SJ4012R2TP

Overview

The Littelfuse SJ4012R2TP is a Silicon Controlled Rectifier (SCR) belonging to the SJxx16xx series, designed for high-temperature and robust industrial applications. It features a rated repetitive off-state voltage (VDRM) of 400 V and an on-state RMS current (It RMS) of 12 A. The device exhibits a forward voltage drop (Vf) of 1.6 V, with a gate trigger voltage (Vgt) of 1.5 V and a gate trigger current (Igt) of 10 mA. It operates within a temperature range of -40°C to +150°C and utilizes a TO-220-2 through-hole package. Key electrical characteristics include a maximum holding current (Ih) of 35 mA and a non-repetitive peak on-state current capability of 225 A.

Feature Summary

• High-temperature operation capability up to +150°C for demanding environments
• Glass-passivated junctions ensuring long-term parameter stability and reliability
• Integrated thermal protection mechanisms to prevent catastrophic failure under overload conditions

Applications

• Industrial motor control systems requiring robust phase control
• High-temperature power regulation circuits
• AC power switching applications in harsh operating environments

Procurement Notes

Verify the specific suffix 'R2' against the manufacturer's official datasheet to confirm exact pinout and thermal specifications. Ensure compatibility with existing PCB footprints for the TO-220-2 package. Confirm that the 400V rating meets the circuit's peak voltage requirements. Check for RoHS compliance status if required by project specifications. Validate supplier authenticity to avoid counterfeit components.

Selection Notes

Select this component when a 400V SCR with 12A continuous current handling is required in a TO-220-2 package. Consider the 1.6V forward voltage drop for thermal management calculations. The 150°C maximum junction temperature allows for higher ambient operating conditions compared to standard devices. Ensure the gate drive circuit can supply at least 10mA at 1.5V for reliable triggering.

Part Context

This part belongs to the SJxx16xx series of Thyristors manufactured by Littelfuse. It shares similar structural characteristics with other members like the SJ4016L2TP and SJ4020R2ATP, differing primarily in current ratings and specific thermal or qualification attributes. The series is designed for general-purpose high-power switching applications.

Replacement Considerations

Direct substitutes may include other 400V, 12A SCRs in TO-220 packages from Littelfuse or competitors, provided they match the gate trigger specifications and thermal resistance. Verify that any replacement maintains the same pin configuration and mounting style.