QK040K7

Triacs Overview

The Littelfuse QK040K7 is a Triac from the Qxx40xx series, rated for 1000 V repetitive peak off-state voltage and 40 A RMS on-state current. It utilizes an IsoPlan package (TO-218AC) with an electrically isolated mounting tab for direct heatsink attachment without additional insulation hardware. The device operates within a junction temperature range of -40°C to +125°C. Key electrical characteristics include a maximum holding current of 120 mA, a gate trigger voltage of 2.5 V, and a gate trigger current of 100 mA. Non-repetitive surge currents are specified at 335 A and 400 A under different conditions.

Triacs Feature Summary

• IsoPlan isolation technology enables secure flange mounting directly to heatsinks while maintaining electrical safety.
• High thermal stability supports reliable operation in demanding industrial environments across a wide temperature range.

Triacs Applications

• Industrial motor control systems
• Solid-state relays
• Power regulation circuits

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm exact electrical tolerances. Distributor listings may vary; always cross-reference the manufacturer datasheet for the definitive pinout and thermal specifications before finalizing procurement orders.

Triacs Selection Notes

Select this component when high-voltage isolation and robust thermal management are required. The TO-218AC package facilitates efficient heat dissipation for continuous high-current applications. Ensure the gate drive circuit can supply the specified trigger current requirements for reliable switching.

Triacs Part Context

This part belongs to the Qxx40xx series of Thyristors manufactured by Littelfuse. The series is characterized by its use of IsoPlan packaging, which integrates isolation capabilities into the standard TO-218 form factor, simplifying assembly in power electronics designs.

Triacs Replacement Considerations

The QK040K5TP is a documented alternative within the same series offering similar voltage and current ratings but with different gate trigger parameters. Verify compatibility with existing gate drive circuits before substitution.

Triacs FAQ

Does the QK040K7 require an insulating washer for heatsink mounting?

No, the IsoPlan package design allows for direct mounting to the heatsink without the need for additional insulating washers or thermal pads.

What is the maximum operating junction temperature?

The maximum operating junction temperature is +125°C.