Fuji Electric 7MBR50SB120-50 IGBT Module

The Fuji Electric 7MBR50SB120-50 (also written 7MBR50SB12050) is a high-power IGBT module featuring a 6-pack configuration (three phase bridge) with integrated freewheeling diodes. It is designed for motor drive inverters, uninterruptible power supplies (UPS), and industrial power converters. The module offers low saturation voltage and fast switching characteristics.

Electrical Ratings

Collector-emitter voltage VCES: 1200V. DC collector current IC: 50A (Tc=100°C), 75A (Tc=25°C). Peak current ICRM: 100A. Total power dissipation: 260W. Built-in NTC thermistor for temperature monitoring. Isolation voltage: 2500V AC (1 minute) between terminals and baseplate.

Switching and Thermal Characteristics

Saturation voltage VCE(sat) typically 1.7V at IC=50A, VGE=15V, maximizing efficiency. Turn-on switching loss Eon: 3.5 mJ; turn-off Eoff: 4.0 mJ; diode reverse recovery Err: 1.8 mJ (typical at 600V, 50A). Junction-to-case thermal resistance Rth(j-c): 0.25°C/W per IGBT, 0.40°C/W per diode. Operating junction temperature Tj: -40°C to +150°C (max 175°C for short-term transient).

Internal Circuit and Construction

The 7-pack includes six IGBTs in a three-phase bridge plus one NTC thermistor. The module uses Fuji’s trench-gate field-stop technology, reducing tail current and improving ruggedness. Copper baseplate for efficient heat dissipation. Terminals are nickel-plated and compatible with standard M5 screw connections.

Mechanical Dimensions

Package type: 120x62mm with M6 screw holes. Height: 17mm (including terminals). Weight 190g. The module is designed for flat mounting on a heatsink with thermal grease or phase change material. Torque for mounting screws: 3.5 Nm; terminal screws: 2.5 Nm.

Protection and Gate Drive

Integrated gate resistors and anti-parallel diodes for soft recovery. The module is not internally short-circuit protected; an external desaturation detection circuit is recommended. Gate-emitter voltage recommended: +15V turn-on, -5V to -15V turn-off. Miller plateau capacitance is minimized.

Applications

Used in variable frequency drives (VFDs) for motors up to 22kW, welding power supplies, solar inverters, and medical power systems. The 1200V rating is ideal for 380-480V AC mains.

Conclusion

The Fuji Electric 7MBR50SB120-50 IGBT module delivers 1200V, 50A capability in a compact 6-pack package. Its low VCE(sat) and field-stop technology ensure high efficiency for three-phase power conversion applications.