Fuji Electric 7MBR50VM120-50: A 7-in-1 IGBT Module for High-Performance Motor Drives
Content last revised on October 13, 2025.
The Fuji Electric 7MBR50VM120-50 is a highly integrated 1200V, 50A Power Integrated Module (PIM) from the V-Series, engineered to optimize the performance and power density of motor drives and power conversion systems. This module consolidates a three-phase converter, a three-phase inverter, and a brake circuit into a single compact package. With key specifications of 1200V (Inverter) | 50A (Inverter) | VCE(sat) of 2.20V (Typ), it provides a robust foundation for efficient power switching. The primary benefits include simplified system assembly and enhanced thermal management due to its integrated nature. This module directly addresses the engineering challenge of designing compact, reliable AC and DC servo drive amplifiers by providing a pre-configured 7-in-1 solution that reduces component count and simplifies PCB layout. For industrial motor drives requiring high efficiency in a compact footprint, the 7MBR50VM120-50 offers a compelling, integrated power stage solution.
Key Parameter Overview
Decoding the Specs for Integrated Power System Design
The technical specifications of the 7MBR50VM120-50 are tailored for designers of variable frequency drives, servo amplifiers, and uninterruptible power supplies. The parameters below highlight the module's capacity for balanced performance in switching speed, conduction losses, and thermal efficiency.
| Parameter | Specification | Engineering Value |
|---|---|---|
| Inverter Collector-Emitter Voltage (VCES) | 1200V | Provides a substantial safety margin for applications on 400V to 575V AC lines, ensuring reliability against voltage transients common in industrial environments. |
| Inverter Continuous Collector Current (Ic at Tc=80°C) | 50A | Supports sufficient current handling for small to mid-sized motor drives and power converters, enabling robust performance under continuous load. |
| Inverter Collector-Emitter Saturation Voltage (VCE(sat) at Ic=50A) | 2.20V (Typ.) / 2.70V (Max.) | A lower VCE(sat) signifies reduced conduction losses, which directly translates to higher operational efficiency and lower heat generation. This is akin to having less friction in a mechanical system, wasting less energy as heat. |
| Converter Repetitive Peak Reverse Voltage (VRRM) | 1600V | Offers high blocking voltage capability for the input rectifier stage, enhancing the system's resilience to line voltage fluctuations and surges. |
| Junction Temperature (Tj) | 175°C (Max, Inverter/Brake) | The high maximum junction temperature provides a significant thermal headroom, allowing for more compact heatsink designs or reliable operation in higher ambient temperatures. |
| Isolation Voltage (Viso) | 2500 VAC (1 min) | Ensures robust electrical isolation between the power circuit and the mounting baseplate, a critical safety requirement for UL and IEC compliance in industrial equipment. |
Download the 7MBR50VM120-50 datasheet for detailed specifications and performance curves.
Application Scenarios & Value
Achieving System-Level Benefits in Compact Motion Control
The 7MBR50VM120-50 is specifically designed for power conversion applications where space, assembly simplicity, and reliability are critical decision factors. Its 7-in-1 PIM (Power Integrated Module) architecture provides significant value in systems like AC servo drives, small-to-medium Variable Frequency Drives (VFDs), and uninterruptible power supplies (UPS).
A primary engineering challenge in servo amplifier design is managing the thermal load and physical footprint of the power stage. The 7MBR50VM120-50 directly confronts this by co-packaging all major power components onto a single thermally conductive baseplate. This integration simplifies the thermal design to a single heatsink interface, unlike a discrete solution which requires managing multiple thermal paths. The result is a more compact, reliable, and easier-to-assemble system. The inclusion of a brake chopper IGBT is particularly beneficial for Servo Drive applications, where managing regenerative energy during motor deceleration is essential for system stability and safety.
While the 7MBR50VM120-50 is optimized for 50A applications, for systems requiring higher current handling in a similar integrated package, the related 7MBR75VB120-50 provides a 75A alternative.
Frequently Asked Questions (FAQ)
What is the primary benefit of the 7-in-1 PIM configuration in the 7MBR50VM120-50?
The integrated design significantly reduces system complexity, component count, and assembly time. It consolidates the input rectifier, output inverter, and brake circuit, simplifying PCB layout, procurement, and thermal management into a single-module solution.
How does the 175°C maximum junction temperature influence system design?
The high Tj rating provides greater thermal margin, which can be leveraged in two ways: it allows the module to operate reliably in higher ambient temperatures without derating, or it enables the use of a smaller, more cost-effective heatsink, contributing to higher overall power density.
Is the included NTC thermistor calibrated?
The datasheet provides the resistance-temperature characteristic (R-T curve) for the built-in NTC thermistor. This allows designers to accurately monitor the module's case temperature, which is essential for implementing over-temperature protection and ensuring long-term operational reliability.
What does the VCE(sat) of 2.20V (typ.) mean for my application?
This value represents the on-state voltage drop across the IGBT at its rated current. A lower VCE(sat) indicates lower power loss during conduction (P_loss = VCE(sat) * Ic). For a motor drive, this translates directly to improved energy efficiency, reduced cooling requirements, and lower operating costs over the product's lifetime.
Can this module be used for applications other than motor drives?
Yes, while optimized for motor control, its architecture is well-suited for any three-phase power conversion application, such as uninterruptible power supplies (UPS) and small-scale solar inverters, that can benefit from its integrated rectifier, inverter, and brake functions.
An Engineer's Perspective
From an engineering standpoint, the 7MBR50VM120-50 is a practical problem-solver for power stages in the sub-15kW range. Its value is not just in its individual specifications but in its holistic approach to system integration. By consolidating seven power devices, it effectively abstracts away much of the complexity associated with layout, thermal balancing, and parasitic inductance that designers face with discrete components. The choice of a Fuji Electric V-Series IGBT indicates a focus on achieving a balanced trade-off between conduction and switching losses, making it a versatile workhorse for applications with switching frequencies typically found in modern motor control algorithms. This module is an excellent fit for engineering teams looking to accelerate their design cycle and enhance the manufacturability and reliability of their final product.
