Q4008RH4

Triacs Overview

The Littelfuse Q4008RH4 is a bidirectional triac designed for AC power control applications. It features an RMS on-state current rating 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 +125°C. 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 35 mA. The on-state voltage is specified at 1.6 V, with a maximum off-state leakage current of 10 uA under VDRM conditions. Non-repetitive peak on-state currents are rated at 83 A and 100 A. The component utilizes a TO-220-3 through-hole package.

Triacs Feature Summary

• Bidirectional switching capability for alternating current circuits
• High thermal stability supporting operation up to 125°C
• Low gate sensitivity facilitating direct drive from logic interfaces

Triacs Applications

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

Triacs Procurement Notes

Verify the specific suffix against Littelfuse documentation to confirm pinout configuration and exact electrical tolerances. Ensure the procurement specification matches the required package type and thermal characteristics for the target application environment.

Triacs Selection Notes

Select this component based on the 400 V blocking voltage requirement and 8 A continuous current capacity. Evaluate the gate trigger specifications to ensure compatibility with the driving circuit's output capabilities and verify that the TO-220-3 package fits the available board space.

Triacs Part Context

This part belongs to the Littelfuse Qxx08xHx series of high-sensitivity triacs. The series is characterized by low gate current requirements and robust performance in industrial power control environments, offering a standardized solution for replacing older generation thyristors in AC regulation designs.

Triacs Replacement Considerations

Cross-reference with Q4008RH467TP for identical electrical ratings and package dimensions. Verify pin alignment and thermal pad specifications before substitution.