6MBI300U4-120 - 1200V 300A 6-in-1 IGBT Module | Fuji Electric
MPN: 6MBI300U4-120 ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
6MBI300U4-120 Overview
An IGBT (Insulated Gate Bipolar Transistor) module combines multiple IGBT dies and freewheeling diodes on an isolated substrate within a single molded housing, sitting at the top of the power semiconductor hierarchy: discrete IGBT -> IGBT chip set -> power module -> power conversion system. Modules simplify thermal design, reduce stray inductance, and provide certified isolation between the silicon and the heatsink surface.
Key features of the 6MBI300U4-120 include a collector-emitter voltage rating of 1.2 kV, a maximum collector current of 450 A (absolute maximum), high-speed voltage-drive switching, and a low-inductance module structure that minimizes voltage overshoot during turn-off. The integrated thermistor enables real-time heatsink temperature monitoring for protection and derating logic, and the maximum operating junction temperature is 150 C.
The U-series construction uses Fuji Electric's optimized IGBT and FWD chips for a favorable trade-off between conduction losses (low VCE(sat)) and switching losses, making the module well suited to hard-switched PWM inverters driven by standard gate drivers. The low-inductance layout supports fast di/dt events without excessive transient voltages when paired with proper DC-link snubbering.
Typical applications include three-phase AC motor drives (VFDs), servo amplifiers, industrial UPS systems, welding power supplies, and renewable-energy power conversion stages operating from 1200 V-class DC buses. The 300 A continuous rating with 450 A peak capability covers mid- to high-power inverter stages in the tens of kilowatts range.
Design consideration: always operate within absolute maximum ratings for voltage, current, and temperature, and connect an adequate fuse or circuit protector as required by the datasheet safety guidance; verify square operating area limits against your worst-case load and fault conditions.
This page synthesizes distributor availability, drop-in variant alternatives, comparison data, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for 6MBI300U4-120 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
6MBI300U4-120-01
✅ Drop-In📋 Reference alternative (not in catalog)
6MBI300U4-120-50
✅ Drop-In📋 Reference alternative (not in catalog)
6MBI300U-120
✅ Drop-In📋 Reference alternative (not in catalog)
6MBI450U4-120
✅ Drop-In📋 Reference alternative (not in catalog)
6MBI600U4-120
✅ Drop-In📋 Reference alternative (not in catalog)
6MBI300U4-120 Maximum Ratings & Electrical Characteristics
| Manufacturer | Fuji Electric |
| Product Type | IGBT Module (6-in-1, three-phase bridge) |
| Collector-Emitter Voltage (VCES) | 1.2 kV |
| Collector Current Rating (DC) | 300 A |
| Maximum Collector Current (peak) | 450 A |
| Series | U-Series |
| Configuration | 6-in-one package (inverter bridge) |
| Terminal Count | 29 |
| Maximum Operating Temperature | 150 C |
| Built-in Thermistor | Yes (heatsink temperature sensing) |
| Switching Type | High speed switching, voltage drive |
| Module Structure | Low inductance module structure |
| Mounting Type | Chassis-mount / screw-terminal power module |
| Datasheet Length | 14 pages |
6MBI300U4-120 standard Pin Configuration Guide
Pin configuration for 6MBI300U4-120 (standard package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for 6MBI300U4-120.
Refer to the datasheet for full pin configuration.
Typical Applications
6MBI300U4-120 is suitable for 6 applications: Three-Phase Motor Drives (VFD), Industrial UPS / Inverter Power Stages, Welding Power Supplies, Renewable Energy Power Conversion, Servo Amplifiers and Motion Control, Test and Power Supply Equipment.
