Q8040K5TP

Triacs Overview

The Littelfuse Q8040K5TP is a bidirectional triac from the Qxx40xx series, designed for high-power switching applications. It features an RMS on-state current of 40 A and a rated repetitive off-state voltage (VDRM) of 800 V. The device operates within a junction temperature range of -40°C to +125°C and utilizes an SMTO-218 through-hole package with isolation. Key electrical parameters include a maximum non-repetitive peak on-state current of 335 A or 400 A, a maximum holding current of 120 mA, and a gate trigger voltage of 2.5 V. The on-state voltage is specified at 1.8 V, with a maximum off-state leakage current of 20 uA.

Triacs Feature Summary

• High-voltage blocking capability suitable for demanding AC power control environments
• Robust thermal performance with a maximum operating junction temperature of 125°C
• Integrated isolation in the SMTO-218 package for enhanced safety and mounting flexibility

Triacs Applications

• Industrial motor speed control systems
• Solid-state relay designs requiring high voltage isolation
• AC power regulation circuits in heavy machinery

Triacs Procurement Notes

Verify the specific suffix K5 against official Littelfuse documentation to confirm exact gate trigger characteristics and thermal ratings. Ensure compatibility with existing PCB footprints for the SMTO-218 isolated package. Confirm RoHS compliance status via the manufacturer's latest datasheet before finalizing procurement specifications.

Triacs Selection Notes

Select this component when an 800 V rating and 40 A continuous current are required. Compare the 2.5 V gate trigger voltage against driver capabilities. Consider the 125°C junction limit for thermal management design. Verify that the 335 A/400 A surge rating meets circuit fault protection requirements.

Triacs Part Context

This part belongs to the Littelfuse Qxx40xx series of Alternistors. These devices are engineered for high reliability in industrial power control. The Q8040K5TP shares the series' core architecture but differs in gate sensitivity and voltage thresholds compared to other variants like the Q8040J7TP.

Triacs Replacement Considerations

Direct substitutes may include other 800 V, 40 A triacs in TO-218 packages. Verify pinout compatibility and thermal resistance values. Check if alternative parts meet the same 125°C junction temperature and isolation requirements.