HT36A

Overview

The Littelfuse HT36A is a bidirectional DIAC trigger device belonging to the HTxxx series. It operates within a breakover voltage range of 32V to 40V at 50/60Hz sine wave conditions. The component features a minimum breakover current of 15 μA and provides a breakback voltage between 5V and 15V depending on specific test currents. It supports a pulse on-state current of 2A under specified conditions and functions reliably across an operating junction temperature range of -40°C to +125°C.

Feature Summary

• Bidirectional triggering capability for full-wave phase control applications
• High-temperature voltage blocking reliability verified through extended stress testing
• Robust construction with glass passivated junctions resistant to contamination

Applications

• Triggering Triacs and SCRs in lamp dimming circuits
• Universal motor speed control systems
• Solid state ballast lighting controls

Procurement Notes

Verify the package configuration, as the HT36A designation corresponds to the DO-35 leaded format. Confirm that the required breakover voltage tolerance aligns with the standard 32V to 40V range provided in the datasheet specifications. Ensure compatibility with the specified thermal dissipation limits during operation.

Selection Notes

Select this component when a symmetric bidirectional trigger is required for AC phase control. Verify that the circuit's peak voltage does not exceed the maximum breakover rating to prevent unintended firing. Consider the thermal resistance characteristics if mounting density or ambient temperatures approach the upper operational limits defined in the absolute maximum ratings.

Part Context

This part belongs to the HTxxx & HTMxxx & STxxx Series of Standard Bidirectional DIAC Triggers manufactured by Littelfuse. The series offers a broad range of voltage characteristics from 27V to 70V. The HT prefix specifically denotes the DO-35 axial leaded package variant within this product family.

Replacement Considerations

Compatible substitutes include other DIACs with matching bidirectional characteristics and similar breakover voltage ranges, such as DB3 or equivalent generic DIAC components. Ensure any replacement meets the required pulse on-state current and thermal dissipation specifications for the specific application environment.