Content last revised on February 5, 2026
7MBR35UA120 Fuji Electric 1200V 35A PIM IGBT Module
For 400V industrial motor drives requiring a compact and integrated footprint, the 7MBR35UA120 1200V 35A PIM provides a robust solution with optimized switching efficiency. This Power Integrated Module (PIM) consolidates a three-phase input rectifier, a brake chopper stage, and a three-phase inverter bridge into a single, low-profile housing. By utilizing the Fuji U-series chip technology, it achieves a significant reduction in conduction and switching losses. Engineers often ask about the "UA" designation, which identifies this module as part of the U-series, specifically optimized for low collector-emitter saturation voltage and high ruggedness. For 400V industrial drives prioritizing high-density integration, this 1200V 35A PIM is the optimal choice.
Key Parameter Overview
Decoding Performance Metrics for Enhanced Power Density
The following technical data provides a framework for evaluating the 7MBR35UA120 within various thermal and electrical constraints. These values are derived from the official manufacturer documentation to support precise engineering calculations.
| Functional Group | Parameter Symbol | Typical Value / Rating |
|---|---|---|
| Inverter Section | VCES (Collector-Emitter Voltage) | 1200V |
| Inverter Section | IC (Continuous Collector Current) | 35A (at Tc=80°C) |
| Inverter Section | VCE(sat) (Saturation Voltage) | 2.10V (typical) |
| Brake Section | IC (Brake Collector Current) | 20A |
| Converter Section | VRRM (Repetitive Peak Reverse Voltage) | 1600V |
| Converter Section | IO (Average Rectified Output Current) | 35A |
| Thermal Sensor | NTC Resistance (at 25°C) | 5kΩ |
Download the 7MBR35UA120 datasheet for detailed specifications and performance curves.
Application Scenarios & Value
Engineering System-Level Reliability in Industrial Motor Drives
The 7MBR35UA120 is primarily utilized in Variable Frequency Drives (VFD) and high-performance servo systems. One of the primary engineering challenges in these applications is managing the startup surge current during motor acceleration. With a repetitive peak current rating of 70A, this module provides a safety margin for handling transient inductive loads without triggering immediate overcurrent protection.
The integration of the 3-phase rectifier and brake chopper directly alongside the inverter bridge simplifies the DC-link busbar design, effectively reducing parasitic inductance. In a typical 15kW pump control system, utilizing this integrated PIM reduces the total PCB area by approximately 30% compared to discrete solutions. For systems requiring lower current handling, the 7MBR25SA120-50 provides a compatible architecture at a reduced power level, while the 7MBR50SB120 offers higher current capabilities for more demanding loads.
By referencing our engineers' ultimate guide, designers can better understand how the low VCE(sat) of 2.10V minimizes heat dissipation, which directly influences the selection of the heat sink and cooling fan assembly.
Technical Deep Dive
The Synergy of the 7-Pack Configuration and U-Series Technology
The 7MBR35UA120 employs a "7-pack" configuration, a terminology derived from its seven internal IGBT switches (six for the inverter and one for the brake). The U-series technology utilized in the silicon chips represents a significant advancement in the trade-off between switching speed and conduction loss.
To visualize the engineering significance of VCE(sat), consider it analogous to the pressure drop in a hydraulic pipe; a lower "pressure drop" across the IGBT means less energy is wasted as heat during the conduction phase. This is vital for maintaining a low junction temperature, particularly when operating at high carrier frequencies. Furthermore, the NTC thermistor integrated near the IGBT chips functions as an internal thermometer, allowing the system controller to perform real-time thermal monitoring.
Proper thermal management is critical, as the thermal resistance from junction to case (Rth(j-c)) for the inverter section is 0.45 K/W. This relatively low resistance ensures that heat is efficiently transferred to the module's baseplate. Following best practices for thermal management, such as applying a uniform layer of thermal grease, is essential to maintain long-term reliability in harsh industrial environments. For further technical context, refer to the product series overview at Fuji Electric.
FAQ
How does the integrated NTC thermistor directly impact the safety of the drive system?
The 5kΩ NTC thermistor allows the gate driver or MCU to monitor the module's internal temperature. By implementing a thermal shutdown threshold based on the NTC resistance change, engineers can prevent catastrophic failure caused by cooling system failure or sustained overload conditions.
What is the primary benefit of the U-series chip technology in this module?
The U-series chip reduces both the collector-emitter saturation voltage and the turn-off energy losses. This results in higher overall inverter efficiency and allows for a smaller heat sink design compared to older generations of 1200V IGBT modules.
Can the 7MBR35UA120 handle 480V AC input lines safely?
Yes. With a 1200V VCES rating for the inverter and a 1600V VRRM rating for the converter bridge, the module is specifically engineered to provide sufficient blocking voltage margin for 400V to 480V AC utility power systems, accounting for standard line voltage fluctuations.
As a specialized distributor, we provide the technical data necessary to support your evaluation of the 7MBR35UA120 for your next industrial power conversion project. Our focus is on providing transparent, fact-based information to empower your design and procurement decisions.
