SJ4020L1ATP

Scrs Overview

The Littelfuse SJ4020L1ATP is a Silicon Controlled Rectifier (SCR) from the SJxx20xx series, designed for high-temperature environments. It features a rated repetitive off-state voltage of 400 V and an on-state RMS current of 20 A. The device operates within a temperature range of -40°C to +150°C and utilizes a TO-220-2 through-hole package. Key electrical parameters include a forward voltage of 1.6 V, a gate trigger voltage of 1.5 V, and a gate trigger current of 10 mA. It exhibits a maximum holding current of 35 mA and supports a non-repetitive peak on-state current of 300 A.

Scrs Feature Summary

• AEC-Q101 qualified for automotive reliability standards
• High junction temperature capability up to 150°C
• Integrated diac trigger functionality for simplified AC control

Scrs Applications

• AC motor speed controls
• Temperature modulation systems
• Lighting control circuits

Scrs Procurement Notes

Verify the specific suffix 'ATP' against official Littelfuse documentation to confirm AEC-Q101 qualification and exact gate trigger specifications. Ensure the ordering part number matches the required thermal and electrical ratings for the target application environment.

Scrs Selection Notes

Select this component when an integrated Quadrac solution is preferred over discrete triac-diac assemblies. The built-in trigger mechanism eliminates external snubber networks and reduces assembly complexity. Confirm that the 400V voltage rating and 20A current capacity align with the load requirements.

Scrs Part Context

This device belongs to the Teccor QxxxxLTx series of Quadracs, which combine a triac and a diac in a single package. These devices are bidirectional AC switches designed for phase control applications where noise immunity is critical. The TO-220 package provides electrical isolation between leads and the mounting surface.

Scrs Replacement Considerations

Direct substitutes include other SJ4020 variants such as SJ4020L1TP or SJ4020L2ATP. Verify that any replacement maintains the same voltage, current, and thermal ratings while matching the specific gate trigger characteristics.