Q4012LH2

Triacs Overview

The Q4012LH2 is a Quadrac device manufactured by Littelfuse, integrating a triac and an internal diac trigger within a single package. This component functions as a bidirectional AC switch with gate control for either polarity of main terminal voltage. It is designed for AC switching and phase control applications requiring noise immunity. The device features glass-passivated junctions to ensure long-term reliability and parameter stability. It eliminates the need for external discrete diacs, reducing assembly time and cost.

Triacs Feature Summary

• Integrates a triac and a diac trigger in one package
• Bidirectional AC switching capability
• Gate controlled for either polarity of main terminal voltage
• Glass-passivated junctions for reliability

Triacs Applications

• Speed controls
• Temperature modulation controls
• Lighting controls

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm exact electrical ratings and package variations. Ensure the selected variant matches the required voltage and current specifications for the target application. Cross-reference part numbers with authorized distributors to avoid counterfeit components.

Triacs Selection Notes

Select this component for applications requiring integrated triac-diac functionality without external snubber networks if using the LH variant. Consider the TO-220 package isolation requirements. Evaluate thermal management needs based on the on-state current rating. Confirm compatibility with the control circuit's gate drive characteristics.

Triacs Part Context

This part belongs to the QxxxxLTx series of Teccor brand Quadrac devices. These devices are developed by Littelfuse to simplify AC control circuits by combining two components into one. The series offers various current capacities and voltage ranges to suit different power control needs.

Triacs Replacement Considerations

Check for direct substitutes within the QxxxxLTx series or other Triac-Diac combinations from Littelfuse. Verify pinout compatibility and electrical parameters before substitution. Consult manufacturer datasheets for equivalent parts.