Q8040K7TP

Triacs Overview

The Littelfuse Q8040K7TP is a bidirectional triac from the Qxx40xx series, rated for 800 V repetitive peak off-state voltage and 40 A RMS on-state current. It utilizes an SMTO-218 (TO-218AC) through-hole package designed for flange mounting. Key electrical parameters include a maximum holding current of 120 mA, gate trigger voltage of 2.5 V, and gate trigger current of 100 mA. The device exhibits a typical on-state voltage of 1.8 V and leakage current of 20 uA at rated voltage. It operates within a temperature range of -40°C to +125°C.

Triacs Feature Summary

• High-voltage blocking capability suitable for AC power control applications
• Robust thermal management via flange-mountable TO-218AC package
• Insensitive gate characteristics with defined trigger thresholds

Triacs Applications

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

Triacs Procurement Notes

Verify component authenticity by cross-referencing the manufacturer's part number and date code against official Littelfuse documentation. Ensure the received package matches the specified SMTO-218 form factor. Confirm RoHS compliance status through the latest datasheet revision or certificate of conformity provided by the supplier.

Triacs Selection Notes

Select this component when an 800 V rating is required instead of higher voltage variants like the QK040K7TP. The 40 A current capacity suits moderate power loads. Verify that the circuit design accommodates the specific gate trigger requirements and that the PCB layout supports the through-hole flange mounting style for adequate heat dissipation.

Triacs Part Context

This part belongs to the Littelfuse Teccor Qxx40xx series of high-power triacs. It shares the same current rating and package as other series members but differs in voltage rating. For instance, the QK040K7TP offers 1000 V blocking capability, while the Q8040J7TP provides similar 800 V performance with potentially different gate sensitivity specifications.

Triacs Replacement Considerations

Direct substitutes within the same voltage class include the Q8040J7TP. Designers should verify if the alternative gate trigger current specifications meet the driving circuit requirements before swapping components.