SJ4012RTP

Overview

The Littelfuse SJ4012RTP is a Silicon Controlled Rectifier (SCR) from the SJxx12xx series, designed for high-temperature applications. It features a rated repetitive off-state voltage of 400 V and an on-state RMS current of 12 A. The device operates within a junction temperature range of -40°C to +150°C. Key electrical parameters include a maximum holding current of 40 mA, a gate trigger voltage of 1.5 V, and a gate trigger current of 20 mA. It exhibits a forward voltage drop of 1.6 V and a non-repetitive peak on-state current capability of 120 A. The component utilizes a TO-220-2 through-hole package.

Feature Summary

• High-temperature operation capability up to 150°C junction temperature
• Robust surge current handling with 120 A non-repetitive peak on-state current
• Standardized gate triggering requirements for simple circuit integration

Applications

• Industrial motor control systems
• Power supply circuits requiring high thermal stability
• General purpose AC power switching applications

Procurement Notes

Verify the specific suffix 'RTP' against the manufacturer's official datasheet to confirm packaging type and compliance status. Ensure the procurement channel provides valid traceability documentation. Cross-reference the part number with Littelfuse's current production status to avoid obsolete stock issues. Confirm RoHS and REACH compliance details directly from the supplier's certification documents prior to ordering.

Selection Notes

Select this component when a 400 V blocking voltage and 12 A continuous current rating are required in a TO-220-2 package. Consider the 150°C maximum operating temperature for environments exceeding standard industrial limits. Evaluate the 20 mA gate trigger current against available drive circuit capabilities. Compare the 1.6 V forward voltage drop against thermal management constraints in the final assembly design.

Part Context

The SJ4012RTP belongs to Littelfuse's SJ series of thyristors, which are engineered for enhanced thermal performance compared to standard silicon devices. This series targets applications demanding higher reliability under elevated temperature conditions. The TO-220-2 package facilitates efficient heat dissipation through direct mounting to heatsinks, supporting stable operation in power electronics.

Replacement Considerations

Direct substitutes must match the 400 V / 12 A / TO-220-2 specification. Verify pinout compatibility and thermal resistance values. Check if alternative manufacturers offer equivalent high-temperature variants within the same series family.