Three-Phase Motor Drives (VFD)
The 6MBI300U4-120 fits three-phase variable frequency drives because its 6-in-one package integrates the complete inverter bridge: six 1200 V IGBTs with freewheeling diodes rated 300 A continuous and 450 A peak. In a VFD, the module sits between the DC link capacitor bank and the motor output terminals, switched by PWM gate drivers at carrier frequencies typically from a few kHz upward. Its low-inductance structure limits turn-off voltage overshoot at fast di/dt, protecting against VCE spikes above the 1200 V rating on stiff DC buses. The built-in thermistor feeds heatsink temperature to the drive controller for derating and over-temperature trip, a key protection in motor drives with widely varying load profiles. Power dissipation combines conduction losses (VCE(sat) times phase current) and switching losses scaling with carrier frequency, so designers balance switching speed against thermal budget per the Fuji Electric datasheet.
Recommended
Industrial UPS / Inverter Power Stages
Uninterruptible power supply inverter stages benefit from the 6MBI300U4-120's 1200 V blocking voltage and 300 A rating, which cover battery bus architectures and high-power online UPS frames in the tens of kVA range. The module's integrated three-phase bridge reduces assembly complexity compared with discrete IGBT solutions, lowering stray inductance and improving fault survivability during battery transfer events. The built-in thermistor gives the UPS controller continuous heatsink feedback so overload and short-time ratings can be managed safely. In UPS use, switching is usually at moderate carrier frequencies to limit switching losses during extended inverter operation, and the voltage-drive gate interface works with standard isolated drivers. Fuji Electric's datasheet requires operation strictly within absolute maximum ratings and connection of an adequate fuse or protector, which in UPS practice maps to fast semiconductor fuses on the DC link protecting the 450 A absolute maximum device limit.
Recommended
Welding Power Supplies
High-power welding inverters demand robust, low-inductance switching modules; the 6MBI300U4-120's 1200 V / 300 A class and low-inductance package structure directly address this. In arc-welding inverters, the module switches DC-link energy into a transformer at high frequency, and the 450 A absolute maximum capability provides headroom for the short-circuit-prone nature of arc loads. The integrated thermistor monitors heatsink temperature during high duty-cycle welding, where average losses remain high for extended periods. Because welding supplies operate from rectified three-phase industrial mains, the 1200 V rating gives appropriate margin on the rectified bus. Voltage-drive gating simplifies the driver electronics needed for fast short-circuit shutdown, a critical requirement when the arc creates near-short conditions. Designers must apply the datasheet's fuse/protector guidance so that fault energy is cleared before die-level destruction thresholds are exceeded.
Recommended
Renewable Energy Power Conversion
Central inverters and energy-storage converters operating from 1200 V-class DC strings can deploy the 6MBI300U4-120 as the main three-phase bridge. Its 300 A continuous rating supports mid-power inverter stages, while the low-inductance construction is important in solar and storage applications where long DC busbars between the string combiner, capacitors, and module otherwise create large overshoot during turn-off. The built-in thermistor supports the field reliability requirements of outdoor converters, enabling thermal derating strategies tied to ambient and cooling conditions. High-speed voltage-drive switching allows reasonable efficiency at the moderate switching frequencies typical of grid-tied inverters, and the 150 C maximum operating temperature provides design margin for harsh environments. As with all Fuji Electric power modules, the datasheet mandates operation within absolute maximum ratings and the use of adequate fusing on the DC side to protect the device during panel or battery fault events.
Recommended
Servo Amplifiers and Motion Control
Servo amplifiers driving high-torque AC motors use compact inverter stages where the 6MBI300U4-120's integrated 6-unit bridge simplifies power layout and maximizes power density. Machine-tool and robotics servo drives benefit from the module's low-inductance structure, which keeps turn-off transients controlled during rapid torque reversals and regenerative braking events that impose high current pulses on the bridge. The 300 A / 450 A rating envelope accommodates the peak overload currents typical of servo duty cycles, and the built-in thermistor allows the motion controller to implement accurate thermal models of the drive for maximum continuous torque extraction without overheating. Voltage-drive gating permits compact, high-channel-count driver boards suitable for amplifier form factors. Thermal design should follow the Fuji Electric datasheet mounting guidance to minimize case-to-heatsink resistance, since servo peak-to-continuous ratios concentrate losses in short high-current bursts repeated at high rate.
