Content last revised on July 2, 2026
Maximizing Power Density and Thermal Reliability with the Fuji Electric 7MBR100VR120-50
The 7MBR100VR120-50 is a highly integrated, low thermal resistance power integrated module designed to optimize heat dissipation and physical space in heavy-duty drive systems. This V-series Trench-FS module delivers 1200V and 100A ratings with a low IGBT junction-to-case thermal resistance of 0.29 °C/W. Slashes thermal overhead. Integrates three-phase power topologies. By housing the converter, brake chopper, and inverter stages inside a compact M720 footprint, it directly addresses the engineering challenge of managing high power density within tight enclosure constraints without compromising isolation.
What is the continuous current rating of the inverter section? It handles up to 100A at a 100°C case temperature.
What is the primary benefit of the V-series Trench-FS chip design? It minimizes conduction losses by optimizing VCE(sat) characteristics.
Application Scenarios & Value
Optimizing Space and Heat in High-Duty-Cycle Motor Drives
For 400V AC motor drives demanding robust thermal margins, this 1200V 100A module stands as a highly compact and optimized power platform. Engineers often face severe layout restrictions when designing heavy-duty industrial drive stages. Traditional discrete designs require excessive routing, which introduces stray inductance and increases mounting complexity. The 7MBR100VR120-50 solves this by consolidating the entire three-phase inverter, brake chopper, and input rectifier bridge into a single copper-baseplate IGBT Module package. This layout is highly advantageous in Variable Frequency Drives (VFDs), Servo Drives, and Uninterruptible Power Supplies (UPS).
Consider a high-inertia industrial centrifuge during sudden deceleration. The motor acts as a generator, pumping energy back into the DC bus and causing voltage spikes. The integrated brake chopper section, rated at 75A continuous and up to 150A peak, safely routes this excess energy to an external dynamic braking resistor. Without this, engineers would have to mount separate power resistors and switching transistors, creating additional thermal hotspots. The 7MBR100VR120-50 handles this thermal transient smoothly due to its copper baseplate design.
For motor drive designs requiring higher current overhead, the related 7MBR150VR120-50 provides a higher 150A continuous inverter rating. Conversely, for lower power requirements with similar thermal performance benefits, the 7MBR50VP120-50 offers an alternative 50A solution.
Technical Deep Dive
Trench-FS Technology and Baseplate Thermal Co-Design
At the core of the 7MBR100VR120-50 is Fuji Electric's 6th Generation V-Series Trench Field-Stop (Trench-FS) IGBT technology. To understand how Trench-FS works, imagine a crowded highway where lanes are narrowed to increase passenger density. In a planar IGBT, current flows through a horizontal channel, which creates bottleneck resistance. The Trench-FS structure digs vertical gates into the silicon. This vertical design effectively opens up more vertical lanes, reducing the thickness of the drift region and allowing carriers to move with minimal obstruction. This is why the terminal collector-emitter saturation voltage (VCE(sat)) is kept at a low 2.25V at Tj=25°C.
This integration minimizes layout complexity, which is a major focus of modern IGBT design and integration. For engineers looking to validate module health during assembly or field maintenance, understanding how to test an IGBT module with a multimeter is an indispensable step.
Managing heat is the central challenge in power module longevity. This PIM module features an internal NTC thermistor for real-time chip temperature monitoring, alongside a highly optimized material stack. The junction-to-case thermal resistance (Rth(j-c)) is only 0.29 °C/W for the main inverter IGBTs, and 0.39 °C/W for the brake IGBT. When mounted on a high-efficiency heatsink with thermal compound, the contact thermal resistance (Rth(c-f)) drops to a mere 0.05 °C/W per device. This ensures that even during high-frequency switching transients, thermal energy is conducted rapidly away from the silicon die to the copper baseplate, keeping the operating junction temperature (Tjop) safely below its 150°C switching limit.
Key Parameter Overview
Decoding the Specs for Enhanced Thermal Reliability
| Module Segment | Key Parameter | Symbol | Highlighted Specification | Unit |
|---|---|---|---|---|
| Inverter (IGBT) | Collector-Emitter Voltage | VCES | 1200 | V |
| Inverter (IGBT) | Continuous Collector Current (Tc=100°C) | IC | 100 | A |
| Inverter (IGBT) | Collector-Emitter Saturation Voltage (Tj=25°C) | VCE(sat) | 2.25 | V |
| Inverter (IGBT) | Thermal Resistance (Junction-to-Case) | Rth(j-c) | 0.29 | °C/W |
| Brake (IGBT) | Collector-Emitter Voltage | VCES | 1200 | V |
| Brake (IGBT) | Continuous Collector Current (Tc=80°C) | IC | 75 | A |
| Brake (IGBT) | Thermal Resistance (Junction-to-Case) | Rth(j-c) | 0.39 | °C/W |
| Converter (Diode) | Repetitive Peak Reverse Voltage | VRRM | 1600 | V |
| Converter (Diode) | Average Output Current (50Hz/60Hz) | IO | 100 | A |
| Converter (Diode) | Surge Current (Non-Repetitive, 10ms) | IFSM | 520 | A |
| Thermistor | Resistance (at T=25°C) | R | 5000 | Ω |
Download the 7MBR100VR120-50 datasheet for detailed specifications and performance curves.
Key Questions & Answers
Technical Insights for Engineers and Integrators
How does the 1600V repetitive peak reverse voltage of the converter stage protect against main line transients in 400V AC industrial networks?
In standard three-phase 400V AC industrial lines, peak grid voltage fluctuations can easily exceed normal operational margins. While the inverter stage operates at 1200V, the input converter diode bridge of the 7MBR100VR120-50 is rated at 1600V. This provides a robust voltage buffer, preventing catastrophic failure from line surges or lightning-induced grid transients without requiring oversized external surge suppressors.
How does the Rth(j-c) of 0.29 °C/W for the inverter IGBTs directly impact heat sink selection and thermal design margins?
A lower thermal resistance of 0.29 °C/W means heat is transferred from the silicon junction to the package case with minimal thermal friction. If an inverter operates at high dissipation, this low thermal resistance limits the internal temperature delta. This allows design engineers to utilize smaller, lighter aluminum extrusion heatsinks or lower fan speeds, directly improving system power density while keeping the junction temperature well within the 150°C operational limit.
Why is the brake chopper rating lower at 75A compared to the inverter's 100A, and how should duty cycle be managed?
Dynamic braking is typically a transient, short-duty-cycle operation. Because deceleration occurs over brief intervals, the 7MBR100VR120-50 optimizes physical space by utilizing a slightly smaller 75A brake IGBT (with a 150A peak rating) compared to the main 100A inverter switches. When designing the gate drive timing, engineers should ensure that the braking resistor's value and the switching sequence keep the continuous thermal dissipation below the brake's 385W rating, preventing localized thermal runaway.
As global industries push for higher energy efficiency standards under carbon-neutral regulations, the engineering focus shifts toward reducing system-level total cost of ownership (TCO) and boosting power conversion efficiency. Adopting highly integrated platforms like the Fuji Electric 7MBR100VR120-50 allows developers to meet strict Eco-design directives without escalating design costs. By maximizing power density while maintaining massive thermal margins, this module represents a pragmatic, long-term building block for the next generation of highly reliable, high-performance industrial motion controllers and green energy conversion systems.
