QK040K5TP

Triacs Overview

The Littelfuse QK040K5TP is a TRIAC Alternistor rated for 1 kV blocking voltage and 40 A RMS on-state current. Housed in an isolated TO-218AC (TO-218-3) through-hole package, it supports junction temperatures from -40°C to +125°C. The device features a non-latching single configuration with a maximum gate trigger current of 50 mA and a holding current of 75 mA. Non-repetitive surge currents are specified at 335 A for 50 Hz and 400 A for 60 Hz frequencies.

Triacs Feature Summary

• Alternistor technology provides high dv/dt immunity without requiring external snubber circuits.
• Isolated mounting tab design facilitates secure installation on heatsinks while maintaining electrical separation.

Triacs Applications

• Industrial motor control systems
• High-power heating element regulation
• Solid-state relay modules

Triacs Procurement Notes

Verify the complete part number including suffixes against official Littelfuse documentation to ensure correct packaging and specific electrical tolerances. Confirm RoHS3 compliance status during sourcing. Cross-reference distributor catalogs with manufacturer datasheets to validate availability and lead times before finalizing procurement plans.

Triacs Selection Notes

Select this component when high dv/dt sensitivity is required without added circuit complexity. Ensure the thermal management solution accommodates the TO-218AC package and the specified 125°C junction temperature limit. Verify that the 40 A RMS rating aligns with the continuous load requirements of the target application circuit.

Triacs Part Context

This device belongs to the Qxx40xx series of TRIAC Alternistors manufactured by Littelfuse Inc. It is designed as a robust power switching solution for demanding industrial environments where reliable commutation and high voltage isolation are critical operational parameters.

Triacs Replacement Considerations

Consult Littelfuse official substitution guides for verified equivalents. Generic TRIAC replacements may lack the specific Alternistor characteristics or isolation features required for direct interchangeability in existing designs.

Triacs FAQ

Does the QK040K5TP require an external snubber circuit?

No, the Alternistor technology integrated into this device provides sufficient dv/dt immunity, eliminating the need for external snubber networks.

What is the maximum operating junction temperature?

The maximum operating junction temperature is +125°C.