HT5761

Overview

The Littelfuse HT5761 is a bilateral trigger DIAC semiconductor from the HTxxx series, designed for phase control applications. It operates in the DO-35 package and features a breakover voltage (VBO) range of 28 V to 36 V at 50/60 Hz. The device has a maximum pulse on-state current (ITRM) of 2 A and a breakover current (IBO) of 15 μA. It supports an operating junction temperature range from -40 °C to +125 °C with a power dissipation of 250 mW. The component utilizes full-wave bidirectional triggering characteristics.

Feature Summary

• Bidirectional switching capability for symmetrical AC phase control
• Robust construction with glass case body and matte-tin plated terminals
• High thermal stability across extended industrial temperature ranges

Applications

• Lamp dimming circuits
• Universal motor speed control systems
• Heat control applications
• Solid state ballast lighting controls

Procurement Notes

Verify the specific ordering suffix when purchasing. The base part number HT5761 indicates the electrical specifications, while suffixes such as RP denote reel packaging and blank suffixes indicate bulk packing. Confirm the package type matches the design requirements before finalizing orders.

Selection Notes

Select this component based on the required breakover voltage symmetry and the peak current demands of the load circuit. Ensure the thermal management strategy accommodates the specified power dissipation limits and derating curves above 40 °C ambient temperature.

Part Context

This device belongs to the standard bidirectional DIAC trigger family manufactured by Littelfuse under the Teccor brand. It serves as a gate trigger element for thyristors and triacs in various power electronics configurations requiring precise firing angle control.

Replacement Considerations

Compatible substitutes within the same family include HT5761A and HTM5761, which share identical electrical parameters but differ in physical package configuration.