Q4040K5TP

Triacs Overview

The Littelfuse Q4040K5TP is a bidirectional triac from the Qxx40xx series, designed for high-voltage power control applications. It features a 1 kV rated repetitive off-state voltage and supports an RMS on-state current of 40 A. The device utilizes an Alternistor structure with isolation, housed in a TO-218AC (SMTO-218) through-hole package. Key electrical parameters include a maximum gate trigger current of 50 mA and a holding current of 75 mA. It operates within a junction temperature range of -40°C to +125°C and offers non-repetitive surge currents of 335 A or 400 A depending on the waveform.

Triacs Feature Summary

• Alternistor technology providing high dv/dt immunity without external snubber circuits
• Isolated construction for enhanced safety in high-voltage switching environments
• Robust thermal performance suitable for demanding industrial power control loads

Triacs Applications

• High-voltage AC motor speed control systems
• Industrial heating element regulation
• Solid-state relays requiring high blocking voltage

Triacs Procurement Notes

Verify the specific suffix 'K5' against official Littelfuse documentation to confirm the 1 kV rating, as similar part numbers may denote different voltage classes. Ensure the ordering quantity aligns with manufacturer standard packaging requirements. Cross-reference the datasheet revision date to guarantee compliance with current RoHS and REACH standards before finalizing procurement.

Triacs Selection Notes

Select this component when circuit design requires a 1 kV blocking voltage combined with 40 A continuous current handling. The TO-218AC package facilitates efficient heat dissipation for through-hole mounting. Verify that the gate drive circuit can supply the specified 50 mA trigger current. Consider the thermal resistance characteristics if operating near the maximum junction temperature limit.

Triacs Part Context

This triac belongs to the Qxx40xx family, which specializes in high-voltage Alternistor devices. These components are engineered to replace traditional SCR-based solutions in applications demanding higher reliability and simpler driving circuits. The series is widely utilized in industrial power electronics where robust performance under harsh electrical conditions is critical.

Triacs Replacement Considerations

Direct replacements must match the 1 kV voltage rating, 40 A current capacity, and TO-218AC package. Verify equivalent gate trigger characteristics and thermal specifications. Consult Littelfuse application notes for pin-compatible alternatives within the same product line.