Q4008DH4RP

Triacs Overview

The Littelfuse Q4008DH4RP is a bidirectional triac designed for AC power control applications. It features an RMS on-state current (It RMS) of 8 A and a rated repetitive peak off-state voltage (VDRM) of 400 V. The device exhibits a maximum on-state voltage of 1.6 V and a gate trigger voltage (Vgt) of 1.3 V with a gate trigger current (Igt) of 35 mA. Non-repetitive peak on-state currents are specified at 80 A and 85 A. Leakage current in the off-state is limited to 10 uA at VDRM, while the maximum holding current (Ih) is 35 mA. Operating temperatures range from -40 C to +125 C. The component utilizes an SMD/SMT installation style within a TO-252-3 package.

Triacs Feature Summary

• Integrated thermal protection mechanisms for enhanced reliability under high-stress conditions
• Glass-passivated junctions to ensure long-term parameter stability and device longevity
• High dv/dt rating capability to maintain noise immunity during rapid voltage transitions

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 packaging configuration and reel specifications. Ensure compatibility with RoHS directives and REACH SVHC requirements prior to integration. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability. Confirm that the TO-252-3 footprint matches the target PCB design constraints.

Triacs Selection Notes

Select this component when a surface-mount triac with 8 A continuous current handling and 400 V blocking voltage is required. Compare the TO-252-3 package dimensions against available board space. Evaluate the 1.6 V on-state voltage drop for thermal management efficiency. Verify that the 35 mA gate drive capability aligns with the control circuit output specifications.

Triacs Part Context

This device belongs to the Qxx08xHx series of high-reliability triacs manufactured by Littelfuse. The series is characterized by robust construction suitable for demanding industrial and consumer power control environments. The Q4008DH4RP variant specifically addresses the need for compact surface-mount solutions in AC switching applications requiring moderate current ratings.

Triacs Replacement Considerations

Q4008DH4TP offers identical electrical characteristics but utilizes tube packaging instead of reel packaging.