QJ8012RH4TP

Triacs Overview

The Littelfuse QJ8012RH4TP is a 12A high temperature Alternistor TRIAC in the QJxx12xHx series, housed in a TO-220AB non-isolated package. It features an RMS on-state current of 12 A and rated blocking voltages (VDRM/VRRM) of 800 V. The device operates in quadrants I, II, and III with a maximum gate trigger current (IGT) of 35 mA. Key electrical parameters include a maximum on-state voltage of 1.60 V at 17.0 A peak, a holding current maximum of 40 mA, and a non-repetitive surge peak on-state current (ITSM) of 120 A at 60 Hz. Thermal resistance from junction to case is 1.2 °C/W, supporting operation within a junction temperature range of -40°C to +150°C.

Triacs Feature Summary

• Alternistor technology enables high commutation performance for extremely inductive loads without requiring snubber circuits.
• Glass-passivated junctions provide robust protection against environmental stress and electrical transients.
• Electrically isolated semiconductor device recognized under UL 1557 standards for safety compliance.

Triacs Applications

• AC solid-state switching and phase control applications
• Heater control systems and lighting controls
• Motor speed control circuits
• Static switching relays

Triacs Procurement Notes

Verify the specific ordering suffix 'TP' corresponds to the tube pack configuration containing 1000 units per base quantity. Confirm that the 'R' designation matches the required TO-220AB non-isolated mounting tab common with center lead physical dimensions. Ensure the 35 mA gate sensitivity aligns with the driver circuit capabilities before finalizing procurement orders.

Triacs Selection Notes

Select this component when high thermal management capability and surge handling are critical for AC power control. The 3-quadrant operation supports versatile gate drive configurations compared to standard triacs. Verify that the 1.2 °C/W junction-to-case thermal resistance meets the system's heat sinking requirements for continuous 12 A operation at elevated ambient temperatures.

Triacs Part Context

This part belongs to the QJxx12xHx series of 12 Amp High Temperature Alternistor Triacs manufactured by Littelfuse. The series includes variants with different packages such as TO-220L (isolated), TO-220R (non-isolated), and TO-263 D²-PAK. The 'QJ' prefix identifies it as a high junction temperature thyristor or alternistor designed for demanding industrial environments.

Triacs Replacement Considerations

Compatible substitutes within the same family include QJ8012RH5TP, which shares identical electrical ratings but utilizes 50 mA gate sensitivity. Other package alternatives like QJ8012NH4TP offer surface mount options while maintaining the same 35 mA sensitivity and 800V/12A specifications.