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BL758L Datasheet(PDF) 1 Page - Bourns Electronic Solutions |
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BL758L Datasheet(HTML) 1 Page - Bourns Electronic Solutions |
1 / 8 page TISPL758LF3D - INTEGRATED SYMMETRICAL AND ASYMMETRICAL BIDIRECTIONAL OVERVOLTAGE PROTECTORS FOR LUCENT TECHNOLOGIES L7581/2/3 LINE CARD ACCESS SWITCHES PRODUCT INFORMATION 1 JANUARY 1998 - REVISED AUGUST 2002 Specifications are subject to change without notice. OVERVOLTAGE PROTECTION FOR LUCENT TECHNOLOGIES LCAS q Symmetrical and Asymmetrical Characteristics for Optimum Protection of Lucent L7581/2/3 LCAS q Rated for International Surge Wave Shapes q Ion-Implanted Breakdown Region Precise And Stable Voltage Low Voltage Overshoot Under Surge q Planar Passivated Junctions Low Off-State Current < ±10 µA q Small Outline Surface Mount Package - Available Ordering Options description The TISPL758LF3 is an integrated combination of a symmetrical bidirectional overvoltage protector and an asymmetrical bidirectional overvoltage protector. It is designed to limit the peak voltages on the line terminals of the Lucent Technologies L7581/2/3 LCAS (Line Card Access Switches). An LCAS may also be referred to as a Solid State Relay, SSR, i.e. a replacement of the conventional electro- mechanical relay. The TISPL758LF3D voltages are chosen to give adequate LCAS protection for all switch conditions. The most potentially stressful TERMINAL PAIR VDRM V V(BO) V T-G (SYMMETRICAL) ±105 ±130 R-G (ASYMMETRICAL) +105, -180 +130, -220 CUSTOMISED VERSIONS AVAILABLE WAVE SHAPE STANDARD ITSP A 2/10 µs GR-1089-CORE 175 8/20 µs ANSI C62.41 120 10/160 µs FCC Part 68 60 10/700 µs ITU-T K20/21 50 10/560 µs FCC Part 68 45 10/1000 µs GR-1089-CORE 35 CARRIER ORDER # Tube TISPL758LF3D Taped and reeled TISPL758LF3DR condition is low level power cross when the LCAS switches are closed. Under this condition, the TISPL758LF3D limits the voltage and corresponding LCAS dissipation until the LCAS thermal trip operates and opens the switches. Under open-circuit ringing conditions, the line ring (R) conductor will have high peak voltages. For battery backed ringing, the ring conductor will have a larger peak negative voltage than positive i.e. the peak voltages are asymmetric. An overvoltage protector with a similar voltage asymmetry will give the most effective protection. On a connected line, the tip (T) conductor will have much smaller voltage levels than the open- circuit ring conductor values. Here a symmetrical voltage protector gives adequate protection. Overvoltages are normally caused by a.c. power system or lightning flash disturbances which are induced or conducted on to the telephone line. These overvoltages are initially clipped by protector breakdown clamping until the voltage rises to the breakover level, which causes the device symbol MDXXAE D PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 G G G G NC T R NC NC - No internal connection G T R SD3XAA Terminals T, R and G correspond to the alternative line designators of A, B and C Support from the Microelectronics Group of Lucent Technologies Inc. is gratefully acknowledged in the definition of the TISPL758LF3D voltage levels and for performing TISPL758LF3D evaluations. |
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