description

The TISP2290 is designed specifically for

telephone equipment protection against lightning

and transients induced by a.c. power lines.

These devices will supress voltage transients

between terminals A and C, B and C, and A and

B.

Transients are initially clipped by zener action

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 transient subsides.

These monolithic protection devices are

fabricated in ion-implanted planar structures to

ensure precise and matched breakover control

and are virtually transparent to the system in

normal operation.