Q4008VH4

Triacs Overview

The Q4008VH4 is a bidirectional triac from Littelfuse, rated for 400V repetitive peak off-state voltage and 8A RMS on-state current. It utilizes the V-Pak (TO-251) surface-mount package. The device features a sensitive gate trigger with a maximum DC gate trigger current of 35mA and a maximum DC gate trigger voltage of 1.3V. It offers high commutation capability and is designed for AC switching applications.

Triacs Feature Summary

• High commutation performance suitable for demanding AC loads
• Sensitive gate drive requirements for efficient control circuitry
• Surface-mount TO-251 package for automated assembly

Triacs Applications

• AC solid-state switches
• Motor speed controls
• Temperature modulation systems

Triacs Procurement Notes

Verify component authenticity through authorized Littelfuse channels or certified distributors. Confirm RoHS compliance status and check for specific manufacturing date codes relevant to your supply chain requirements. Ensure storage conditions meet manufacturer specifications to maintain device integrity prior to soldering.

Triacs Selection Notes

Select this component when a surface-mount TRIAC is required for 400V AC applications. The 8A RMS rating supports moderate power loads. Consider the TO-251 footprint constraints and thermal management needs for PCB layout design compared to through-hole alternatives in the same series.

Triacs Part Context

This part belongs to the Low Power TRIAC series by Littelfuse, offering up to 1200V blocking capabilities across the family. The Q4008VH4 specifically addresses the 400V segment with an 8A current capacity, providing a compact solution for consumer electronics and industrial control boards requiring reliable phase control.

Triacs Replacement Considerations

DigiKey lists parametric equivalents as substitutes. Verify that any replacement maintains the 400V VDRM, 8A IT(RMS), and TO-251 package dimensions. Cross-reference gate trigger characteristics to ensure compatibility with existing driver circuits.