SR2.8 Semtech, SR2.8 Datasheet

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SR2.8

Manufacturer Part Number
SR2.8
Description
Manufacturer
Semtech
Datasheet

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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.
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.
Revision 01/17/08
PROTECTION PRODUCTS
During transient conditions, the steering diodes direct
Description
Circuit Diagram
Pin 2
Pin 4
Pin 1
Pin 3
1
Low Capacitance TVS Diode Array
Features
Mechanical Characteristics
Applications
Schematic & PIN Configuration
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
Protects two I/O lines
Low capacitance (<10pF) for high-speed interfaces
Low leakage current (< 1µA)
Low operating voltage: 2.8V
Solid-state technology
JEDEC SOT-143 package
Molding compound flammability rating: UL 94V-0
Marking : R2.8
Packaging : Tape and Reel
Firewire
Sensitive Analog Inputs
Video Line Protection
Portable Electronics
Microcontroller Input Protection
WAN/LAN Equipment
diode
1
2
SOT-143 (Top View)
4
3
RailClamp
www.semtech.com
SR2.8

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SR2.8 Summary of contents

Page 1

... 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 Schematic & PIN Configuration 1 2 SOT-143 (Top View) 1 SR2.8 RailClamp 4 3 www.semtech.com ...

Page 2

... PROTECTION PRODUCTS Absolute Maximum Rating µ µ Electrical Characteristics 2008 Semtech Corp µ µ ° µ µ www.semtech.com SR2 ° C ° C ° µ ...

Page 3

... Forward Current - I 2008 Semtech Corp. 110 100 100 1000 (µs) p Clamping Voltage vs. Peak Pulse Current W aveform 20 Parameters 8µ 20µ Waveform Parameters 8µ 20µ ( SR2.8 Power Derating Curve 100 125 o Ambient Temperature - Waveform Parameters 8µ 20µ Peak Pulse Current - I (A) PP www.semtech.com 150 20 ...

Page 4

... High-Speed Data Lines o High-Speed Data Lines o High-Speed Data Lines o High-Speed Data Lines The SR2.8 TVS is designed to protect two data lines from transient over-voltages by clamping them to a fixed reference. When the voltage on the protected line exceeds the reference voltage (plus diode V steering diodes are forward biased, conducting the transient current away from the sensitive circuitry ...

Page 5

... Minimize the path length between the SR3.3 and the protected line. Place the SR2.8 near the connector to restrict transient coupling in nearby traces. Minimize the path length (inductance) between the RJ45 connector and the SR2.8. ...

Page 6

... COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A. 2008 Semtech Corp. H GAUGE PLANE SEATING PLANE 0. DETAIL SIDE VIEW A ccc C 4X SEATING PLANE C - SR2.8 DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN .031 A .048 0.80 - .000 A1 .006 0.013 A2 .029 .035 .042 0. .011 .020 0.30 ...

Page 7

... PROTECTION PRODUCTS Marking Codes Ordering Information Contact Information Phone: (805)498-2111 FAX (805)498-3804 2008 Semtech Corp Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 7 SR2.8 www.semtech.com ...

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