SRDA3.3-4 RailClamp Low Capacitance TVS Array PROTECTION PRODUCTS PROTECTION PRODUCTS - RailClamp Features Description RailClamps are surge rated diode arrays designed to Transient protection for high-speed data lines to protect high speed data interfaces. The SRDA series IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) has been specifically designed to protect sensitive IEC 61000-4-4 (EFT) 40A (5/50ns) components which are connected to data and trans- IEC 61000-4-5 (Lightning) 24A (8/20 s) mission lines from overvoltage caused by electrostatic Array of surge rated diodes with internal TVS diode discharge (ESD), electrical fast transients (EFT), and Protects four I/O lines lightning. Low capacitance (<15pF) for high-speed interfaces The unique design incorporates surge rated, low Low operating voltage: 3.3V capacitance steering diodes and a TVS diode in a Low clamping voltage single package. During transient conditions, the Solid-state technology steering diodes direct the transient current to ground Mechanical Characteristics via the internal low voltage TVS. The TVS diode clamps the transient voltage to a safe level. The low capaci- JEDEC SOIC-8 package tance array configuration allows the user to protect up Lead Finish: SnPb or Matte Sn to four high-speed data lines. Molding compound flammability rating: UL 94V-0 The SRDA3.3-4 is constructed using Semtechs Marking : Part number, date code, logo proprietary EPD process technology. The EPD process Packaging : Tape and Reel per EIA 481 provides low stand-off voltages with significant reduc- tions in leakage current and capacitance over silicon- Applications avalanche diode processes. They feature a true operating voltage of 3.3 volts for superior protection. T1/E1 secondary IC Side Protection T3/E3 secondary IC Side Protection These devices are in a 8-pin SOIC package. It mea- Analog Video Protection sures 3.9 x 4.9mm. They are available with a SnPb or RoHS/WEEE compliant matte tin lead finish. The high Microcontroller Input Protection surge capability (Ipp=25A, tp=8/20 s) means it can be Base stations 2 used in high threat environments in applications such I C Bus Protection as CO/CPE equipment, telecommunication lines, and video lines. Circuit Diagram Schematic and PIN Configuration I/O 1 1 8 GND 2, 3 NC 2 7 I/O 4 I/O 1 I/O 2 I/O 3 I/O 4 3 6 NC I/O 3 5, 8 45 GND I/O 2 S0-8 (Top View) www.semtech.com Revision 01/15/08 1SRDA3.3-4 PROTECTION PRODUCTS PROTECTION PRODUCTS Absolute Maximum Rating Rlating Seymbo Vsalu Unit Peak Pulse Power (t=P8/20s) 5s00 Watt p pk Peak Pulse Current (t=I8/20s) 2A5 p PP LTead Soldering Temperature 2C60 (10 sec.) L OTperating Temperature -C40 to +85 J STtorage Temperature -C55 to +150 STG o Electrical Characteristics (T=25 C) SRDA3.3-4 Plarameter SsymboCmondition MlinimuTmypicaMsaximu Unit RVeverse Stand-Off Voltage 3V.3 RWM PVunch-Through Voltage I=52A3V. PT PT SVnap-Back Voltage I=850mA2V. SB SB RIeverse Leakage Current V=13.3V, T=25C A R RWM CVlamping Voltage I = 1A, t=38/20s 5V. C PP p CVlamping Voltage I = 10A, t=08/20s 1V C PP p CVlamping Voltage I = 25A, t=58/20s 1V C PP p JCunction Capacitance Between I/O pins and 851Fp j Ground V = 0V, f = 1MHz R Between I/O pins 4Fp V = 0V, f = 1MHz R www.semtech.com 2008 Semtech Corp. 2