QJ4004V3TP

Triacs Overview

The Littelfuse QJ4004V3TP is a bidirectional triac from the QJxx04xx series, rated for 400 V repetitive peak off-state voltage and 4 A RMS on-state current. It utilizes a TO-252-3 (D-Pak) surface-mount package designed for through-hole compatibility. Key electrical parameters include a maximum gate trigger current of 25 mA and a gate trigger voltage of 1.3 V. The device supports an operating temperature range from -40 °C to +150 °C with a maximum junction temperature of 150 °C. On-state voltage is specified at 1.4 V, while leakage current remains at 5 µA under rated conditions.

Triacs Feature Summary

• Integrated diac structure eliminates external components for noise-immune triggering
• Glass-passivated junctions ensure long-term parameter stability and reliability
• Surface-mount D-Pak package facilitates automated assembly processes

Triacs Applications

• AC switching and phase control applications
• Speed controls for motors and fans
• Temperature modulation controls
• Lighting controls requiring high noise immunity

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm pinout and internal circuit configuration. Ensure the ordering part number matches the required thermal and electrical specifications for the target application environment.

Triacs Selection Notes

Select this component when designing circuits requiring integrated noise immunity without discrete diacs. Verify that the PCB footprint accommodates the TO-252-3 package dimensions and that thermal management strategies support the 150 °C maximum junction temperature limit during operation.

Triacs Part Context

This device belongs to the QJxx04xx series of Quadrac devices manufactured by Littelfuse. These components combine a triac and a diac within a single package to simplify AC switching designs. The series targets applications demanding reliable phase control and robust performance in industrial and consumer electronics environments.

Triacs Replacement Considerations

Direct substitutes within the same family include QJ4004D3TP. Cross-series replacements may require verification of gate sensitivity and package compatibility.