FUJI 6MBI50S-140 IGBT Module

Fuji Electric 6MBI50S-140: 1400V 6-Pack IGBT Module for High-Reliability Power Conversion

A Foundation for Thermally Efficient and Robust Industrial Systems

Content last revised on October 11, 2025.

Engineered for exceptional thermal performance, the Fuji Electric 6MBI50S-140 IGBT module provides a robust foundation for high-efficiency power conversion systems. With core specifications of 1400V | 50A | VCE(sat) 2.7V (typ), this device delivers tangible engineering benefits including enhanced thermal reliability and superior operational efficiency. It directly addresses the engineering challenge of managing heat in compact power stages, ensuring stable performance under demanding industrial loads. For designers of mid-power motor drives seeking a balance of performance and thermal margin, the 6MBI50S-140 offers a compelling, field-proven solution.

Key Parameter Overview

Decoding the Specs for Thermal Stability and Efficiency

The technical specifications of the 6MBI50S-140 are tailored for demanding industrial applications where reliability and efficiency are paramount. The parameters are grouped by function to facilitate engineering evaluation for specific design phases, from initial power stage dimensioning to final thermal validation.

Download the 6MBI50S-140 datasheet for detailed specifications and performance curves.

Application Scenarios & Value

System-Level Benefits in Motor Drives and Power Supplies

The 6MBI50S-140 is an optimal power component for three-phase inverters in the 7.5 kW to 15 kW power range, depending on the specific switching frequency and cooling efficiency. Its primary value is demonstrated in applications where thermal management is a critical design constraint.

High-Fidelity Engineering Scenario: Consider the design of a compact Variable Frequency Drive (VFD) for a 10 kW industrial motor. The engineer's challenge is to minimize the enclosure size, which directly limits the heatsink volume. The 6MBI50S-140 addresses this directly. Its low typical VCE(sat) of 2.7V minimizes conduction losses, which are the primary source of heat during operation. This lower heat generation, combined with an effective thermal resistance (Rth(j-c)), simplifies heatsink design and can enable a smaller thermal solution without compromising long-term reliability. This directly translates to a higher power density and potentially lower system cost.

• Industrial Motor Drives: Provides precise and efficient control for AC induction motors in conveyors, pumps, and fans.
• Uninterruptible Power Supplies (UPS): Forms the core of the inverter stage, ensuring reliable power backup with high efficiency.
• Welding Power Supplies: Delivers the robust switching performance necessary for high-current welding applications.

While the 50A rating of this module is suitable for a wide range of applications, systems requiring higher current handling for larger motors may consider the related 6MBI100S-120-02, which offers a 100A capability in a compatible package family.

Technical Deep Dive

A Closer Look at Conduction Loss and Thermal Pathway Optimization

A key aspect of effective power module selection is understanding the interplay between electrical losses and thermal dissipation. For the 6MBI50S-140, the collector-emitter saturation voltage, VCE(sat), is a pivotal parameter. What is the primary benefit of its low VCE(sat)? It directly reduces the power lost as heat during the switch's 'on' state (P_loss = VCE(sat) * Ic).

However, generating less heat is only half the battle. The heat must be efficiently extracted from the IGBT chip. This is where Thermal Resistance , Rth(j-c), becomes critical. Think of thermal resistance as the width of a pipe. A smaller Rth(j-c) value is like a wider pipe, allowing more heat (water) to flow away from the junction (source) to the case and heatsink (drain) for the same temperature difference. The 6MBI50S-140's design focuses on optimizing this thermal pathway, ensuring the heat generated by conduction and switching losses is removed effectively, keeping the junction temperature within safe operating limits and maximizing the module's operational lifespan.

Frequently Asked Questions

How does the VCE(sat) of the 6MBI50S-140 contribute to higher system efficiency?

A lower VCE(sat) directly reduces conduction power loss (Power = Voltage x Current) when the IGBT is on. This means less energy is wasted as heat and more is delivered to the load. In a VFD, this translates to higher wall-to-motor efficiency and lower operating costs over the system's lifetime.

What is the significance of the module's 1400V Vces rating in practical design?

The 1400V collector-emitter voltage rating provides a substantial safety margin for applications operating on 400V or 480V AC lines. It ensures the device can safely withstand voltage spikes caused by switching transients and line fluctuations, a crucial factor for building robust and reliable industrial equipment like servo drives and UPS systems.

Is an isolated gate driver required for the 6MBI50S-140?

Yes, an isolated gate driver is essential. The module contains six independent IGBTs for a three-phase bridge, where the high-side IGBT emitters float at high voltage potentials. An isolated gate driver provides the necessary electrical isolation between the low-voltage control logic (microcontroller) and the high-voltage power stage, ensuring safe operation and preventing catastrophic failures.

System Integration and Design Support

To maximize the performance and reliability of the 6MBI50S-140, engineers are encouraged to contact us for support on their design challenges. We can provide guidance on topics such as gate driver selection, heatsink dimensioning, and snubber circuit design to ensure your power conversion system operates at its full potential.