The TISP61089B is a dual forward-conducting buffered p-gate thyristor (SCR) overvoltage protector. It is designed to protect monolithic SLICs (Subscriber Line Interface Circuits) against overvoltages on the telephone line caused by lightning, a.c. power and ringing voltage.
The TISP61089B is a dual forward‑conducting buffered p‑gate thyristor (SCR) designed to protect monolithic SLICs (Subscriber Line Interface Circuits) from over‑voltages caused by lightning, AC power contact and induction. It limits voltages that exceed the SLIC supply rail and complies with Bellcore GR‑1089‑CORE and ITU‑T K.20, K.21, K.45 recommendations.
The device is supplied in an 8‑pin plastic small‑outline (D) package and is intended for use with a series resistor (minimum 10 Ω for 400 V GDT coordination). It supports battery voltages down to –155 V, with a low 5 mA maximum gate trigger current and a minimum 150 mA holding current. Detailed electrical, thermal and application specifications are provided.
| Off‑state voltage (VDRM) | -170 V |
|---|---|
| Holding current (I_H) | 150 mA min |
| Gate trigger current (I_GT) | 5 mA |
| Supported battery voltage | Down to –155 V |
| Package | 8‑pin Small‑Outline (D) |
The device supports battery voltages down to –155 V.
A minimum series resistor value of 10 Ω is recommended.
The minimum gate trigger current is 5 mA.
The device requires a minimum holding current of 150 mA.