HT34BRP

Overview

The HT34BRP is a DIAC thyristor manufactured by Littelfuse Inc., designed for triggering triacs and SCRs in AC power control circuits. It operates within a breakover voltage range of 30 to 40V and supports a peak output current of 2A. The component is housed in a DO-35 glass passivated axial leaded package, suitable for through-hole mounting. It features an operating temperature range from -40°C to 125°C (TJ), ensuring reliable performance across diverse environmental conditions.

Feature Summary

• Symmetrical bidirectional switching capability for phase control applications
• Glass passivated DO-35 package for enhanced durability
• Wide thermal operating range for industrial stability

Applications

• Triac gate triggering circuits
• Light dimmer controls
• Motor speed controllers

Procurement Notes

Verify the specific manufacturer source and lot traceability upon ordering. Confirm that the received components match the HT34BRP designation and DO-35 package style. Check for physical integrity of the glass envelope and leads. Ensure storage conditions comply with moisture sensitivity levels if applicable. Validate datasheet revisions against the procurement date.

Selection Notes

Select this component when a symmetrical trigger device is required for AC phase angle control. The 30-40V breakover range suits standard triac gate thresholds. The DO-35 package allows for automated or manual insertion. Consider the 2A peak current limit for load requirements. Evaluate the -40°C to 125°C range against ambient operating temperatures.

Part Context

This part belongs to the DIAC family of bilateral trigger diodes used primarily in light dimming and motor speed regulation. It serves as a gate trigger element for larger thyristors. The DO-35 package is a standard axial leaded form factor common in legacy and modern AC power designs. It complements triac-based solutions for simple, cost-effective phase control.

Replacement Considerations

Check for direct equivalents such as DB3 variants if pinout and electrical characteristics align. Verify breakover voltage symmetry and peak current ratings before substitution. Ensure the replacement maintains the DO-35 package dimensions for board compatibility.