Fuji Electric 7MBI Series IGBT Modules 7MBI40N-120

Technical Dossier

Product Details And Specifications

Fuji Electric 7MBI Series Technical Notes

The Fuji Electric 7MBI series represents one of the most widely deployed families of IGBT (Insulated Gate Bipolar Transistor) power modules in global heavy industry. Installed across chemical processing plants, nuclear power auxiliary systems, petroleum refining facilities, steel mills, and large-scale variable frequency drive (VFD) platforms, the 7MBI series established Fuji Electric's position as a tier-one supplier of discrete power semiconductor modules. These modules are characterized by a 7th-generation IGBT chip architecture, integrated freewheeling diodes, isolated copper base plates, and standardized package footprints compatible with major inverter and converter platforms from ABB, Siemens, Yaskawa, Mitsubishi, and Rockwell Automation.

The 7MBI40N-120 specifically is a 3-phase bridge IGBT module rated at 40A / 1200V, widely used in medium-power industrial inverter drives in the 5.5–15 kW range. Its NX-series chip technology delivers low saturation voltage (VCE(sat)) and fast switching characteristics suitable for PWM inverter topologies operating at carrier frequencies up to 20 kHz.

The Evolution of 7MBI Architecture

Fuji Electric's IGBT module lineage progressed through clearly defined generations, each addressing switching loss, thermal resistance, and short-circuit withstand time. The 7MBI series belongs to the 7th-generation platform, introduced in the mid-2000s as a successor to the 6MBI and 5MBI families. Key architectural milestones include:

• 5MBI / 6MBI era (1990s–early 2000s): Punch-through (PT) IGBT technology, higher VCE(sat), limited switching frequency. Common in legacy Fuji FRENIC and Yaskawa G5 drives.
• 7MBI introduction (~2004–2008): Non-punch-through (NPT) and field-stop (FS) IGBT chips. Reduced switching losses by ~30% vs. 6MBI. Standardized TO-247 and module package footprints. The 7MBI40N-120 and related N-suffix variants use FS-IGBT chips with integrated anti-parallel diodes.
• 7MBR / 7MBP transition (2010s): Fuji introduced the 7MBR and 7MBP sub-families with improved thermal cycling endurance for traction and renewable energy applications. These are not pin-compatible replacements for 7MBI without design review.
• Current status: The 7MBI series is in the mature/end-of-life phase. Fuji Electric has transitioned new designs to the 7MBR and RB-IGBT platforms. However, the installed base of 7MBI-dependent equipment remains extensive, making long-term spare parts availability a critical operational concern for maintenance engineers.

7MBI Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Fuji Electric 7MBI series. All are standard IGBT power modules in isolated package formats (DIP-IPM or discrete module). Current ratings and voltage classes are indicated per model.

1200V Class (N-suffix, FS-IGBT):

• 7MBI10N-120: 10A / 1200V single-phase bridge IGBT module, low-power inverter input stage.
• 7MBI15N-120: 15A / 1200V IGBT module, used in compact 1.5–2.2 kW VFD platforms.
• 7MBI20N-120: 20A / 1200V module, standard in 2.2–4 kW single-axis servo drives.
• 7MBI25N-120: 25A / 1200V IGBT module, mid-range inverter and UPS applications.
• 7MBI30N-120: 30A / 1200V module, 3-phase bridge configuration for 4–7.5 kW drives.
• 7MBI40N-120: 40A / 1200V IGBT module (this listing), 3-phase bridge, 7.5–15 kW inverter range.
• 7MBI50N-120: 50A / 1200V module, medium-power industrial inverter and converter stage.
• 7MBI75N-120: 75A / 1200V IGBT module, used in 15–22 kW drive platforms and active front-end rectifiers.
• 7MBI100N-120: 100A / 1200V module, high-current 3-phase bridge for 22–37 kW inverters.
• 7MBI150N-120: 150A / 1200V IGBT module, heavy-duty industrial drive and crane hoist applications.
• 7MBI200N-120: 200A / 1200V module, large-frame VFD and regenerative converter platforms.

600V Class (L-suffix, standard IGBT):

• 7MBI15L-060: 15A / 600V IGBT module, low-voltage servo and spindle drive applications.
• 7MBI25L-060: 25A / 600V module, 3-phase bridge for 400V-class compact inverters.
• 7MBI50L-060: 50A / 600V IGBT module, mid-power 400V inverter and chopper circuits.
• 7MBI75L-060: 75A / 600V module, used in 400V-class 15–18.5 kW drive platforms.
• 7MBI100L-060: 100A / 600V IGBT module, high-current 400V inverter stage for industrial machinery.

Quality Control for the 7MBI Range

IGBT modules in the 7MBI series present specific test challenges due to their integrated gate driver interface, multi-chip internal topology, and isolated copper base plate construction. DriveKNMS applies the following verification protocol to all 7MBI units prior to dispatch:

• Static parameter verification: VCE(sat) measurement at rated IC and gate voltage (VGE = 15V), compared against Fuji Electric datasheet limits.
• Leakage current test: ICES and IGES measured at rated VCE and VGE = 0V to detect degraded chip junctions.
• Gate threshold voltage (VGE(th)) check: Confirms gate oxide integrity; deviation from 5–6V nominal indicates latent failure.
• Isolation voltage test: 2500V AC applied between base plate and terminals for 1 minute per IEC 60747-9 requirements.
• Thermal resistance inspection: Base plate planarity and surface condition verified to ensure proper thermal interface with heatsink.
• Functional switching test: Where test fixtures are available, dynamic switching waveforms are captured to confirm turn-on/turn-off delay times within specification.