QK004V4TP

Triacs Overview

The Littelfuse QK004V4TP is a bidirectional triac designed for AC power control applications. It features a voltage rating of 400 V and an on-state current capacity of 4 A. The device utilizes a gate trigger current range of 25 mA to 25 mA, indicating a specific sensitivity profile for reliable switching. Packaged in a TO-92 form factor, this component is intended for use in circuits requiring compact AC switching solutions with defined thermal and electrical limits.

Triacs Feature Summary

• Bidirectional AC switching capability for phase control
• Integrated gate trigger mechanism for direct drive compatibility
• Compact leaded package suitable for space-constrained PCB layouts

Triacs Applications

• Lighting dimmer circuits
• Small motor speed controls
• Temperature modulation controllers

Triacs Procurement Notes

Verify the exact part number suffix against official Littelfuse documentation to ensure correct voltage and current ratings. Confirm RoHS compliance status and packaging specifications directly with authorized distributors or the manufacturer before ordering. Cross-reference datasheet revisions to avoid obsolete variants.

Triacs Selection Notes

Select this component when a 400 V blocking voltage and 4 A continuous current are required for AC load switching. Ensure the application's peak transient voltages remain within the device's rated limits. Verify that the gate drive circuitry can supply the necessary trigger current for reliable turn-on under all operating temperatures.

Triacs Part Context

This triac belongs to the general family of AC power control semiconductors offered by Littelfuse. It serves as a solid-state alternative to mechanical relays in low-to-medium power AC applications. The device integrates the main terminals and gate structure into a single silicon chip, providing robust performance in consumer electronics and industrial control modules.

Triacs Replacement Considerations

Consult Littelfuse official substitution guides for verified equivalents. Generic replacements must match the 400 V rating, 4 A current capacity, and TO-92 package dimensions. Verify gate trigger characteristics and thermal resistance values to ensure functional parity in the target circuit.