Q4010L555

Triacs Overview

The Littelfuse Q4010L555 is an Alternistor TRIAC designed for high-reliability power control applications. It features a breakover voltage of 400V and supports a root-mean-square on-state current of 10A. The device utilizes a TO-220AB flange mount package with three terminals, ensuring isolated case connection for effective thermal management. Operating within a temperature range from -40°C to 125°C, it meets UL recognition standards. Key electrical characteristics include a maximum gate trigger current of 50mA and a holding current of 50mA, providing robust switching capabilities in industrial environments.

Triacs Feature Summary

• Alternistor technology provides enhanced dv/dt immunity and reliable commutation compared to standard triacs.
• Flange mount construction facilitates efficient heat dissipation for high-current operations.
• Isolated case design allows direct mounting to heatsinks without additional insulating hardware.

Triacs Applications

• Industrial motor speed control systems
• Solid-state relay (SSR) modules
• High-power lighting dimmers

Triacs Procurement Notes

Verify the specific suffix '555' against official Littelfuse documentation to confirm pinout configuration and exact mechanical dimensions. Ensure the selected variant matches the required thermal resistance specifications for the target application's heatsink design. Cross-reference datasheet revisions to confirm compliance with current RoHS and REACH regulations before finalizing procurement orders.

Triacs Selection Notes

Select this component when high dv/dt immunity and rugged commutation are critical for the circuit design. The 10A RMS rating suits moderate-to-high power loads requiring precise phase-angle control. Consider the TO-220AB package for applications where board space permits flange mounting to maximize thermal performance and reliability under continuous load conditions.

Triacs Part Context

This part belongs to the Qxx10xx series of Alternistor TRIACs manufactured by Littelfuse. These devices are engineered to replace conventional triacs in demanding applications, offering superior performance in terms of switching speed and noise immunity. The series is widely utilized in industrial power control modules where long-term stability and low failure rates are paramount.

Triacs Replacement Considerations

Direct replacements may include other 400V 10A Alternistor TRIACs from Littelfuse or compatible equivalents from manufacturers like STMicroelectronics or Vishay, provided they match the TO-220AB package and electrical ratings. Verify that substitute parts offer equivalent or better dv/dt ratings and gate trigger characteristics to ensure circuit compatibility.