TISP4070H3LM Datasheet | Power Innovations Limited

description These devices are designed to limit overvoltages on the telephone line. Overvoltages are normally caused by a.c. power system or lightning flash disturbances which are induced or conducted on to the telephone line. A single device provides 2-point protection and is typically used for the protection of 2-wire telemunication equipment (e.g. between the Ring to Tip wires for telephones and modems). binations of devices can be used for multi-point protection (e.g. 3-point protection between Ring, Tip and Ground). The protector consists of a symmetrical voltage-triggered bidirectional thyristor. Overvoltages are initially clipped by breakdown clamping until the voltage rises to the breakover level, which causes the device to crowbar into a low-voltage on state. This low-voltage on state causes the current resulting from the overvoltage to be safely diverted through the device. The high crowbar holding current prevents d.c. latchup as the diverted current subsides. PRODUCT INFORMATION Information is current as of publication date. Products conform to specifications in accordance with the terms of Power Innovations standard warranty. Production processing does not necessarily include testing of all parameters. TISP4070H3LM THRU TISP4095H3LM, TISP4125H3LM THRU TISP4220H3LM, TISP4240H3LM THRU TISP4400H3LM BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS NOVEMBER 1997 - REVISED APRIL 1999 description (continued) This TISP4xxx H3LM range consists of thirteen voltage variants to meet various maximum system voltage levels (58 V to 300...