Q4004R4

Triacs Overview

The Littelfuse Q4004R4 is a four-quadrant triac belonging to the Teccor Qxx04xx series, designed for general-purpose AC power control applications. It features a TO-252-3 (DPAK) surface-mount package with three terminals. The device supports an RMS on-state current of 4 A and a repetitive peak off-state voltage of 400 V. Key electrical characteristics include a maximum gate trigger current of 25 mA and a gate trigger voltage of 2.5 V. It operates within a temperature range of -40°C to +125°C and exhibits a peak on-state voltage of 1.6 V.

Triacs Feature Summary

• Four-quadrant triggering capability ensures reliable operation across all gate signal polarities.
• Surface-mount DPAK packaging facilitates automated assembly and compact circuit board layouts.
• High thermal stability allows continuous operation at junction temperatures up to 125°C.

Triacs Applications

• Solid-state relays requiring compact switching elements
• General-purpose AC motor speed control circuits
• Lighting dimmer modules for residential or commercial fixtures

Triacs Procurement Notes

Verify the specific suffix 'R4' against official Littelfuse documentation to confirm tape-and-reel packaging specifications. Ensure the ordering part number matches the exact electrical ratings required for the target application. Cross-reference datasheet revisions to confirm compliance with current environmental standards such as RoHS and REACH before finalizing procurement.

Triacs Selection Notes

Select this component when a 4 A RMS current rating and 400 V blocking voltage are sufficient for the load. The TO-252-3 package requires appropriate PCB copper area for thermal dissipation. Compare gate trigger sensitivity requirements against the 25 mA specification to ensure compatibility with the driving circuit. Consider alternative packages if through-hole mounting is mandatory for mechanical robustness.

Triacs Part Context

This triac is part of the broader Teccor Qxx04xx family, which standardizes pinouts and electrical characteristics across various voltage ratings. The Q4004R4 specifically addresses the 400 V segment of this lineup. It shares design similarities with other devices in the series, allowing for modular design approaches in power control systems where different voltage levels are needed.

Triacs Replacement Considerations

Direct replacements must match the 4 A / 400 V / TO-252-3 configuration. Verify that substitute components offer equivalent four-quadrant triggering and similar gate trigger parameters to maintain circuit performance without redesign.