliance to
he IEC 61000-4-5.
P1800SDL and the PPTC
P1800Q22C, SP03-6 and the PPTC
53
DS3 (T3/E3/J3) Trunk Circuit Protection
Design Notes Protection Application The
signals used in an DS3 application are low but
the data rate is 45 Mbps. Therefore a low
capacitance protection solution is needed for
these applications . Solution Description A
DS3 interface is typically an intra-building
application, so the A rated device will
suffice. The entire list of A devices shown
in the possible solutions below are also
available in a B rating for more robust surge
requirements. Regulatory Issues For
intra-building applications, the GR-1089
intra-building requirements, ITU K.20 or K.21
Basic Recommendations apply. . From a safety
perspective, UL/EN/IEC 60950-1 would apply.
P0642SAL and Fuse
Potential Solutions
54
DS3/DS4/DS5 (Tx/Ex/Jx) Trunk Circuit Protection
Design Notes Protection Application T-carrier
infers NA and South KR while E- carrier infers
Europe and J-carrier for Japan. DS2 T2
(6Mbps), E2 (8Mbps), J2 (6Mbps) DS3 T3
(44Mbps), E3 (34Mbps), J3 (32Mbps) DS4 T4
(274Mbps), E4 (139Mbps), J4 (97Mbps) DS5 T5
(400Mbps), E5 (565Mbps), J5 (565Mbps) The data
rates go up with each successive version and
hence the importance of using lower capacitance
solutions. Solution Description The line side
of this port will require a robust solution while
the chip-side can implement lower surge rated
protection. The key is to use lower capacitance
devices like the LC03 and SP3051 TVS Diode
Arrays. The TeleLink fuse is compatible with this
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