HT5761A

DIACs, SIDACs Overview

The Littelfuse HT5761A is a standard bidirectional DIAC trigger device belonging to the HTxxx series. It operates within a breakover voltage range of 28V to 36V at 50/60Hz sine wave conditions. The component features a DO-35 axial leaded package and supports a maximum pulse on-state current of 1.5A (120PPS, 10μs width). It functions by triggering from a blocking state to conduction when applied voltage exceeds its breakover threshold for either polarity.

DIACs, SIDACs Feature Summary

• Bidirectional switching capability for full-wave phase control applications
• Glass passivated junction construction for durability
• Compatible with lead-free reflow soldering processes

DIACs, SIDACs Applications

• Phase control circuits for lamp dimming
• Universal motor speed control systems
• Heat control circuitry
• Solid state ballast lighting controls

DIACs, SIDACs Procurement Notes

Verify the specific ordering suffix against the datasheet to confirm the package type and packing mode. The HT5761A designation corresponds to the 32A voltage range in the DO-35 package. Confirm whether bulk or reel pack availability aligns with manufacturing requirements before finalizing orders.

DIACs, SIDACs Selection Notes

Select this component based on the required breakover voltage symmetry and operating temperature range. Ensure the application's peak current does not exceed the 1.5A limit under specified pulse conditions. Verify thermal derating requirements if ambient temperatures exceed 40°C to maintain safe operation.

DIACs, SIDACs Part Context

This part belongs to the HTxxx & HTMxxx & STxxx Standard Bidirectional DIAC Trigger series manufactured by Littelfuse. These devices are designed as bilateral trigger DIACs offering a range of voltage characteristics from 27V to 70V. They serve as semiconductor switches triggered by exceeding breakover voltage thresholds.

DIACs, SIDACs Replacement Considerations

Direct substitutes include other parts within the HT32A voltage range such as HT-32A. Cross-package equivalents like ST-32A (DO-214) or HTM-32A (MINIMELF) may be considered if form factor changes are acceptable.