HT32A - HTxxx/HTMxxx/STxxx Series

Series: HTxxx/HTMxxx/STxxx      Obsolete: 2009-12-31 Questions? Contact Littelfuse Support
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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.

Littelfuse's Teccor brand "HT" and "ST" Series of bilateral trigger diacs are available with switching voltages from 27V to 70V.

A diac is a full-wave or bidirectional thyristor. Whenever the amplitude of applied voltage exceeds the breakover voltage rating of the diac, it switches from blocking- to conducting-state.

Teccor diacs feature glass-passivated junctions that ensure long term reliability and stable characteristics by creating a rugged, reliable barrier against junction contamination.

These diac specifications are for standard products. Special parameter selections such as close tolerance voltage symmetry are available. Please consult the factory for more information for custom design applications.

  • Breakover voltage symmetry as close as 1 V is available from the factory on these products.
  • Lead solder temperature is +230°C for 10-second maximum ≥1/16" (1.59 mm) from case.
Property (Mouseover for details) Value
Package Size DO-35
Trigger Voltage (VBOMAX) (V) 36
Trigger Voltage (VBOMIN) (V) 28

Wuxi ISO TS16949 Certification

Document ChinaRoHS_Thyristor_DIAC_DO-35.pdf

ChinaRoHS_Sidactor_Sidac_Diac_Compak_DO 214 Compliant pdf

Document RoHS_Compliance_Thyristor_Diac_DO35_2006-03-20.pdf

pdf icon Fundamental Characteristics of Thyristors Application Note

The thyristor family of semiconductors consists of several very useful devices. The most widely used of this family are silicon controlled rectifiers (SCRs), triacs, sidacs, and diacs. In many applications these devices perform key functions and are real assets in meeting environmental, speed, and reliability specifications which their electro-mechanical counterparts cannot fulfill. This application note presents the basic fundamentals of SCR, triac, sidac, and diac thyristors so the user understands how they differ in characteristics and parameters from their electromechanical counterparts. Also, thyristor terminology is defined.

pdf icon Mounting and Handling of Semiconductor Devices Application Note

Proper mounting and handling of semiconductor devices, particularly those used in power applications, is an important, yet sometimes overlooked, consideration in the assembly of electronic systems. Power devices need adequate heat dissipation to increase operating life and reliability and allow the device to operate within manufacturers' specifications. Also, in order to avoid damage to the semiconductor chip or internal assembly, the devices should not be abused during assembly. Very often, device failures can be attributed directly to a heat sinking or assembly damage problem. The information in this application note guides the semiconductor user in the proper use of Teccor devices, particularly the popular and versatile TO-220 and TO-202 epoxy packages.

pdf icon Surface Mount Soldering Recommendations Application Note

The most important consideration in reliability is achieving a good solder bond between surface mount device (SMD) and substrate since the solder provides the thermal path from the chip. A good bond is less subject to thermal fatiguing and will result in improved device reliability. This application note discusses the different soldering methods for Littelfuse's Teccor brand thyristor products.

AN1006 Testing Teccor Semiconductor Devices Using Curve Tracers

One of the most useful and versatile instruments for testing semiconductor devices is the curve tracer (CT). Although widely used by semiconductor manufacturers for design and analytical work, the device consumer will find many uses for the curve tracer, such as incoming quality control, failure analysis, and supplier comparison. Curve tracers may be easily adapted for go-no go production testing. This application note describes how to use curve tracers.

AN1009 Teccor Thyristors Miscellaneous Design Tips and Facts

This application note presents design tips and facts on the following topics: -Relationship of IAV, IRMS, and IPK -dv/dt Definitions -Examples of gate terminations -Curves for Average Current at Various Conduction Angles -Double-exponential Impulse Waveform -Failure Modes of Thyristor -Characteristics Formulas for Phase Control

DO 214 Package Size Obsoletion for DIACs

pdf icon Product Selection Guide

Electronics Circuit Protection Product Selection Guide - A guide to selecting Littelfuse circuit protection components for electronic applications...

pdf icon Circuit Protection Technology Application Matrix

Littelfuse is the world leader in the design and manufacturing of fuses for the automotive, industrial, handheld, computer and telecom markets...

pdf icon Switching Thyristor Product Catalog