Q4004L3

Triacs Overview

The Littelfuse Q4004L3 is a four-quadrant triac from the Teccor Qxx04xx series, rated for 4 A RMS on-state current and 400 V repetitive peak off-state voltage. It utilizes a TO-220 package with an electrically isolated tab capable of withstanding 2500 V rms between leads and the mounting surface. The device features glass-passivated junctions for parameter stability and operates within a temperature range of -40°C to +125°C. Key electrical characteristics include a maximum gate trigger current of 25 mA, a holding current of 20 mA, and a non-repetitive surge current rating of 55 A.

Triacs Feature Summary

• Integrated isolation in the TO-220 package eliminates the need for external insulators.
• Glass-passivated junctions ensure long-term reliability and parameter stability.
• Four-quadrant sensitivity allows triggering with either polarity of gate signal or main terminal voltage.

Triacs Applications

• AC phase control circuits
• Lighting dimmer applications
• Speed control systems

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm exact electrical tolerances and packaging variations. Ensure the procurement channel provides valid traceability for the Teccor brand component. Confirm that the TO-220 isolation specifications meet the system's safety requirements before finalizing orders.

Triacs Selection Notes

Select this component when high-voltage isolation is required without additional hardware. The 4 A current rating suits moderate power AC loads. Verify that the 400 V blocking voltage aligns with the circuit's peak line voltage. Consider the thermal management needs associated with the TO-220 form factor for continuous operation.

Triacs Part Context

This part belongs to the Littelfuse Teccor Qxx04xx series of quadracs. These devices integrate a diac trigger mechanism within the triac package to simplify circuit design. The series offers various voltage ratings up to 600 V and current capacities ranging from 4 A to 15 A, providing standardized solutions for AC switching.

Triacs Replacement Considerations

Direct replacements must match the 4 A / 400 V rating and TO-220 isolation profile. Verify pinout compatibility and gate trigger characteristics. Cross-reference with other manufacturers' quadric diacs offering similar integrated trigger functionality and thermal performance.

Triacs FAQ

What is the isolation voltage capability of the TO-220 package?

The package provides electrical isolation of 2500 V rms between the leads and the mounting surface.

Does the Q4004L3 require an external snubber network?

No, the integrated diac trigger simplifies the design, though standard snubber practices may still apply depending on the specific load conditions.

What is the maximum operating temperature?

The device is rated for a maximum operating temperature of +125°C.