QJ4008DH4RP

Triacs Overview

The Littelfuse QJ4008DH4RP is a bidirectional triac designed for surface-mount applications. It features an RMS on-state current of 8 A and a rated repetitive off-state voltage (VDRM) of 400 V. The device operates within a junction temperature range of -40°C to +150°C and utilizes a TO-252-3 package. Key electrical parameters include a maximum on-state voltage of 1.5 V, a gate trigger voltage of 1.3 V, and a gate trigger current of 10 mA. The component exhibits a maximum holding current of 35 mA and a leakage current of 10 µA at VDRM.

Triacs Feature Summary

• Integrated gate control for bidirectional AC switching
• High thermal stability with a maximum operating temperature of 150°C
• Low on-state voltage for efficient power handling

Triacs Applications

• AC motor speed control circuits
• Solid-state relay designs
• Lighting dimmer modules

Triacs Procurement Notes

Verify the specific suffix RP against official Littelfuse documentation to confirm reel packaging specifications. Ensure compatibility with standard SMD reflow profiles. Cross-reference the exact part number with manufacturer datasheets to validate pinout and thermal characteristics before integration into final assemblies.

Triacs Selection Notes

Select this component when a compact surface-mount solution is required for 400V AC switching. The TO-252-3 package offers a balance between current capacity and board space efficiency. Verify that the 10 mA gate trigger current aligns with the driving circuit capabilities for reliable turn-on under varying temperature conditions.

Triacs Part Context

This device belongs to the QJxx08xH series from Littelfuse, which focuses on high-reliability thyristors. The series provides standardized performance metrics for industrial and consumer electronics. The QJ4008DH4RP specifically addresses needs for robust AC phase control in dense PCB layouts.

Triacs Replacement Considerations

Direct substitutes include other 8A 400V TO-252 triacs such as the QJ4008DH3TP or QJ6008DH4RP, provided voltage ratings and package footprints are compatible. Verify gate sensitivity and thermal resistance differences before substitution.