MCR12M

Overview

The MCR12M is a reverse blocking thyristor (SCR) from onsemi, designed for half-wave AC control applications. It features glass passivated junctions and is housed in a rugged TO-220AB package. The device supports peak repetitive off-state voltages of up to 800 V depending on the specific suffix variant. It provides an on-state RMS current rating of 12 A at a case temperature of 80°C and offers high surge current capability of 100 A. Key electrical characteristics include a minimum dv/dt immunity of 100 V/µs at 125°C and specified gate trigger parameters.

Feature Summary

• Glass passivated junctions ensure reliability and parameter uniformity
• High immunity to critical rate of rise of off-state voltage (dv/dt)
• Rugged TO-220AB package construction for low thermal resistance
• Specified minimum and maximum values for gate trigger current and holding current

Applications

• Motor controls
• Heating controls
• Power supplies

Procurement Notes

Verify the specific voltage suffix (D, M, or N) required for your application, as these determine the blocking voltage rating. Confirm that the TO-220AB package style matches your board layout requirements. Ensure thermal management solutions account for the junction-to-case thermal resistance when operating near maximum ratings. Check for Pb-free compliance if environmental regulations apply to your manufacturing process.

Selection Notes

Select the appropriate voltage variant based on the circuit's peak repetitive off-state voltage requirements. Consider the thermal environment, as the 12 A RMS rating is specified at a case temperature of 80°C; derating may be necessary for higher ambient temperatures. Evaluate the gate drive capabilities against the specified trigger current and voltage ranges to ensure reliable turn-on under all operating conditions.

Part Context

This component belongs to the MCR12 series of Silicon Controlled Rectifiers manufactured by onsemi. The series includes variants with different voltage ratings (400 V, 600 V, and 800 V) sharing the same physical package and current handling capabilities. These devices are part of onsemi's portfolio of discrete power semiconductors designed for industrial and consumer AC control applications.

Replacement Considerations

Compatible substitutes within the same family include MCR12DG (400 V), MCR12MG (600 V), and MCR12NG (800 V). When replacing, ensure the substitute part has a blocking voltage rating equal to or greater than the original design requirement. Verify that the pinout and package dimensions remain identical to avoid mechanical integration issues.