Recommended
Test and Power Supply Equipment
Programmable AC power sources, regenerative grid emulators, and high-power DC electronic loads frequently employ three-phase IGBT bridges such as the 6MBI300U4-120 as their output or energy-recovery stage. The module's 1200 V rating supports emulation of 400 V-class three-phase grids with adequate margin, and its 300 A rating with 450 A peak covers transient overload profiles that test equipment must source or sink. The integrated thermistor gives instrument controllers a direct thermal health signal for predictive protection during long automated test sequences. The low-inductance package supports the fast switching edges required for high-bandwidth waveform synthesis at the output, while voltage-drive gating simplifies multi-channel driver designs used in four-leg and three-level converter topologies derived from the standard bridge. Adhering to the datasheet's absolute maximum rating and fusing requirements is essential because test equipment deliberately stresses outputs across wide operating envelopes.
Recommended
Recommended Products Summary
Engineering reference data for 6MBI300U4-120 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 6MBI300U4-120-01 | 6MBI300U4-120-50 | 6MBI300U-120 | 6MBI450U4-120 | 6MBI600U4-120 |
|---|---|---|---|---|---|---|
| Package | 6-in-one IGBT module (U4) | 6-in-one U4 - same | 6-in-one U4 - same | 6-in-one U - same family | 6-in-one U4 - same family | 6-in-one U4 - same family |
| Brand | Fuji Electric | Fuji Electric | Fuji Electric | Fuji Electric | Fuji Electric | Fuji Electric |
| Collector-Emitter Voltage | 1.2 kV | 1.2 kV | 1.2 kV | 1.2 kV | 1.2 kV | 1.2 kV |
| Collector Current Rating | 300 A (450 A abs max) | 300 A | 300 A | 300 A | 450 A class | 600 A class |
| Configuration | 6-in-one (three-phase bridge) | 6-in-one | 6-in-one | 6-in-one | 6-in-one | 6-in-one |
Key Differentiators
- Integrated thermistor temperature sensing (vs 6MBI300U-120)
- Low-inductance module structure (vs 6MBI300U-120)
- 450 A absolute maximum headroom over 300 A rating (vs 6MBI450U4-120)
Design Notes
Operate the 6MBI300U4-120 strictly within its absolute maximum ratings (1.2 kV, 450 A peak, 150 C maximum operating temperature) as emphasized in the Fuji Electric datasheet safety warnings. Connect an adequate semiconductor fuse or circuit protector on the DC link so that shoot-through or load faults are cleared before module destruction thresholds are reached. Size the fuse I2t below the module's withstand capability and coordinate with the 300 A continuous rating of the bridge.
Use the built-in thermistor to implement multi-level thermal protection: warn, derate, and trip thresholds tied to heatsink temperature rather than relying solely on calculated losses. Estimated: junction temperature rise equals total losses (conduction plus switching) multiplied by the case-to-heatsink and heatsink-to-ambient thermal resistances from the datasheet curves; verify your specific VCE(sat) and switching energy values against the official datasheet tables since these are operating-point dependent. Keep maximum junction temperature well below the 150 C limit for lifetime reliability.
Exploit the low-inductance module structure by keeping the DC-link capacitor loop as short and wide as possible: mount laminated busbars directly onto the module DC terminals and place snubber/decoupling capacitors adjacent to the P and N terminals. Gate-drive loops to each IGBT should be twisted-pair or closely coupled to minimize loop inductance. This reduces turn-off VCE overshoot during fast di/dt events and prevents exceeding the 1200 V rating during switching transients.
Do not confuse the U-series and U4-series variants when sourcing: the 6MBI300U-120 lacks the thermistor integration present in the 6MBI300U4-120, so a substitution without redesigning the temperature-sense circuit leaves the system without thermal feedback. Verify terminal assignments against the outline drawing (page 3 of the datasheet shows the outline drawing and equivalent circuit) before fabricating busbars or gate harnesses, since power module pinouts are not standardized across series.
Compliance Information
Compliance information was not stated in the retrieved web data or datasheet snippets. Request RoHS/REACH certificates from Fuji Electric or the distributor.
