Q4025L659

Triacs Overview

The Littelfuse Q4025L659 is a Quadrac device from the Teccor brand, integrating 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 glass-passivated junctions to ensure long-term reliability and parameter stability. It is designed for AC switching and phase control applications requiring noise immunity. The device operates with a peak repetitive off-state voltage (VDRM) of 600 V and an on-state RMS current (ITRMS) of 4 A. It is housed in a TO-220 package, which provides electrical isolation of 2500 V rms from the leads to the mounting surface.

Triacs Feature Summary

• Integrated Triac and Diac: Combines a triac and a diac trigger in one package to save assembly time and cost.
• Bidirectional AC Switching: Gate controlled for either polarity of main terminal voltage for versatile AC control.
• High Voltage Isolation: TO-220 package offers 2500 V rms isolation between leads and mounting surface.

Triacs Applications

• Speed controls
• Temperature modulation controls
• Lighting controls

Triacs Procurement Notes

Verify the specific part number suffix against official Littelfuse documentation to confirm exact ratings and packaging options. Ensure the selected variant meets the required voltage and current specifications for the target application. Check for RoHS compliance status if environmental regulations apply. Confirm availability through authorized distributors or direct manufacturer channels.

Triacs Selection Notes

Select this component for applications requiring integrated triac-diac functionality without external snubber networks. Consider the 600 V voltage rating and 4 A current capacity for moderate power AC loads. The TO-220 package facilitates heat dissipation and easy mounting. Verify that the 2500 V rms isolation is sufficient for the system's safety requirements.

Triacs Part Context

The Q4025L659 belongs to the QxxxxLTx series of Quadrac devices developed by Littelfuse under the Teccor brand. This series is designed to simplify circuit design by eliminating the need for discrete diacs and separate insulators. The family includes variations available for custom design applications upon consultation with the factory.

Triacs Replacement Considerations

Direct replacements must match the 600 V, 4 A rating and TO-220 package. Verify compatibility with existing PCB layouts and thermal management solutions. Consult Littelfuse for alternative part numbers within the QxxxxLTx series or equivalent products from other manufacturers.