Q4040J7TP

Triacs Overview

The Littelfuse Q4040J7TP is a bidirectional triac from the Qxx40xx series, designed for AC power control applications. It features a rated repetitive off-state voltage (VDRM) of 400 V and an on-state RMS current (It RMS) of 40 A. The device supports non-repetitive on-state currents of 335 A and 400 A, with a maximum on-state voltage of 1.8 V. Gate triggering parameters include a voltage (Vgt) of 2.5 V and current (Igt) of 100 mA. It operates within a temperature range of -40°C to +125°C and is housed in an SMTO-218 through-hole package.

Triacs Feature Summary

• High current handling capability with 40 A RMS rating for robust AC switching
• Sensitive gate trigger characteristics facilitating direct interface with logic circuits
• Industrial-grade thermal stability supporting operation up to 125°C

Triacs Applications

• Solid-state relays requiring compact AC load switching
• Motor speed control systems for industrial equipment
• Lighting dimmer circuits for commercial and residential use

Triacs Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number Q4040J7TP with official Littelfuse documentation. Confirm that the specific suffix indicates the correct voltage rating variant, as similar models exist within the same series. Ensure compliance with RoHS and REACH standards required for your region before finalizing procurement orders.

Triacs Selection Notes

Select this component when a 400 V blocking voltage is sufficient for the application, distinguishing it from higher voltage variants like the Q6040J7TP or lower voltage options. The 40 A RMS rating suits moderate power loads. Verify that the SMTO-218 package fits the PCB layout constraints and that the 100 mA gate drive current aligns with the available control circuitry capabilities.

Triacs Part Context

This triac belongs to the Qxx40xx family, which shares common physical dimensions and thermal characteristics. While other members like Q6040J7TP offer 600 V ratings, the Q4040J7TP specifically targets 400 V applications. All variants in this series maintain identical pinouts and mounting styles, simplifying board design updates across different voltage requirements.

Triacs Replacement Considerations

Direct substitutes within the same series include Q6040J7TP for higher voltage tolerance or Q8040J7TP for even greater blocking capability. Lower voltage alternatives such as Q4040K7TP may be considered if system voltages are reduced, though gate characteristics should be re-evaluated for compatibility.