MSS50-800

Overview

The MSS50-800 is a back-to-back Silicon Controlled Rectifier (SCR) module manufactured by STMicroelectronics, housed in an ISOTOP package. It features a rated repetitive off-state voltage of 800V and a nominal current of 70A. The device exhibits a maximum breakover current of 630A and an on-state voltage of 1.7V at 100A. Gate triggering requires a voltage of 1.3V and a current of 50mA, with a maximum peak reverse gate voltage of 5V. Leakage current is limited to 0.02mA at VDRM. The component supports a dv/dt rating of 500V/μs and a commutation turn-off time of 100μs. Operating junction temperature ranges from -40°C to +125°C.

Feature Summary

• Back-to-back SCR configuration providing high noise immunity for AC switching applications
• Internal ceramic pad ensuring 2500 VRMS insulation compliance with UL standards
• ISOTOP packaging design enabling compact form factor and optimized power bus connections

Applications

• Solid state relays
• Motor control circuits
• Welding equipment
• Heating control systems

Procurement Notes

Verify component authenticity through authorized channels as the MSS50-800 is officially discontinued by the manufacturer. Confirm lot codes and physical markings against original datasheet specifications to ensure compatibility. Check for available surplus stock from verified distributors if immediate procurement is required. Ensure storage conditions meet semiconductor preservation standards to prevent degradation prior to installation.

Selection Notes

Select this module for high-power AC switching tasks requiring robust thermal management and electrical isolation. The ISOTOP package facilitates efficient heat dissipation compared to traditional leaded components. Consider the 800V blocking capability and 70A current rating when designing circuits for industrial loads. Verify that the gate drive circuitry can supply the specified 50mA trigger current reliably under all operating temperatures.

Part Context

This component belongs to the MSS50 series of SCR modules designed for demanding industrial environments. The series utilizes silicon technology to deliver reliable performance in high-voltage applications. The MSS50-800 specifically addresses needs for compact, high-density power control solutions where space constraints and thermal efficiency are critical design parameters.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official replacement guides or contact the manufacturer directly for qualified alternatives compatible with the ISOTOP footprint and electrical ratings.