QJ8012LH4TP

Triacs Overview

The Littelfuse QJ8012LH4TP is a 12A high-temperature Alternistor TRIAC in an isolated TO-220 package. It features an 800V blocking voltage and 35mA gate trigger current (Quadrants I, II, III). Key electrical parameters include a maximum RMS on-state current of 12A at 120°C case temperature, a non-repetitive surge peak current of 120A at 60Hz, and a junction-to-case thermal resistance of 2.3°C/W. The device operates within a junction temperature range of -40°C to 150°C.

Triacs Feature Summary

• Electrically isolated semiconductor device recognized under UL 1557 with 2500VRMS isolation rating
• High surge handling capability up to 120A for improved thermal management
• Operates in Quadrants I, II, and III with restricted RFI generation
• Glass-passivated junctions for enhanced reliability

Triacs Applications

• AC solid-state switches
• Heater control systems
• Motor speed controls
• Lighting controls and light dimmers
• Static switching relays

Triacs Procurement Notes

Verify the specific suffix 'TP' indicates tube packaging containing 50 units per tube, totaling 1000 units per base pack as documented in the packing options section. Confirm the L-package designation corresponds to the isolated mounting tab configuration. Ensure the H4 sensitivity matches the required 35mA gate trigger specification for the application design.

Triacs Selection Notes

Select this component for applications requiring high commutation performance in extremely inductive loads where snubber circuits are undesirable. The isolated package facilitates ease of heat sinking while maintaining high isolation voltage. Designers should limit continuous current to 75% of the rated value and ensure adequate heat sinking to manage the 2.3°C/W junction-to-case thermal resistance effectively.

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 (non-isolated) and TO-263 D²-PAK, as well as different sensitivities like H5 (50mA). The QJ8012LH4TP specifically denotes the 800V, 12A, 35mA sensitivity model in the isolated TO-220L form factor.

Triacs Replacement Considerations

Compatible substitutes within the same series include QJ8012RH4TP (TO-220R non-isolated) and QJ8012NH4TP (TO-263 D²-PAK). For higher gate sensitivity requirements, the QJ8012LH5TP variant offers 50mA triggering. All share identical electrical ratings but differ in physical package and isolation characteristics.