Q2012LH5

Triacs Overview

The Littelfuse Q2012LH5 is a Triac from the Qxx12xhx series, designed for AC switching and phase control applications. It features an isolated TO-220L package with a voltage rating of 1000 V and an on-state current (ITRMS) of 12 A. The device operates in the first, second, and third quadrants, offering high dv/dt capability without requiring a snubber network. Key electrical parameters include a maximum repetitive peak off-state voltage (VDRM) of 1000 V, a non-repetitive surge current (ITSM) of 120 A, and a gate trigger current (IGT) of up to 50 mA. It includes a glass-passivated junction for reliability.

Triacs Feature Summary

• Bidirectional AC switch capable of operation in the first, second, and third quadrants
• High dv/dt capability eliminates the need for external snubber networks
• Electrically isolated TO-220L package with UL certification for enhanced safety
• Glass-passivated junction ensures long-term parameter stability

Triacs Applications

• AC power switching and static relay circuits
• Phase control for motor speed regulation
• Temperature modulation and heating controls
• Lighting dimming systems

Triacs Procurement Notes

Verify the specific datasheet version for the Q2012LH5 part number to confirm exact thermal resistance values and mounting torque specifications. Ensure that the selected heat sink solution accommodates the TO-220L package dimensions and isolation requirements. Cross-reference the ordering suffix with manufacturer documentation to confirm pinout configuration and insulation class compliance before finalizing procurement orders.

Triacs Selection Notes

Select this component for applications requiring robust AC phase control with high voltage blocking capabilities. The 12 A RMS rating suits moderate power loads, while the 1000 V breakdown voltage provides margin for inductive kickback. Consider the isolated tab design when designing PCB layouts to ensure proper grounding and thermal dissipation paths are established without compromising electrical isolation standards.

Triacs Part Context

This Triac belongs to the Qxx12xhx series by Littelfuse, which focuses on high-performance switching thyristors. The series is engineered for demanding environments where reliable AC switching is critical. The Q2012LH5 variant specifically utilizes the TO-220L package to provide electrical isolation between the main terminals and the mounting surface, distinguishing it from non-isolated alternatives in the broader product line.

Triacs Replacement Considerations

Direct replacements within the same series include other Qxx12xhx variants with different voltage ratings or current capacities. Verify pin compatibility and thermal characteristics when substituting with similar TO-220L Triacs from other manufacturers to ensure equivalent performance in phase control circuits.