Content last revised on November 11, 2025
Fuji 6MBI8L-120 | The Reliable Power Integrated Module for Compact Drives
The Fuji 6MBI8L-120 is a workhorse Power Integrated Module (PIM) designed for engineers building compact, cost-effective, and reliable low-power motion control systems. By integrating a three-phase converter, a three-phase inverter, and a brake chopper into a single, compact M631 package, this module dramatically simplifies system design, reduces assembly complexity, and enhances overall operational reliability.
At a Glance: Core Advantages
- System-in-a-Package Design: Features a complete 6-in-1 configuration (three-phase rectifier + brake chopper + three-phase inverter) that minimizes board space and component count.
- Robust Electrical Performance: Rated for 1200V (VCES) and 8A (IC), making it ideal for 400V AC line-powered applications under 1.5 kW.
- Proven Reliability: Built on Fuji Electric's established planar IGBT technology, offering a predictable performance envelope and long service life for industrial applications.
- Simplified Thermal Management: The isolated baseplate allows for straightforward mounting to a common heatsink, simplifying the thermal design process compared to managing multiple discrete components.
Key Technical Specifications
The following table provides a summary of the critical electrical and thermal characteristics for the 6MBI8L-120. For comprehensive data, including detailed graphs and Safe Operating Area (SOA) curves, please refer to the official datasheet from Fuji Electric.
| Parameter | Value |
|---|---|
| Collector-Emitter Voltage (VCES) | 1200V |
| Collector Current (IC) @ TC=80°C | 8A (Inverter), 15A (Converter) |
| Collector-Emitter Saturation Voltage (VCE(sat)) | 2.8V (Typ) / 3.4V (Max) |
| Forward Voltage Drop (VF) - FWD | 2.4V (Typ) / 3.0V (Max) |
| Power Dissipation per IGBT (PC) | 45W |
| Operating Junction Temperature (Tj) | +150°C |
| Isolation Voltage (Visol) | 2500V (AC for 1 minute) |
Engineered for High-Value Applications
The true value of the Fuji 6MBI8L-120 lies not in raw switching speed but in its functional integration and reliability. This makes it a strategic choice for specific applications where design efficiency and long-term stability are paramount.
- Low-Power Variable Frequency Drives (VFDs): For motors driving fans, pumps, and conveyors up to ~1.1 kW, this PIM provides a complete power stage solution. The integrated brake chopper is essential for managing regenerative energy during deceleration, a common requirement in drive applications.
- Compact Servo Drives: In automation and robotics, space is often at a premium. The 6MBI8L-120's small footprint allows for the development of compact servo amplifiers for precision positioning systems that do not require high dynamic current.
- Uninterruptible Power Supplies (UPS): The module's integrated converter and inverter stages make it a perfect fit for the power conversion core of smaller online UPS systems, ensuring a clean and stable power output.
Technical Deep Dive: The PIM Advantage
Choosing a PIM (Power Integrated Module) like the 6MBI8L-120 is an explicit design strategy. By co-packaging the rectifier diodes and inverter/brake IGBTs, designers gain significant advantages over a discrete solution. The internal layout is optimized to minimize stray inductance between components, which in turn reduces voltage overshoot during switching events. This inherent robustness can simplify or even eliminate the need for complex snubber circuit design.
Furthermore, consolidating all major power semiconductors onto a single thermally conductive baseplate streamlines heat dissipation. This approach guarantees more uniform temperature distribution and simplifies the mechanical design and assembly of the heatsink, ultimately contributing to the system's long-term reliability and analyzing potential IGBT failure modes becomes a more controlled process.
Frequently Asked Questions (FAQ)
1. When is the 6MBI8L-120 a better choice than using discrete IGBTs and diodes?
This PIM is the superior choice for power applications typically below 1.5 kW where design cycle time, board space, and manufacturing simplicity are critical drivers. For these systems, the cost and complexity of designing, procuring, and assembling a dozen or more discrete components and their associated gate drive circuitry often outweigh the marginal performance gains of a fully discrete solution.
2. What are the recommended gate drive conditions?
Like most industrial IGBTs of this class, the 6MBI8L-120 performs optimally with a gate voltage of +15V for turn-on. A negative gate voltage, typically between -8V and -15V, is strongly recommended for turn-off. This provides a robust noise margin, preventing parasitic turn-on caused by Miller capacitance (dv/dt) effects, a common issue in bridge topologies.
For detailed application notes or to discuss how the Fuji 6MBI8L-120 can fit into your next design, please contact our technical team.
