TISP4070L3LM-S【PDF 1/5 页】SINGLE BIDIRECTIONAL PROTECTOR

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TISP4070L3LM, TISP4350L3LM

BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS

TISP4xx0L3LM Overvoltage Protector Series

Ion-Implanted Breakdown Region

Precise and Stable Voltage

LM Package (Top View)

Low Voltage Overshoot under Surge

T(A)

Device

V DRM

V (BO)

R(B)

‘4070

‘4350

275

350

NC - No internal connection on pin 2

MD4XATA

Ring-Tip Protection ............................................ TISP4350L3LM

Electronics Protection ....................................... TISP4070L3LM

Rated for UL 1950, ITU-T and TIA/EIA-IS-968

Device Symbol

Surge

Type

Standard

Wave

Shape

I TSP

TIA/EIA-IS-968

(formerly FCC Part 68)

10/160

10/560

SD4XAA

TIA/EIA-IS-968

UL 1950/ ITU-T K.21

9/720

10/700

Terminals T and R correspond to the

alternative line designators of A and B

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 telecommunication equipment (e.g. between the Ring to Tip wires for telephones and modems). Combinations 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.These protectors are guaranteed to voltage limit and withstand the listed lightning surges in both polarities.

After a Type A surge (200 A, 10/160, and 100 A, 10/560) the equipment is allowed to be non-operational or operational. For an operational

pass, series resistance must be added to reduce the Type A currents to within the TISP4xxxL3LM ratings (50 A, 10/160 and 30 A, 10/560).

Alternatively, a series fuse with an I 2 t greater than 0.45 A 2 s and less than 5.6 A 2 s could be used to give a non-operational pass. After a Type B

surge the equipment must be operational. As the TISP4xxxL3LM has a current rating of 40 A, will survive both Type B surges, metallic (25 A,

9/720) and longitudinal (37.5 A, 9/720), giving an operational pass to Type B surges.

For metallic protection, the TISP4350L3LM is connected between the Ring and Tip conductors. For longitudinal protection two TISP4350L3LM

protectors are used; one between the Ring conductor to ground and the other between the Tip conductor to ground. The FCC Part 68 B type

ringer has voltages of 56.5 V d.c. and up to 150 V rms a.c., giving a peak voltage of 269 V. The TISP4350L3LM will not clip the B type ringing

voltage as it has a high impedance up to 275 V.

The TISP4070L3LM should be connected after the hook switch to protect the following electronics. As the TISP4070L3LM has a high

impedance up to 58 V, it will switch off after a surge and not be triggered by the normal exchange battery voltage.

How To Order

Device

TISP4070L3

TISP4350L3

Package Type

LM (Straight Lead DO-92)

Carrier

Bulk Pack

Quantity

2 000

Order As

TISP4070L3LM-S

TISP4350L3LM-S

*RoHS Directive 2002/95/EC Jan 27 2003 including Annex

JULY 2000 - REVISED JANUARY 2007

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

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