HT40RP

Overview

The HT40RP is a DIAC (Diode for Alternating Current) manufactured by Littelfuse Inc. It is designed for triggering triacs and thyristors in AC power control applications. The device features a breakover voltage range of 35 to 45 volts and can handle a peak current of 2 amperes. It is housed in a DO-35 axial glass passivated package, suitable for through-hole mounting. The component operates with a breakover current of 15 microamperes, ensuring reliable switching characteristics for phase control circuits.

Feature Summary

• Symmetric bidirectional switching behavior for AC phase control
• Glass passivated DO-35 axial package for environmental stability
• Defined breakover voltage range for precise trigger timing

Applications

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

Procurement Notes

Verify the exact manufacturer part number against official Littelfuse documentation to ensure authenticity. Confirm that the DO-35 package type matches your PCB layout requirements. Check for any specific handling instructions related to the glass passivation process during assembly. Ensure compliance with RoHS directives if applicable to your manufacturing standards.

Selection Notes

Select this component when a symmetric bidirectional switch is required for low-power triac triggering. The 35-45V breakover voltage range suits standard mains voltage applications. Consider the DO-35 package size for space-constrained designs. Verify thermal dissipation needs as the device handles peak currents up to 2A during switching events.

Part Context

The HT40RP belongs to the DIAC family within Littelfuse's circuit protection and power control portfolio. These devices are essential for providing consistent trigger pulses to thyristors in AC power regulation systems. The DO-35 package is a standard form factor for small-signal semiconductor components used in consumer electronics and industrial control panels.

Replacement Considerations

Consult Littelfuse official substitution guides for equivalent DIACs with matching voltage and current ratings. Verify pin compatibility and package dimensions before replacing. Ensure alternative components meet the same breakover voltage tolerance and peak current specifications.