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SRDA3.3-4 Datasheet, PDF (1/8 Pages) Semtech Corporation – RailClamp® Low Capacitance TVS Array | |||
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PROTECTION PRODUCTS - RailClamp®
Description
RailClamps are surge rated diode arrays designed to
protect high speed data interfaces. The SRDA series
has been specifically designed to protect sensitive
components which are connected to data and trans-
mission lines from overvoltage caused by electrostatic
discharge (ESD), electrical fast transients (EFT), and
lightning.
The unique design incorporates surge rated, low
capacitance steering diodes and a TVS diode in a
single package. During transient conditions, the
steering diodes direct the transient current to ground
via the internal low voltage TVS. The TVS diode clamps
the transient voltage to a safe level. The low capaci-
tance array configuration allows the user to protect up
to four high-speed data lines.
The SRDA3.3-4 is constructed using Semtechâs
proprietary EPD process technology. The EPD process
provides low stand-off voltages with significant reduc-
tions in leakage current and capacitance over silicon-
avalanche diode processes. They feature a true
operating voltage of 3.3 volts for superior protection.
These devices are in a 8-pin SOIC package. It mea-
sures 3.9 x 4.9mm. They are available with a SnPb or
RoHS/WEEE compliant matte tin lead finish. The high
surge capability (Ipp=25A, tp=8/20μs) means it can be
used in high threat environments in applications such
as CO/CPE equipment, telecommunication lines, and
video lines.
SRDA3.3-4
RailClamp®
Low Capacitance TVS Array
Features
 Transient protection for high-speed data lines to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 24A (8/20μs)
 Array of surge rated diodes with internal TVS diode
 Protects four I/O lines
 Low capacitance (<15pF) for high-speed interfaces
 Low operating voltage: 3.3V
 Low clamping voltage
 Solid-state technology
Mechanical Characteristics
 JEDEC SOIC-8 package
 Lead Finish: SnPb or Matte Sn
 Molding compound flammability rating: UL 94V-0
 Marking : Part number, date code, logo
 Packaging : Tape and Reel per EIA 481
Applications
 T1/E1 secondary IC Side Protection
 T3/E3 secondary IC Side Protection
 Analog Video Protection
 Microcontroller Input Protection
 Base stations
 I2C Bus Protection
Circuit Diagram
Schematic and PIN Configuration
2, 3
I/O 1
I/O 2
I/O 3
I/O 4
5, 8
I/O 1 1
NC 2
NC 3
I/O 2 4
Revision 01/15/08
1
8 GND
7 I/O 4
S0-8 (Top View)
6 I/O 3
5 GND
www.semtech.com
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