SR2.8 Datasheet, PDF (1/7 Pages) Semtech Corporation – RailClamp® Low Capacitance TVS Diode Array

PROTECTION PRODUCTS
Description
RailClamps are surge rated diode arrays designed to
protect high speed data interfaces. The SR series has
been specifically designed to protect sensitive compo-
nents which are connected to data and transmission
lines from overvoltage caused by electrostatic dis-
charge (ESD), electrical fast transients (EFT), and
tertiary lightning.
The unique design of the SR series devices incorpo-
rates four surge rated, low capacitance steering
diodes, and a TVS diode in a single package. The TVS
diode is constructed using Semtech’s proprietary low
voltage EPD technology for superior electrical charac-
teristics at 2.8 volts.
During transient conditions, the steering diodes direct
the transient to either the positive side of the power
supply line or to ground. The internal TVS diode pre-
vents over-voltage on the power line, protecting any
downstream components.
The low capacitance array configuration allows the user
to protect two high-speed data or transmission lines.
The low inductance construction minimizes voltage
overshoot during high current surges.
SR2.8
RailClamp^
Low Capacitance TVS Diode Array
Features
‹ ESD protection to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 12A (8/20µs)
‹ Array of surge rated diodes with internal
EPD TVS diode
‹ Protects two I/O lines
‹ Low capacitance (<10pF) for high-speed interfaces
‹ Low leakage current (< 1µA)
‹ Low operating voltage: 2.8V
‹ Solid-state technology
Mechanical Characteristics
‹ JEDEC SOT-143 package
‹ Molding compound flammability rating: UL 94V-0
‹ Marking : R2.8
‹ Packaging : Tape and Reel
Applications
‹ Firewire
‹ Sensitive Analog Inputs
‹ Video Line Protection
‹ Portable Electronics
‹ Microcontroller Input Protection
‹ WAN/LAN Equipment
Circuit Diagram
Pin 4
Pin 2
Pin 3
Revision 01/17/08
Pin 1
Schematic & PIN Configuration
4
1
2
3
SOT-143 (Top View)
1
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