Q8008DH4

Triacs Overview

The Littelfuse Q8008DH4 is a bidirectional triac designed for high-reliability AC power control applications. It features an 8 A RMS on-state current and supports a rated repetitive off-state voltage of 800 V. The device operates within a junction temperature range of -40 °C to +125 °C and utilizes a TO-252AA surface-mount package. Key electrical characteristics include a maximum holding current of 35 mA, a gate trigger voltage of 1.3 V, and a gate trigger current of 35 mA. It exhibits a typical on-state voltage of 1.6 V and offers a non-repetitive peak on-state current capability of 80 A or 85 A depending on the specific test condition.

Triacs Feature Summary

• High reliability construction suitable for demanding industrial environments
• Surface-mount TO-252AA package optimized for automated PCB assembly
• Robust commutation performance with specified critical rates of rise of off-state voltage and on-state current

Triacs Applications

• Industrial motor speed control systems
• Solid-state relays for AC load switching
• General-purpose AC power regulation circuits

Triacs Procurement Notes

Verify the exact suffix against the manufacturer's official datasheet to confirm pinout compatibility and thermal specifications. Ensure that the ordering documentation explicitly references the Q8008DH4 part number to avoid confusion with similar series variants. Confirm RoHS compliance status through the latest regulatory declaration provided by Littelfuse before finalizing procurement orders.

Triacs Selection Notes

Select this component when an 800 V blocking voltage and 8 A continuous current rating are required in a compact surface-mount form factor. Evaluate the thermal management requirements based on the TO-252AA package constraints and the specified maximum operating temperature of 125 °C. Ensure the gate drive circuit can supply at least 35 mA to guarantee reliable triggering under all expected load conditions.

Triacs Part Context

This device belongs to the Qxx08xHx series of high-reliability triacs manufactured by Littelfuse. The series is engineered for robust performance in industrial power control applications where consistent switching behavior and long-term durability are critical. The Q8008DH4 specifically addresses the need for medium-power AC switching in space-constrained designs requiring surface-mount integration.

Triacs Replacement Considerations

The QK008DH4 serves as a higher voltage variant within the same family, offering a 1 kV rating instead of 800 V. Designers should verify if the increased voltage rating provides necessary safety margins or if it introduces unnecessary cost or parameter mismatches for the specific application requirements.