SR2.8 RailClamp Low Capacitance TVS Diode Array PROTECTION PRODUCTS Features Description ESD protection to RailClamps are surge rated diode arrays designed to IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) protect high speed data interfaces. The SR series has IEC 61000-4-4 (EFT) 40A (5/50ns) been specifically designed to protect sensitive compo- IEC 61000-4-5 (Lightning) 12A (8/20s) nents which are connected to data and transmission lines from overvoltage caused by electrostatic dis- Array of surge rated diodes with internal charge (ESD), electrical fast transients (EFT), and EPD TVS diode tertiary lightning. Protects two I/O lines Low capacitance (<10pF) for high-speed interfaces The unique design of the SR series devices incorpo- rates four surge rated, low capacitance steering Low leakage current (< 1A) diodes, and a TVS diode in a single package. The TVS Low operating voltage: 2.8V diode is constructed using Semtechs proprietary low Solid-state technology voltage EPD technology for superior electrical charac- Mechanical Characteristics teristics at 2.8 volts. JEDEC SOT-143 package During transient conditions, the steering diodes direct Molding compound flammability rating: UL 94V-0 the transient to either the positive side of the power supply line or to ground. The internal TVS diode pre- Marking : R2.8 vents over-voltage on the power line, protecting any Packaging : Tape and Reel downstream components. Applications The low capacitance array configuration allows the user Firewire to protect two high-speed data or transmission lines. The low inductance construction minimizes voltage Sensitive Analog Inputs overshoot during high current surges. Video Line Protection Portable Electronics Microcontroller Input Protection WAN/LAN Equipment Circuit Diagram Schematic & PIN Configuration Pin 4 4 1 Pin 2 Pin 3 2 3 Pin 1 SOT-143 (Top View) www.semtech.com Revision 01/17/08 1SR2.8 PROTECTION PRODUCTS Absolute Maximum Rating Rlating Seymbo Vsalu Unit PPeak Pulse Power (tp = 8/20s) 2s00 Watt pk PIeak Pulse Current (tp = 8/20s) 1A4 PP Peak Forward Voltage (I=V1A, tp=8/20s) 1V.5 F FP LTead Soldering Temperature 2C60 (10 sec.) L OTperating Temperature -C55 to +125 J STtorage Temperature -C55 to +150 STG Electrical Characteristics SR2.8 Plarameter SsymboCmondition MlinimuTmypicaMsaximu Unit RVeverse Stand-Off Voltage 2V.8 RWM PVunch-Through Voltage I=02A3V. PT PT SVnap-Back Voltage I=850mA2V. SB SB RIeverse Leakage Current V=12.8V, T=25C A R RWM CVlamping Voltage I=01A, tp = 8/20s 5V. C PP CVlamping Voltage I=55A, tp = 8/20s 8V. C PP JCunction Capacitance Between I/O pins and 601Fp j Ground V = 0V, f = 1MHz R Between I/O pins 3Fp V = 0V, f = 1MHz R www.semtech.com 2008 Semtech Corp. 2