Q4015LT58

Triacs Overview

The Littelfuse Q4015LT58 is a Quadrac device, which integrates a triac and a diac trigger within a single package. It functions as a bidirectional AC switch with gate control for either polarity of main terminal voltage. The component features an on-state current capacity of 15A and a maximum repetitive peak off-state voltage (VDRM) of 400V. It utilizes a TO-220 package that provides electrical isolation of 2500V rms from the leads to the mounting surface. The device incorporates glass-passivated junctions to ensure long-term reliability and parameter stability.

Triacs Feature Summary

• Integrated Diac Trigger: Combines a triac and a diac in one package to eliminate the need for discrete components and assembly time.
• High Voltage Isolation: The TO-220 package offers 2500V rms isolation between leads and the mounting surface, removing the requirement for external insulators.
• Glass-Passivated Junctions: Utilizes glass-passivated technology to maintain device reliability and parameter stability over time.

Triacs Applications

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

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm exact voltage ratings and packaging variations. Ensure the selected part matches the required isolation voltage and thermal management specifications for the target application environment.

Triacs Selection Notes

Select this component for applications requiring integrated triac-diac functionality without external snubber networks. Consider the 400V rating and 15A current capacity when designing circuits for moderate power AC loads. Verify compatibility with the TO-220 package constraints regarding mounting surface isolation requirements.

Triacs Part Context

This part belongs to the Teccor QxxxxLTx series of Quadrac devices developed by Littelfuse. These devices are designed to simplify circuit design by replacing separate triac and diac assemblies. The series covers various current and voltage ratings, typically ranging from 4A to 15A and 200V to 600V, all housed in electrically isolated TO-220 packages.

Triacs Replacement Considerations

Direct substitutes must be verified through Littelfuse cross-reference tools. Generic triacs require additional discrete diac components and potentially snubber networks, altering the board layout and assembly process. No public substitute part numbers are confirmed.