Q4008VH3

Triacs Overview

The Littelfuse Q4008VH3 is an Alternistor TRIAC rated for a maximum repetitive off-state voltage of 400 V and an RMS on-state current of 8 A. Housed in a TO-251 (TO-251AA) three-pin package, it features a gate trigger voltage of 1.3 V and a gate trigger current of 10 mA. The device has a holding current of 15 mA and a non-repetitive peak on-state current of 8 A. It operates within a temperature range of -40°C to +150°C and offers a critical rate of rise of off-state voltage of 20 V/µs.

Triacs Feature Summary

• High reliability construction with main terminal 2 connection
• Sensitive gate triggering capability for efficient drive circuits
• Robust thermal performance suitable for high-temperature environments

Triacs Applications

• Solid state relays
• Motor speed control circuits
• Lighting dimmer applications

Triacs Procurement Notes

Verify the specific ordering suffix and manufacturer documentation to confirm exact electrical tolerances and compliance status. Ensure the component matches the required voltage and current ratings for the target circuit design before procurement.

Triacs Selection Notes

Select this component when a 400 V blocking voltage and 8 A continuous current are required in a compact TO-251 footprint. Consider the 1.3 V gate trigger requirement for driver compatibility and verify thermal management needs for operation up to 150°C.

Triacs Part Context

This part belongs to the Littelfuse Alternistor family, designed for general-purpose AC power switching. It serves as a bidirectional thyristor solution for controlling AC loads in consumer and industrial electronics where moderate current handling and reliable switching are essential.

Triacs Replacement Considerations

Check for direct pin-compatible alternatives from other manufacturers offering identical 400 V / 8 A specifications in TO-251 packages. Verify that any substitute maintains the same gate trigger characteristics and thermal resistance values.