QJ8030RH4TP

Overview

The QJ8030RH4TP is a 30A high temperature Alternistor TRIAC manufactured by Littelfuse, housed in a TO-220AB non-isolated package. It features an 800V rated repetitive off-state voltage and supports operation across quadrants I, II, and III. The device handles a maximum junction temperature of 150°C and offers a surge current capability of 350A at 60Hz. Key electrical parameters include a gate trigger current of 35mA, a holding current of 60mA maximum, and an on-state voltage of 1.5V. Thermal resistance from junction to case is specified at 1.0°C/W.

Feature Summary

• High thermal stability with a maximum junction temperature rating of 150°C for robust performance in demanding environments.
• Enhanced surge handling capability supporting up to 350A peak non-repetitive on-state current at 60Hz.
• Mechanically and thermally robust construction utilizing a clip-attach assembly within the TO-220 package.
• Operates effectively in quadrants I, II, and III, providing high commutation capability for inductive loads.

Applications

• Heater control systems including coffee brewers, tankless water heaters, and infrared heaters
• AC solid-state relays requiring reliable switching
• Light dimmers for incandescent and LED lighting applications
• Motor speed control in kitchen appliances, power tools, and white goods

Procurement Notes

Verify the manufacturer designation as Littelfuse, as the component belongs to their product portfolio despite potential distributor listings under other brand names. Confirm the specific suffix RH4 corresponds to the TO-220AB non-isolated mounting tab configuration. Ensure that procurement specifications align with the required 800V blocking voltage and 30A RMS current ratings for the target application design.

Selection Notes

Select this component when applications demand high surge tolerance and elevated operating temperatures up to 150°C. The non-isolated TO-220R package requires careful consideration of mounting insulation if connected to chassis ground. Designers should account for the 1.0°C/W junction-to-case thermal resistance and ensure adequate heat sinking to maintain the junction temperature within safe limits during continuous 30A operation.

Part Context

This part belongs to the QJxx30xH4 series of high temperature Alternistor TRIACs. It shares the same electrical characteristics and physical dimensions as the QJ8030LH4TP, differing primarily in the internal isolation of the mounting tab. The R-package variant connects the mounting tab electrically to the center lead (Gate), whereas the L-package provides electrical isolation between the tab and the leads.

Replacement Considerations

The QJ8030LH4TP serves as a direct functional substitute with identical electrical ratings but features an isolated mounting tab instead of a non-isolated one. Verify that the circuit layout accommodates the electrical connection between the Gate and the mounting tab inherent to the RH4 package type.

FAQ

Does the QJ8030RH4TP operate in all four quadrants?

No, the device operates in quadrants I, II, and III only. It is not designed to operate in quadrant IV.

What is the critical rate of rise of on-state current (di/dt) for this device?

The critical rate of rise of on-state current is specified as 100 A/μs at a junction temperature of 150°C and a frequency of 60Hz.

Is the mounting tab electrically isolated in the QJ8030RH4TP?

No, the RH4 suffix indicates a non-isolated package where the mounting tab is common with the center lead (Gate). Electrical isolation is provided by the LH4 package variant.