HT36B

Overview

The Littelfuse HT36B is a bilateral trigger DIAC from the HTxxx series, designed for phase control applications. It operates in a DO-35 glass case package and features a breakover voltage range of 34V to 38V at 25°C junction temperature. The device supports a maximum pulse on-state current of 2A under specified conditions and handles a storage temperature range from -40°C to +125°C. It exhibits a breakover voltage symmetry of ±2V and includes a dynamic breakback voltage specification. The component utilizes matte-tin plated terminals for lead-free soldering compatibility.

Feature Summary

• Bidirectional triggering capability for symmetrical AC phase control
• Robust construction with high junction contamination resistance
• Lead-free compliant terminal finish for environmental safety
• High reliability through rigorous thermal and humidity testing

Applications

• Triac and SCR triggering in lamp dimming circuits
• Universal motor speed control systems
• Solid state ballast lighting controls for transistor triggering
• Heat control circuits requiring precise phase angle regulation

Procurement Notes

Verify the specific ordering suffix to confirm packaging type, as bulk and reel pack options exist for the DO-35 package. Ensure the selected variant matches the required breakover voltage tolerance for the target application. Confirm compliance with RoHS directives if lead-free assembly is mandated. Cross-reference the part number against the latest manufacturer datasheet to account for potential specification updates or discontinuations.

Selection Notes

Select the HT36B when a breakover voltage between 34V and 38V is required for bidirectional triggering. Consider the DO-35 package size for through-hole mounting constraints. Evaluate the thermal derating requirements if operating above 40°C ambient temperature. Ensure the circuit design accommodates the peak on-state current limits and switching time characteristics defined in the electrical specifications.

Part Context

The HT36B belongs to the Teccor brand Thyristors family, specifically the HTxxx series of standard bidirectional DIAC triggers. This series offers a wide range of breakover voltages from 27V to 70V across multiple package types including DO-35, MINIMELF, and DO-214. The HT series specifically denotes the DO-35 glass axial leaded package configuration within this product line.

Replacement Considerations

Compatible substitutes within the same series include HT36A (32V-40V) and HT36B variants with different packaging suffixes such as HT36BRP for reel packing. Other voltage ratings like HT35 or HT40 may serve as alternatives if the breakover voltage tolerance aligns with the circuit requirements.