Q8040K4TP

Triacs Overview

The Littelfuse Q8040K4TP is a bidirectional triac designed for high-power AC switching applications. It features an RMS on-state current (It RMS) of 40 A and a rated repetitive peak off-state voltage (VDRM) of 800 V. The device operates within a temperature range of -40°C to +150°C and utilizes an SMTO-218 through-hole package. Key electrical characteristics include a maximum holding current (Ih) of 80 mA, a gate trigger voltage (Vgt) of 1.3 V, and a gate trigger current (Igt) of 100 mA. The non-repetitive peak on-state current is specified at 500 A, with an on-state voltage of 1.6 V and a leakage current of 20 uA.

Triacs Feature Summary

• High thermal stability supporting operation up to +150°C
• Robust surge handling capability with 500 A non-repetitive peak current
• Sensitive gate triggering requiring low drive power

Triacs Applications

• Industrial motor speed control systems
• Solid-state relay modules
• High-power lighting dimmers

Triacs Procurement Notes

Verify the specific suffix 'K4' against the manufacturer's official datasheet to confirm pinout configuration and isolation ratings. Ensure the ordering quantity aligns with factory packaging constraints. Cross-reference the RoHS status and REACH SVHC declarations with the latest regulatory documentation prior to final procurement decisions.

Triacs Selection Notes

Select this component when a 40 A continuous current rating and 800 V blocking voltage are required in an SMTO-218 form factor. Compare the 80 mA holding current against circuit load requirements to prevent unintended turn-off. Verify that the gate drive circuit can supply at least 100 mA to ensure reliable triggering across the full operating temperature range.

Triacs Part Context

This part belongs to the Littelfuse QJxx40xx series of high-current triacs. It shares the 40 A current rating and 800 V voltage class with other variants in the family but differs in specific gate sensitivity and thermal parameters defined by its unique suffix designation.

Triacs Replacement Considerations

Direct substitutes may include the QJ8040K7TP or Q8040K7TP from the same manufacturer, provided the gate trigger specifications and thermal limits match the design requirements.