337

©2008 Littelfuse, Inc.

Revised: July 9, 2008

Specifications are subject to change without notice.

Please refer to http://www.littelfuse.com for current information.

337

©2008 Littelfuse, Inc.

Specifications are subject to change without notice.

Please refer to http://www.littelfuse.com for current information.

HTxxx & HTMxxx & STxxx Series

Standard Bidirectional DIAC Trigger

HTxxx & HTMxxx & STxxx Series

The HTM, HT, and ST series of bilateral trigger DIACs offer

a range of voltage characteristics from 27V to 70V. A DIAC

semiconductor is a full-wave or bidirectional Thyristor. It is

triggered from a blocking state to a conduction state for

either polarity of applied voltage whenever the amplitude of

applied voltage exceeds the breakover voltage of the DIAC.

Description

Features & Benefits

compliant

junctions

selections

junction contamination

ST Series:

(DO-214)

bonded die attachment

HTM/HT Series:

package

Schematic Symbol

Absolute Maximum Ratings

Symbol

Parameter

Test Conditions

Min

Max

Unit

I

TRM

Pulse On-State Current

120PPS, T

pulse width = 10 μS

2

A

T

S

Storage Temperature Range

-40

+125

°C

T

J

Operating Junction Temperature

-40

+125

°C

P

D(AV)

Device Power Dissipation

T

See Product

Selector Table

mW

(*)Only Applies to HT-60

Notes:

1. Service Dissipation (at T

and 300mW for DO214

2. Above +40°C, Derate: 3.6mW/°C for DO-35 and MINIMELF/SOD-80

and 3mW/°C for DO214

DIACs are used to trigger Triacs and SCRs in phase control

circuits for lamp dimming, universal motor speed control,

and heat control. They are used also for triggering

transistors in solid state ballast lighting controls.

Applications