MCR72-6T

Overview

The MCR72-6T is a reverse blocking thyristor (SCR) from onsemi, rated for 400 V peak repetitive off-state voltage and 8.0 A RMS on-state current. It utilizes a rugged TO-220AB package with center gate geometry to ensure uniform current density and parameter stability across diffused and glass-passivated junctions. The device supports direct driving from integrated circuits due to low trigger currents, with a maximum gate trigger current of 200 µA. Key electrical characteristics include a peak forward on-state voltage of 1.7 V typical at 16 A peak, a holding current of 6.0 mA maximum, and a critical rate-of-rise of off-state voltage of 10 V/µs.

Feature Summary

• Center gate geometry provides uniform current density for enhanced reliability.
• Glass-passivated junctions ensure parameter uniformity and long-term stability.
• Low gate trigger current allows direct interfacing with standard logic ICs.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'T' corresponds to the rail shipping configuration of 50 units per rail as documented in the official datasheet. Confirm that the component meets Pb-Free requirements by checking for the 'G' marking designation on the physical package. Ensure the selected variant matches the required voltage rating of 400 V for the MCR72-6 series.

Selection Notes

Select this component when an 8 A RMS SCR is required for industrial or consumer switching applications. The 400 V blocking capability suits moderate voltage environments. Consider the thermal resistance of 2.2 °C/W junction-to-case for heatsinking calculations. Verify compatibility with logic-level gate drive signals given the low trigger current specification.

Part Context

This part belongs to the MCR72 series of sensitive gate silicon controlled rectifiers designed for high-volume applications. The series includes variants with different voltage ratings (100 V, 400 V, 600 V) sharing the same 8 A RMS current handling and TO-220AB package form factor. The MCR72-6 specifically targets the 400 V segment of this product line.

Replacement Considerations

MCR72-3T and MCR72-8T are confirmed substitutes within the same family, differing only in their peak repetitive off-state voltage ratings of 100 V and 600 V respectively. Ensure the system voltage does not exceed the replacement's rating.