HT5761ARP

Overview

The Littelfuse HT5761ARP is a standard bidirectional DIAC trigger from the HTxxx series, designed for phase control applications. It operates within a DO-35 axial leaded package and features a breakover voltage (VBO) range of 28V to 36V. The device supports a pulse on-state current of 2A at 40°C with a 10μs width. Electrical characteristics include a maximum breakover current of 15μA and a dynamic breakback voltage of 120PPS. Thermal resistance is rated at 100°C/W junction-to-lead and 278°C/W junction-to-ambient. The component withstands operating temperatures from -40°C to +125°C.

Feature Summary

• Bidirectional triggering capability for full-wave phase control circuits
• Glass passivated junctions ensure durability against contamination
• Lead-free soldering compliance for surface mount and through-hole assembly

Applications

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

Procurement Notes

Verify the specific ordering suffix 'RP' indicates tape and reel packaging rather than bulk supply. Confirm the exact VBO tolerance class matches the design requirement, as the 5761 designation corresponds to the 28V to 36V range. Ensure the DO-35 package dimensions align with the PCB footprint specifications before finalizing procurement orders.

Selection Notes

Select this component when a breakover voltage between 28V and 36V is required for triac or SCR triggering. The HT5761ARP is suitable for low-current switching environments where minimal gate drive is needed. Consider the thermal derating curve if ambient temperatures exceed 40°C to maintain safe power dissipation levels within the specified junction temperature limits.

Part Context

This part belongs to the HTxxx & HTMxxx & STxxx Series of Standard Bidirectional DIAC Triggers manufactured by Littelfuse under the Teccor brand. The series provides a range of voltage characteristics from 27V to 70V. The HT prefix specifically denotes the DO-35 glass axial package variant within this product family.

Replacement Considerations

Compatible substitutes within the same series include HT5761AR (bulk pack) and HT5761A (different voltage range). Cross-package equivalents are available in MINIMELF (HTM5761ARP) and DO-214 (ST5761ARP) formats, provided the electrical parameters and physical mounting constraints are compatible.