MCR72-6G

Overview

The Littelfuse MCR72-6G is an 8 Amp sensitive gate silicon controlled rectifier (SCR) housed in a TO-220AB package. It features a peak repetitive off-state voltage of 600 V and supports an on-state RMS current of 8.0 A at 180-degree conduction angles with the case maintained at 83°C. The device exhibits a maximum gate trigger current of 200 µA, enabling direct interfacing with integrated circuits. It withstands a non-repetitive surge current of 100 A for half-cycle sine waves at 60 Hz. The junction-to-case thermal resistance is rated at 2.2 °C/W, supporting operation within a temperature range of -40°C to +110°C.

Feature Summary

• Center gate geometry ensures uniform current density across the semiconductor junction.
• All diffused and glass-passivated junctions provide parameter stability and reliability.
• Thermowatt construction offers low thermal resistance and high heat dissipation capabilities.

Applications

• Temperature control systems
• Light dimming and speed control circuits
• Process and remote controls
• Capacitive discharge circuits

Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm packaging variations. The 'G' suffix indicates lead-free compliance. Confirm mounting torque requirements and thermal interface specifications during integration. Ensure the selected variant matches the required blocking voltage rating for the target circuit design.

Selection Notes

Select the MCR72-6G when a 600 V blocking voltage is required alongside an 8 A continuous current capacity. The sensitive gate characteristic allows for direct drive from logic-level microcontrollers without additional amplification stages. Evaluate thermal management needs based on the specified junction-to-case resistance and ambient operating conditions.

Part Context

This component belongs to the MCR72 series of thyristors manufactured by Littelfuse. The series includes variants with different voltage ratings, specifically the MCR72-3 for 100 V applications and the MCR72-8 for 600 V applications. All models share the same physical package and core electrical characteristics regarding current handling and gate sensitivity.

Replacement Considerations

Direct replacements must match the 600 V rating and 8 A current capacity. Verify that substitute components maintain compatible gate trigger parameters and utilize the TO-220AB footprint for mechanical interchangeability.

FAQ

What is the maximum gate trigger current for this device?

The maximum gate trigger current is 200 µA under continuous DC conditions.

How is the pinout configured for the TO-220AB package?

Pin 1 is the Cathode, Pin 2 is the Anode, Pin 3 is the Gate, and Pin 4 serves as an additional Anode connection.

What is the critical rate-of-rise of off-state voltage?

The critical rate-of-rise of off-state voltage (dv/dt) is typically 10 V/µs at a junction temperature of 110°C.