QK004L4TP

Triacs Overview

The Littelfuse QK004L4TP is a four-quadrant triac designed for AC power control applications. It features a TO-220 package with three pins for through-hole mounting. The device has a rated average on-state current of 4 A and a repetitive peak reverse voltage of 400 V. Key electrical parameters include a maximum gate trigger current of 10 mA, a maximum gate trigger voltage of 1.3 V, and a holding current of 20 mA. It supports a surge current rating of 55 A and operates within a temperature range of -40°C to 125°C.

Triacs Feature Summary

• Four-quadrant triggering capability ensures reliable operation across all gate signal polarities.
• Robust thermal management design suitable for high-power density installations.
• High surge current handling capacity protects against transient load conditions.

Triacs Applications

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

Triacs Procurement Notes

Verify the specific suffix 'L' in the part number QK004L4TP against official Littelfuse documentation to confirm pinout configuration and lead finish specifications. Ensure the procurement channel provides genuine components with traceable manufacturing data to guarantee performance reliability in critical power control systems.

Triacs Selection Notes

Select this component when a 4 A RMS current rating and 400 V blocking voltage are required for AC switching tasks. The TO-220 package facilitates direct heatsinking for efficient thermal dissipation. Verify that the gate drive circuit can supply at least 10 mA to ensure consistent turn-on under varying load conditions.

Triacs Part Context

This triac belongs to the Littelfuse general-purpose thyristor family, engineered for industrial and consumer AC power regulation. It complements other discrete power semiconductors by offering a balance of current handling and voltage blocking in a standard through-hole form factor suitable for PCB integration.

Triacs Replacement Considerations

Consult official Littelfuse substitution guides for verified equivalents. Generic replacements may differ in gate sensitivity or thermal resistance characteristics. Validate any alternative part against the original datasheet parameters before implementation.

Triacs FAQ

What is the maximum gate trigger current required?

The maximum gate trigger current (Igt) is specified as 10 mA.

Does this device support four-quadrant triggering?

Yes, the QK004L4TP is a four-quadrant triac, allowing triggering with positive or negative gate signals relative to the main terminal.