Fuji 7MBI100U4S-120 IGBT Module

7MBI100U4S-120 IGBT Module: A 1200V, 100A 7-in-1 PIM for High-Efficiency Motor Drives

An Integrated Power Stage for Demanding Drive Applications

Content last revised on October 19, 2025.

The Fuji Electric 7MBI100U4S-120 is a highly integrated 7-in-1 Power Integrated Module (PIM) engineered to maximize efficiency and power density in compact motor drive applications. This module consolidates a complete power stage, featuring key specifications of 1200V | 100A | Vce(sat) 2.2V (typ). The primary engineering benefits include significantly reduced conduction losses and a vastly simplified system assembly process. This component directly addresses the need for a compact, all-in-one power solution for Variable Frequency Drives (VFDs) by integrating the converter, brake, and inverter circuits into a single, thermally efficient package. For designers of AC servo drives up to 22kW prioritizing efficiency and a compact footprint, the 7MBI100U4S-120 provides an optimal integrated solution.

Key Parameter Overview

Decoding the Specs for Efficient Power Conversion

The technical specifications of the 7MBI100U4S-120 are optimized for performance and reliability in its target applications. The parameters are grouped by function to facilitate a clear evaluation for system design.

Download the 7MBI100U4S-120 datasheet for detailed specifications and performance curves.

Application Scenarios & Value

Achieving System-Level Benefits in Compact Motor Drives

The 7MBI100U4S-120 is engineered specifically for power conversion systems where space, efficiency, and simplified manufacturing are critical design drivers. Its integrated nature makes it a cornerstone component in a variety of industrial applications.

• AC Servo Drives: In precision-driven applications like robotics and CNC machinery, rapid acceleration and deceleration cycles are common. The integrated brake chopper in the 7MBI100U4S-120 provides a streamlined solution for managing the regenerative energy from the motor, a process known as Dynamic Braking. This enhances control stability and protects the DC bus from overvoltage conditions. The low Vce(sat) minimizes heat generation, a critical factor in compact, often fanless, servo drive enclosures.
• General Purpose Inverters (VFDs): For applications like pumps, fans, and conveyors, reliability and energy efficiency are paramount. The U4-Series IGBT technology reduces conduction losses, directly contributing to lower operational costs over the system's lifetime. Consolidating the input rectifier, brake, and output inverter into one module reduces the number of electrical connections, mitigating potential points of failure and simplifying assembly.
• Small Industrial Robots & Automation: The compact footprint of the M-240 package enables the design of smaller, more power-dense control cabinets, a key trend in modern factory automation. The module's robust thermal performance ensures reliable operation during repetitive, high-load tasks.

For systems with lower power requirements, the related 7MBR50SB120-50 offers a 50A solution in a similar configuration. For applications demanding higher current handling, the 7MBR150VR120 provides a 150A alternative.

Technical Deep Dive

The Engineering Advantage of Integration and Low-Loss Silicon

Two core design choices in the 7MBI100U4S-120 create distinct engineering advantages: the 7-in-1 topology and the implementation of Fuji Electric's U4-Series IGBT silicon. What is the primary benefit of its 7-in-1 topology? A significant reduction in system complexity and assembly time.

The integration of the three-phase diode rectifier, brake chopper, and three-phase inverter into a single package goes beyond simply saving space. It minimizes the length of high-current DC bus connections between the rectifier and inverter stages. This reduction in path length lowers stray inductance, which can help suppress voltage overshoots during high-speed switching events and potentially simplify the design of snubber circuits, contributing to better electromagnetic compatibility (EMC) performance. The single-module approach streamlines thermal design, as all primary heat-generating components are mounted on a common, isolated baseplate, allowing for a single, optimized heatsink solution. A deep understanding of voltage, current, and thermal management is essential for leveraging these benefits.

At the heart of the module's efficiency is the U4-Series IGBT silicon. The low Collector-Emitter Saturation Voltage (Vce(sat)) of 2.2V at the nominal 100A current rating is a critical performance metric. Think of Vce(sat) as the electrical equivalent of friction. A lower value means less voltage is dropped across the switch when it's fully on, resulting in less energy being converted into waste heat. This relationship is defined by the conduction power loss formula: P_loss = Vce(sat) × Ic. For a designer, this lower heat generation translates directly into a smaller, less expensive heatsink or the ability to operate at higher ambient temperatures without derating, enhancing the system's overall power density and reliability, a crucial aspect in demanding robotic servo drives.

Frequently Asked Questions (FAQ)

How does the integrated 7-in-1 design of the 7MBI100U4S-120 impact the design of a Variable Frequency Drive (VFD)?

The 7-in-1 integration dramatically simplifies the VFD power stage design. It replaces up to seven discrete components or multiple modules with a single unit. This reduces PCB complexity, lowers the component count for procurement and inventory management, and cuts down on assembly time and cost. It also creates a more compact and electrically optimized layout by minimizing the DC link path between the rectifier and inverter.

What is the practical benefit of the 2.2V typical Vce(sat) for a 100A application?

At 100A, a typical Vce(sat) of 2.2V means the IGBT inverter switch will dissipate approximately 220 watts (P = V * I) of power as heat during conduction. A higher Vce(sat), for instance 2.5V, would result in 250W of dissipation. This 30W difference per switch means a cooler running module, which directly improves system reliability and longevity. This efficiency gain allows designers to use smaller heatsinks, reduce fan noise, or achieve higher power output within the same thermal budget.

System Design & Integration

Your Next Step in Power Stage Optimization

The 7MBI100U4S-120 from Fuji Electric offers a compelling combination of integration, efficiency, and proven technology. By leveraging its consolidated 7-in-1 architecture and low-loss U4-Series IGBTs, engineering teams can accelerate development cycles and deliver more compact, reliable, and efficient motor drive solutions. For specific application notes and to evaluate this module for your next design, please review the official technical documentation.