SJ4020RATP

Scrs Overview

The Littelfuse SJ4020RATP is a Silicon Controlled Rectifier (SCR) from the SJxx20xx series, designed for through-hole mounting in TO-220-2 packages. It features a rated repetitive off-state voltage of 400 V and an RMS on-state current capability of 20 A. The device exhibits a forward voltage drop of 1.6 V at conduction, with a gate trigger voltage of 1.5 V and a gate trigger current of 35 mA. Leakage current under off-state conditions is limited to 10 uA, while the holding current maximum is 75 mA. It supports non-repetitive on-state currents up to 300 A and operates within a temperature range of -40 C to +150 C. The component holds AEC-Q101 qualification.

Scrs Feature Summary

• AEC-Q101 qualified for automotive reliability standards
• High thermal stability with extended operating temperature range
• Robust surge handling capability for transient protection

Scrs Applications

• Automotive power control circuits
• Industrial motor drive systems
• AC power switching applications

Scrs Procurement Notes

Verify the specific ordering suffix against official Littelfuse documentation to ensure correct packaging and variant selection. Confirm that the TO-220-2 package dimensions align with the target PCB layout requirements. Cross-reference the AEC-Q101 certification status if the application mandates strict automotive grade compliance. Ensure the 400V voltage rating provides adequate margin for the specific circuit operating conditions.

Scrs Selection Notes

Select this SCR when a 400V blocking voltage and 20A continuous current are required in a standard through-hole configuration. The TO-220-2 package facilitates effective heat dissipation for moderate power levels. Consider the 1.6V forward voltage drop for efficiency calculations in high-current paths. Verify that the 35mA gate trigger current matches the driving circuit's output capabilities.

Scrs Part Context

This component belongs to the SJxx20xx series of thyristors manufactured by Littelfuse. The series is engineered for general-purpose power control and protection tasks. The SJ4020RATP specifically denotes the 400V, 20A variant within this family, standardized for industrial and automotive environments requiring reliable silicon-controlled rectification.

Scrs Replacement Considerations

Consult Littelfuse official substitution guides for direct equivalents. Verify pinout compatibility and thermal resistance values before replacing with other manufacturers' TO-220-2 SCRs.