HT35RP

Overview

The HT35RP is a DIAC (Diode for Alternating Current) manufactured by Littelfuse Inc., belonging to the Teccor HT and ST Series of bilateral trigger devices. It is housed in a DO-35 axial leaded package, designed for compact circuit integration. The component functions as a bidirectional trigger diac, providing symmetrical switching characteristics for both positive and negative voltage polarities. Key electrical specifications include a breakover voltage range of 30V to 40V and a maximum peak current rating of 2A. These parameters define its operational threshold and current handling capability within AC control circuits.

Feature Summary

• Bilateral triggering capability for symmetrical AC phase control applications
• Axial DO-35 package design for through-hole mounting and space-constrained layouts
• Defined breakover voltage window ensuring consistent gate triggering for thyristors or triacs

Applications

• Phase angle control circuits for light dimmers
• Motor speed control systems using AC power
• Triggering gates for SCRs and TRIACs in heating controls

Procurement Notes

Verify the specific manufacturer datasheet for the HT35RP to confirm exact breakover voltage tolerances and thermal ratings. Ensure the procurement source provides official Littelfuse documentation rather than third-party summaries. Cross-reference the DO-35 package dimensions with your PCB footprint requirements. Confirm RoHS compliance status if required by your manufacturing standards. Request the latest revision of the datasheet to ensure alignment with any potential specification updates from the manufacturer.

Selection Notes

Select the HT35RP when a precise 30V to 40V breakover voltage is required for reliable gate triggering in AC circuits. The DO-35 package is suitable for standard through-hole assembly processes. Consider the 2A peak current rating to ensure it exceeds the maximum expected gate current of the controlled device. Evaluate the bilateral symmetry requirements of the application to confirm this DIAC type matches the circuit topology. Compare against other series voltages if tighter or wider triggering thresholds are needed.

Part Context

The HT35RP is part of Littelfuse's broader portfolio of discrete semiconductors, specifically within the Teccor brand family of thyristor control devices. This series includes various DIACs and SIDACs designed for robust AC switching performance. The component complements other Littelfuse products used in power management and protection, offering a standardized solution for triggering elements in consumer electronics and industrial control panels requiring reliable AC phase control.

Replacement Considerations

Check for direct substitutes within the same Teccor HT/ST series that match the 30-40V breakover range and DO-35 package. Verify that alternative components maintain identical peak current ratings and bilateral characteristics. Ensure pin compatibility and thermal performance meet the original design constraints before substitution.