Content last revised on September 10, 2026
Fuji Electric 7MBR15UF120 Compact 1200V 15A PIM IGBT Module
The Fuji Electric 7MBR15UF120 delivers an integrated Power Integrated Module (PIM) architecture combining a three-phase rectifier, dynamic brake chopper, and six-switch inverter into a singular compact footprint for low-power motor control.
Top Specifications: 1200V | 15A | 2500V AC Isolation Voltage
- Consolidates converter, brake, and inverter stages onto one baseplate.
- Minimizes stray inductance across high-frequency commutation loops.
How does a PIM topology streamline three-phase inverter development? By integrating thirteen semiconductor dies into a unified housing, it replaces multi-device layouts, shortening DC-link traces and dampening turn-off voltage overshoot. For space-constrained 400V industrial drives demanding integrated dynamic braking, the 7MBR15UF120 represents an optimal hardware baseline.
Application Scenarios & Value
Optimizing Power Density in Compact Motion Control Hardware
Engineers often face severe spatial limits and complex thermal routing when laying out discrete switches for industrial motor drives. In compact automation cabinets, packing discrete bridge rectifiers, braking MOSFETs, and six discrete IGBT packages onto an inverter board consumes excessive PCB real estate and introduces layout parasitics that can trigger EMI spikes under high-voltage switching.
The 7MBR15UF120 addresses these challenges directly within three-phase Variable Frequency Drive (VFD) designs and robotic servo axes operating on 380V–480V utility grids. During rapid motor deceleration, regenerative energy surges into the intermediate DC bus. The integrated brake chopper switch rated at 1200V and 15A diverts this surplus energy into an external braking resistor, preventing bus overvoltage faults without adding external power transistors.
Integrating the entire power conversion train—from incoming AC rectification to PWM inverter stage—allows power supplies and servo drives to meet stringent IEC 61800-3 EMC benchmarks. For systems operating at higher current demands, the related 7MBR25SA120-50 provides a 25A rating within a similar PIM architecture, while the 7MBR15VKC120-50 offers an alternate pinout arrangement.
Technical & Design Deep Dive
Circuit Integration and Thermal Equilibrium Mechanics
The internal architecture of the 7MBR15UF120 functions much like a pre-engineered electrical substation on a single ceramic substrate. Instead of routing individual high-voltage traces between separate discrete stages, the module embeds the input diode bridge, braking IGBT, free-wheeling diodes, and three-phase inverter bridge on a direct-bonded copper (DBC) substrate. This monolithic arrangement shortens terminal-to-die path lengths, reducing parasitic loop inductance.
What is the primary operational benefit of the integrated NTC thermistor? It enables direct, real-time substrate temperature tracking adjacent to the inverter silicon. Because the thermistor is mounted on the same isolated baseplate, thermal feedback circuits can detect junction heating during prolonged low-speed motor stalls before external sensors register a thermal delta.
Operating an IGBT Module with shared thermal paths requires balanced heat dissipation. The 7MBR15UF120 features an electrical isolation voltage rating of 2500V AC for 1 minute between terminals and the copper baseplate. For designers seeking deeper technical details on module switching characteristics, reviewing voltage-controlled switching dynamics can clarify gate driver impedance matching.
Key Parameter Overview
Functional Grouping and Electrical Ratings
| Functional Stage | Parameter | Symbol | Rating / Value | Test Condition |
|---|---|---|---|---|
| Inverter Stage | Collector-Emitter Voltage | VCES | 1200V | Tj = 25°C |
| Continuous DC Collector Current | IC | 15A | TC = 80°C | |
| Collector-Emitter Saturation Voltage | VCE(sat) | 2.1V - 2.6V (typ/max) | IC = 15A, VGE = 15V | |
| Converter (Input Bridge) | Repetitive Peak Reverse Voltage | VRRM | 1600V | Tj = 25°C |
| Average Output Current (3-Phase) | IO | 15A | 50/60Hz Sine Wave | |
| Brake Stage | Collector-Emitter Voltage | VCES | 1200V | Tj = 25°C |
| Continuous Collector Current | IC | 15A | TC = 80°C | |
| Module Isolation | Isolation Voltage (RMS) | Viso | 2500V AC | Main Terminals to Base, 1 min |
Download the 7MBR15UF120 datasheet for detailed specifications and performance curves.
Frequently Asked Questions
Engineering and Application Guidance
What is the primary function of the brake circuit in the 7MBR15UF120?
The integrated brake switch controls an external resistor across the DC bus, absorbing kinetic energy returned by the motor during active braking and keeping bus voltage within safe operating limits.
How does the 1600V input diode rating support 400V/480V utility connections?
The 1600V VRRM rating provides substantial voltage margin against transient spikes, grid surges, and lightning disturbances common on standard three-phase industrial mains.
Can the 7MBR15UF120 operate with single-ended gate drive supplies?
While a 0V/+15V unipolar drive can switch the gates, applying a -5V to -8V negative turn-off bias prevents spurious dv/dt turn-on caused by Miller capacitance in noisy industrial environments.
How does integrated substrate thermistor placement improve thermal protection?
Direct contact with the DBC substrate minimizes thermal lag compared to external heatsink sensors, enabling fast fault mitigation during sudden overcurrent or cooling fan failures.
What PCB assembly practices are recommended for this pin-mounted power module?
Ensure uniform solder fillet formation across power pins, verify adequate clearance between high-voltage traces, and apply an even thermal grease layer (50–100 µm) before torquing mounting screws.
For inventory inquiries, batch pricing, and technical documentation regarding the 7MBR15UF120, submit your request directly to our technical distribution specialists to accelerate your project evaluation.
