SJ6020L1ATP

Overview

The Littelfuse SJ6020L1ATP is a high junction temperature Silicon-Controlled Rectifier (SCR) from the SJxx20xxA series, rated for 600 V repetitive peak off-state voltage and 20 A RMS on-state current. It utilizes an isolated TO-220L package to facilitate heat sinking while maintaining electrical isolation between the mounting tab and the cathode. The device features a sensitive gate trigger with a maximum gate current of 6 mA at approximately 1.5 V. It supports a maximum operating junction temperature of 150 °C and offers a peak non-repetitive surge current capability of 300 A at 60 Hz.

Feature Summary

• Isolated TO-220L package design enables direct thermal management via mounting hardware without requiring additional insulators.
• High junction temperature rating up to 150 °C provides robust operation in environments with limited cooling capacity or occasional overloads.
• Sensitive gate architecture allows reliable triggering using minimal gate drive current, facilitating direct interfacing with microprocessors.

Applications

• AC generator rectifiers
• Battery voltage regulators
• Inrush current controllers

Procurement Notes

Verify component authenticity by inspecting the marking code 'SJ6020L1A' against the official Littelfuse part numbering system. Confirm that the ordering suffix 'TP' corresponds to tube packaging as specified in the datasheet. Ensure the procurement documentation explicitly references the SJxx20xxA series revision to guarantee compliance with the stated electrical characteristics and AEC-Q101 qualification standards.

Selection Notes

Select this component when an isolated SCR topology is required for phase control or rectification applications. The 6 mA gate sensitivity distinguishes it from standard variants, making it suitable for low-power driver circuits. Verify that the application's thermal environment remains within the 150 °C junction limit and that the 600 V blocking voltage exceeds the circuit's peak reverse voltage requirements.

Part Context

This device belongs to the SJxx20xxA family of 20 Amp high junction temperature SCRs manufactured by Littelfuse. The series encompasses various voltage ratings and gate sensitivities packaged in TO-220L, TO-220R, and TO-263 configurations. The SJ6020L1ATP specifically combines the 600 V rating with the isolated L-package and 6 mA sensitivity variant.

Replacement Considerations

Direct replacements within the same series include SJ6020R1ATP (non-isolated TO-220R) and SJ4020L1ATP (400 V rating). Cross-series substitution requires careful evaluation of thermal resistance differences and gate trigger specifications to ensure circuit compatibility.

FAQ

What is the maximum allowable torque for the mounting tab?

The maximum torque to be applied to the mounting tab is 8 in-lbs (0.904 Nm).

How does the gate sensitivity vary with junction temperature?

The DC gate trigger current increases as the junction temperature decreases, as illustrated in the normalized DC gate trigger current versus junction temperature graph in the datasheet.

What is the thermal resistance from junction to case?

For the SJxx20LxA series, the thermal resistance from junction to case is 2.4 °C/W.