SR70 RailClamp Low Capacitance TVS Diode Array PROTECTION PRODUCTS Features Description RailClamps are surge rated diode arrays designed to Transient protection for high speed data lines to protect high speed data interfaces. The SR70 has IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) been specifically designed to protect sensitive compo- IEC 61000-4-4 (EFT) 40A (5/50ns) nents which are connected to data and transmission IEC 61000-4-5 (Lightning) 1kV, 24A (8/20s) lines from over-voltages caused by ESD (electrostatic Array of surge rated, low capacitance diodes discharge), EFT (electrical fast transients), and light- Protects two I/O lines ning. The SR70 has been optimized for use on ADSL Low capacitance (5pF typical) for high-speed and other high-speed interfaces. interfaces The unique design of the SR70 integrates four surge Low clamping voltage rated, low capacitance steering diodes in a low profile Solid-state silicon-avalanche technology SOT-143 package. It has a typical capacitance of only 5pF and may be used to protect two high-speed lines Mechanical Characteristics without sacrificing signal integrity. The SR70 is de- JEDEC SOT-143 package signed to replace standard rectifiers that are not UL 497B listed rated for the high energy surges that are normally Molding compound flammability rating: UL 94V-0 expected in telecommunications applications. Marking : R70 During transient conditions, the steering diodes direct Packaging : Tape and Reel per EIA 481 the transient to either the positive side of the power supply line or to ground. The maximum clamping Applications voltage seen by the protected circuit will be one diode ADSL Lines drop (V ) above the supply (reference) voltage. The F 2 SR70 may be used as a stand alone device or in I C Bus Protection conjunction with TVS diodes for enhanced protection. Video Line Protection T1/E1 secondary IC Side Protection Portable Electronics Microcontroller Input Protection WAN/LAN Equipment ISDN S/T Interface Circuit Diagram Schematic & PIN Configuration Pin 4 4 1 Pin 2 Pin 3 23 Pin 1 SOT-143 (Top View) www.semtech.com Revision 04/18/03 1SR70 PROTECTION PRODUCTS Absolute Maximum Rating Rlating Seymbo Vsalu Unit Peak Pulse Current (t=I8/20s) 2A4 p PP RVectifier Repetitive Peak Reverse Voltage 7V0 RRM ESD per IEC 61000-4-2 (Air) V 15 kV ESD ESD per IEC 61000-4-2 (Contact) 8 LTead Soldering Temperature 2C60 (10 sec.) L OTperating Temperature -C55 to +125 J STtorage Temperature -C55 to +150 STG o Electrical Characteristics (T=25 C) SR70 Plarameter SsymboCmondition MlinimuTmypicaMsaximu Unit PVeak Reverse Stand-Off Voltage 7V0 RRM RVeverse Breakdown Voltage I = 50A58V BR t RIeverse Leakage Current V=570V, T=25C A R RWM FVorward Clamping Voltage I = 1A, t=58/20s 1V. FC PP p FVorward Clamping Voltage I = 10A, t=38/20s 3V. FC PP p FVorward Clamping Voltage I = 24A, t=78/20s V FC PP p JCunction Capacitance Between I/O pins and 501Fp j Ground V = 0V, f = 1MHz R Between I/O pins 3Fp V = 0V, f = 1MHz R www.semtech.com 2003 Semtech Corp. 2