Q4004L359

Triacs Overview

The Littelfuse Q4004L359 is a Quadrac device, which integrates a triac and a diac trigger within a single TO-220 package. It serves as a bidirectional AC switch with gate control for either polarity of main terminal voltage. The component features an on-state current rating of 4 A and a repetitive peak off-state voltage capability up to 400 V. Designed for noise immunity, it eliminates the need for external discrete diacs or snubber networks. The TO-220 package provides electrical isolation of 2500 V rms from leads to the mounting surface, removing the requirement for separate insulators.

Triacs Feature Summary

• Integrated diac trigger mechanism eliminates external components
• Bidirectional switching with gate control for both voltage polarities
• High voltage isolation via electrically isolated TO-220 package

Triacs Applications

• AC speed controls
• Temperature modulation controls
• Lighting controls requiring noise immunity

Triacs Procurement Notes

Verify the specific suffix '359' against official Littelfuse documentation to confirm exact pinout and isolation specifications. Ensure the selected variant matches the required voltage and current ratings for the target application. Cross-reference datasheets to validate package dimensions and thermal characteristics before integration.

Triacs Selection Notes

Select this component for applications requiring integrated phase control without discrete triggering circuits. The built-in diac simplifies design by reducing assembly steps and component count. Consider the 2500 V rms isolation when designing circuits where mounting surface connectivity must be avoided. Verify that the 4 A current rating meets the load requirements.

Triacs Part Context

This part belongs to the Teccor QxxxxLTx series of Quadrac devices developed by Littelfuse. These devices combine a triac and a diac in one package to save expense and assembly time. The series offers current capacities ranging from 4 A to 15 A and voltage ranges from 200 V to 600 V, all housed in electrically isolated TO-220 packages with glass-passivated junctions for reliability.

Triacs Replacement Considerations

Direct substitutes include other parts from the QxxxxLTx series with matching current and voltage ratings. Generic Triac-Diac combinations can replace this unit if external components are added. Verify that any replacement maintains the same isolation voltage and package type for mechanical compatibility.