7MBR50U4P120-50 Fuji Electric 1200V 50A 7-in-1 IGBT Module

Content last revised on November 18, 2025

7MBR50U4P120-50: Fuji Electric 1200V / 50A PIM for High-Reliability Motor Drives

The Fuji Electric 7MBR50U4P120-50 is a 7-in-1 Power Integrated Module (PIM) engineered for compact and thermally efficient power conversion systems. Delivering a robust specification of 1200V | 50A | Tj(max) 150°C, this module integrates a three-phase inverter, converter diode bridge, and a brake circuit into a single package. Key benefits include simplified thermal management and enhanced system reliability. It directly addresses the need for integrated power stages in space-constrained applications like small industrial motor drives and servo amplifiers. For systems demanding high efficiency in a compact footprint, the integrated nature of this PIM offers a distinct advantage over discrete solutions.

Key Parameter Overview

Decoding the Specs for Integrated Drive Designs

The electrical characteristics of the 7MBR50U4P120-50 are optimized for motor drive and power conversion applications. The specifications below highlight its capability to balance performance with operational reliability. A key parameter is the collector-emitter saturation voltage (VCE(sat)), which at a typical value of 2.15V for the inverter IGBTs, directly influences conduction losses and, consequently, the thermal design of the end-system. Lower VCE(sat) means less heat is generated during operation, allowing for smaller heatsinks or higher power density.

Download the official datasheet for detailed specifications and performance curves.

 Application Scenarios & Value

System-Level Benefits in AC and DC Servo Drives

The 7MBR50U4P120-50 is engineered for power electronics systems where integration and reliability are paramount. Its primary application is in low-to-medium power motor control, such as Variable Frequency Drives (VFDs), AC and DC servo drive amplifiers, and uninterruptible power supplies (UPS).

A key engineering challenge in these applications is managing the thermal load and physical footprint of the power stage. By integrating seven power devices—a three-phase rectifier, a three-phase inverter, and a brake chopper—into a single compact module, the 7MBR50U4P120-50 fundamentally simplifies the design process. This integration reduces the number of components, minimizes PCB complexity, and, most importantly, provides a single, optimized thermal interface to the heatsink. This consolidation is analogous to using a multi-tool instead of carrying seven separate tools; it saves space, reduces assembly effort, and ensures all components are designed to work together seamlessly. The result is a more compact, cost-effective, and thermally manageable system, which is a critical advantage in competitive industrial automation markets.

For applications requiring slightly lower current handling, the related 7MBR35U4P120-50 offers a similar 1200V rating in a comparable package.

 Frequently Asked Questions (FAQ)

What is the primary benefit of the 7-in-1 PIM configuration in the 7MBR50U4P120-50?

The primary benefit is system simplification. Integrating the converter, inverter, and brake circuits reduces component count, simplifies PCB layout, streamlines assembly, and creates a single, optimized thermal path, leading to higher power density and potentially lower total system cost.

How does the VCE(sat) of 2.15V impact system design?

A lower VCE(sat) value directly correlates to lower conduction losses during operation. This means less waste heat is generated by the IGBT module, which can allow designers to specify a smaller, less costly heatsink or operate at a higher ambient temperature without thermal throttling, improving overall system efficiency and reliability.

What does the 2500V isolation voltage signify for my application?

The Visol rating of 2500V (AC for 1 minute) ensures robust electrical isolation between the power terminals and the mounting baseplate. This is a critical safety feature that prevents high voltage from reaching the chassis or heatsink, protecting both the equipment and personnel, and is essential for meeting industrial safety standards like UL and VDE.

Is this module suitable for high-frequency switching applications?

While optimized for motor drive frequencies (typically up to 20kHz), its suitability for a specific high-frequency application depends on a careful analysis of switching losses (Eon, Eoff, Err). The datasheet provides the necessary characteristic curves to perform this thermal calculation and ensure the junction temperature remains within the safe operating area.

Technical Deep Dive

Analyzing the Integrated Brake Circuit for Dynamic Deceleration

A standout feature of the 7MBR50U4P120-50 is its integrated dynamic brake circuit. This consists of a seventh IGBT and a freewheeling diode connected between the positive and negative DC bus rails. In motor drive applications, particularly those involving high inertia loads like industrial conveyors or elevators, rapid deceleration can cause the motor to act as a generator. This regenerative energy flows back to the DC bus, causing its voltage to rise to potentially damaging levels.

The integrated brake circuit provides an elegant solution. When the DC bus voltage exceeds a predefined threshold, the control system activates the brake IGBT. This switches a large external power resistor across the DC bus, which safely dissipates the regenerative energy as heat. Think of it as an emergency pressure release valve for electrical energy. The integration of this circuit within the module removes the need for an external chopper, saving significant panel space and reducing wiring complexity. This built-in protection mechanism is crucial for ensuring the reliability and Safe Operating Area (SOA) of the entire drive system during dynamic braking events.

Design & Integration Support

Considerations for Implementation

To maximize the performance and longevity of the 7MBR50U4P120-50, several design aspects are critical. Proper gate drive design is essential to ensure clean, fast switching and prevent parasitic turn-on. Thermal management is equally important; using a high-quality thermal interface material (TIM) between the module's baseplate and the heatsink is mandatory to achieve the low thermal resistance needed for effective heat dissipation. Finally, the layout of the DC bus capacitors should be as close as possible to the module's power terminals to minimize stray inductance, which can cause voltage overshoots during switching.