JULY 2010 - REVISED MAY 2012

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

MDRXAN

1

2

3

45

6

7

8

K2

A

A

K4

G1,G2

K1

K3

G3,G4

SDRXAIA

K1

K3

K4

K2

G3,G4

A

A

G1,G2

TISP61089QB SLIC Overvoltage Protector

TISP61089QB

PROGRAMMABLE OVERVOLTAGE PROTECTOR

QUAD FORWARD-CONDUCTING P-GATE THYRISTOR

Quad Voltage-Programmable Protector

- Wide -20 V to -155 V Programming Range

- Low 5 mA max. Gate Triggering Current

- High 150 mA min. Holding Current

- Rated for ITU-T and YD/T-950 10/700 impulses

- Rated for Telcordia Intra-building impulses

10/700 Protection Voltage Specified

overvoltage protector. It is designed to protect monolithic SLICs

(Subscriber Line Interface Circuits) against overvoltages on the tele-

phone line caused by lightning, a.c. power contact and induction. The

TISP61089QB limits voltages that exceed the SLIC supply rail voltage.

The TISP61089QB parameters are specified to allow equipment compli-

ance with Telcordia GR-1089-CORE Intra-building, ITU-T K.20, K.21 and

K.45 and YD/T-950.

The SLIC line driver section is typically powered from 0 V (ground) and a

negative voltage in the region of -20 V to -155 V. The protector gate is

connected to this negative supply. This references the protection

(clipping) voltage to the negative supply voltage. As the protection

voltage will then track the negative supply voltage the overvoltage stress

*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.

D Package (Top View)

Device Symbol

Description

on the SLIC is minimized.

Positive overvoltages are clipped to ground by diode forward conduction.

Negative overvoltages are initially clipped close to the SLIC negative supply

rail value. If sufficient current is available from the overvoltage, then the protector will crowbar into a low voltage on-state condition. As the

overvoltage subsides, the high holding current of the crowbar helps prevent d.c. latchup.

These monolithic protection devices are fabricated in ion-implanted planar vertical power structures for high reliability and are virtually

transparent in normal operation. The TISP61089QB buffered gate design reduces the loading on the SLIC supply during overvoltages caused

by power cross and induction. The TISP61089QB is available in an 8-pin plastic small-outline surface mount package.

How to Order

Element

40 A, 5/310

Protection Level

Diode

+12

Crowbar

-64

Device

Package

Carrier

TI

8 Pin Small Outline (D008)

SP61089QB

Embossed Tape Reeled

TISP61089QBDR-S

Order As

1089QB

Marking Code

2500

Standard Quantity