Q4004F42

Triacs Overview

The Littelfuse Q4004F42 is a four-quadrant triac designed for AC power control applications. It features a 400V repetitive peak off-state voltage and an RMS on-state current rating of 4A. The device utilizes a TO-220AB package with electrical isolation between the leads and the mounting surface, eliminating the need for external insulators. Key electrical parameters include a maximum gate trigger current of 10mA and a peak gate power dissipation of 0.3W. It supports a surge current rating of 55A and operates within a junction temperature range of -40°C to 125°C.

Triacs Feature Summary

• Four-quadrant sensitivity allows reliable triggering from any gate polarity and main terminal voltage combination.
• Integrated thermal isolation in the TO-220AB package removes the requirement for separate insulating hardware during installation.
• Glass-passivated junctions provide long-term parameter stability and enhanced reliability under harsh conditions.

Triacs Applications

• AC motor speed controls
• Lighting dimmer circuits
• Temperature modulation systems

Triacs Procurement Notes

Verify the specific suffix 'F42' against official Littelfuse documentation to confirm tape-and-reel packaging or specific marking variations. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability. Cross-reference the datasheet revision date to align with current manufacturing standards.

Triacs Selection Notes

Select this component when a four-quadrant triac is required for robust phase control in AC circuits. The 4A current rating suits moderate power loads, while the 400V voltage rating fits standard low-voltage AC systems. Consider the TO-220 package for through-hole mounting where heat sinking capabilities are necessary for sustained operation.

Triacs Part Context

This part belongs to the Littelfuse Teccor family of silicon controlled rectifiers and triacs. The Q-series specifically denotes Quadrac devices, which integrate a diac trigger mechanism within the same package. This integration simplifies circuit design by reducing component count and assembly time compared to discrete triac-diac combinations.

Triacs Replacement Considerations

Direct replacements must match the 4A/400V specifications and four-quadrant sensitivity. Verify that substitute components offer equivalent isolation voltage ratings for the TO-220 package. Consult Littelfuse application notes for pin-compatible alternatives if physical footprint constraints exist.