QJ8012LH5TP

Triacs Overview

The Littelfuse QJ8012LH5TP is a 12A high temperature Alternistor TRIAC with an 800V blocking voltage. It operates in quadrants I, II, and III with a gate trigger current of 50mA maximum. The device features a TO-220 isolated package (L-package) providing 2500VRMS isolation. Key electrical parameters include a maximum on-state voltage of 1.60V at 17.0A peak, a holding current of 50mA maximum, and a non-repetitive surge current capability of 120A at 60Hz. Thermal resistance from junction to case is 2.3°C/W, supporting operation up to a 150°C junction temperature.

Triacs Feature Summary

• Electrically isolated semiconductor device recognized to UL 1557
• High surge handling capability up to 120A for AC power control
• Operates in three quadrants (I, II, & III) for high commutation performance
• Glass-passivated junctions for enhanced reliability

Triacs Applications

• Heater control systems
• Motor speed control circuits
• Lighting controls and dimmers
• Static switching relays
• Power tools and home appliances

Triacs Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to confirm the exact package type and sensitivity rating. Ensure that the procurement documentation matches the required isolation specifications for the intended application environment. Cross-reference the part number with Littelfuse's latest product selector guide to validate availability and compliance status before finalizing orders.

Triacs Selection Notes

Select this component for applications requiring high thermal management and surge handling in AC power control. The L-package provides necessary isolation for heat sinking without electrical connection to the tab. Consider the 50mA gate sensitivity when designing drive circuits. Evaluate thermal resistance values to ensure adequate heat dissipation for continuous RMS current loads within the specified temperature range.

Triacs Part Context

This part belongs to the QJ8012xHx series of 12 Amp High Temperature Alternistor Triacs. The series includes variants with different packages such as TO-220R, TO-220L, and TO-263 D²-PAK. The 'L' designation specifically indicates the isolated TO-220 package variant, distinguishing it from non-isolated versions within the same current and voltage rating family.

Triacs Replacement Considerations

Direct substitutes within the same series include QJ8012RH5TP (non-isolated TO-220) or QJ8012NH5TP (TO-263). Verify that any replacement maintains the required 2500VRMS isolation if present in the original design. Check gate sensitivity ratings to ensure compatibility with existing control circuitry.