TISP1072F3

These dual asymmetrical transient voltage suppressors TISP1072F3 are designed for the overvoltage protection of ICs used for the SLIC (Subscriber Line Interface Circuit) function. The IC line driver section is typically powered with 0 V and a negative supply. The TISP1xxxF3 limits voltages that exceed these supply rails and is offered in two voltage variants to match typical negative supply voltage values.

High voltages can occur on the line as a result of exposure to lightning strikes and a.c. power surges. TISP1072F3 Negative transients are initially limited by breakdown clamping until the voltage rises to the breakover level, which causes the device to crowbar. The high crowbar holding current prevents d.c. latchup as the current subsides. Positive transients are limited by diode forward conduction. These protectors are guaranteed to suppress and withstand the listed international lightning surges on any terminal pair

These monolithic protection devices TISP1072F3 are fabricated in ion-implanted planar structures to ensure precise and matched breakover control and are virtually transparent to the system in normal operation

The small-outline 8-pin assignment TISP1072F3 has been carefully chosen for these devices to maximise the inter-pin clearance and creepage distances which are used by standards (e.g. IEC950) to establish voltage withstand ratings.