Q4012LH5TP

Triacs Overview

The Littelfuse Q4012LH5TP is a four-quadrant triac belonging to the Qxx10xHx series, designed for AC power control applications. It features a TO-220-2 package and supports a repetitive peak off-state voltage of 400V with a root-mean-square on-state current rating of 12A. The device exhibits a maximum gate trigger voltage of 50mA and maintains a low holding current characteristic. Key electrical parameters include an on-state voltage drop of 1.6V and a maximum off-state leakage current of 10uA under specified conditions. This component provides robust switching capabilities within its thermal and electrical limits.

Triacs Feature Summary

• Four-quadrant triggering capability ensures reliable operation across all gate signal polarities.
• High surge current handling capacity suitable for inductive load switching.
• Integrated heat sink mounting tab facilitates efficient thermal dissipation in power modules.

Triacs Applications

• Solid-state relays requiring high current isolation
• Industrial motor speed control circuits
• Lighting dimmer systems for commercial loads

Triacs Procurement Notes

Verify the specific suffix LH5TP against the manufacturer's latest datasheet to confirm pinout compatibility and insulation class requirements. Ensure that the ordering documentation explicitly references the Q4012LH5TP part number to avoid confusion with similar current ratings in the Qxx10xHx family. Cross-reference the package dimensions with your PCB layout constraints before finalizing procurement orders.

Triacs Selection Notes

Select this component when a 12A RMS current rating at 400V blocking voltage is required in a TO-220-2 form factor. Compare the 1.6V on-state voltage drop against alternative devices to evaluate conduction losses in your specific thermal design. Verify that the gate trigger characteristics align with your driving circuit's output capabilities for consistent switching performance.

Triacs Part Context

This triac belongs to the Qxx10xHx series from Littelfuse, which offers various current ratings within the same package style. The Q4012 variant specifically bridges the gap between lower current models like the Q4010 and higher current options such as the Q4030. This series is engineered for general-purpose AC power switching where reliability and compact packaging are prioritized.

Triacs Replacement Considerations

Direct replacements must match the 12A/400V specification and TO-220-2 package. Check equivalent parts from other manufacturers for identical pin configurations and thermal resistance values to ensure seamless integration without redesigning the heatsink interface.

Triacs FAQ

What is the maximum repetitive peak off-state voltage for the Q4012LH5TP?

The maximum repetitive peak off-state voltage (VDRM) is rated at 400V.

Does the Q4012LH5TP support four-quadrant triggering?

Yes, it is a four-quadrant triac capable of being triggered by both positive and negative gate currents.

What is the typical on-state voltage drop at full load?

The on-state voltage (VT) is typically 1.6V at the rated on-state current.