QJ4008DH4TP

Triacs Overview

The Littelfuse QJ4008DH4TP 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 temperature range of -40 °C to +150 °C and utilizes a TO-252-3 package. Key electrical parameters include a maximum holding current of 35 mA, a gate trigger voltage of 1.3 V, and a gate trigger current of 10 mA. The on-state voltage is specified at 1.5 V, with a leakage current of 10 uA under VDRM conditions.

Triacs Feature Summary

• Surface-mount construction in a compact TO-252-3 package for automated assembly
• High thermal stability supporting operation up to +150 °C
• Low gate sensitivity requiring minimal drive current for reliable triggering

Triacs Applications

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

Triacs Procurement Notes

Verify the specific suffix 'H4' against official Littelfuse documentation to confirm exact pinout and electrical tolerances. Ensure the procurement channel provides valid RoHS compliance certificates. Confirm that the TO-252-3 package matches the target PCB footprint requirements before finalizing orders.

Triacs Selection Notes

Select this component when a surface-mount triac with 400 V blocking capability and 8 A continuous current is required. Compare the 10 mA gate trigger current against alternative devices if low-power driving is critical. Verify that the +150 °C junction temperature rating aligns with the thermal management design of the host equipment.

Triacs Part Context

This part belongs to the QJxx08xH series of high-performance triacs from Littelfuse. The series is characterized by robust construction suitable for industrial power control environments. The QJ4008DH4TP specifically addresses the need for compact, high-reliability switching solutions in modern electronic designs.

Triacs Replacement Considerations

The QJ4008DH3TP is a documented variant within the same series offering similar electrical characteristics but potentially different manufacturing specifications. Cross-reference datasheets to ensure compatibility regarding gate sensitivity and thermal resistance before substitution.