The Fuji 1MBI400VF-120-50 is a high-current IGBT module rated at 400A and 1200V, built for demanding power conversion applications where switching performance and thermal reliability are non-negotiable. Part of Fuji's V-series IGBT lineup, this module integrates a fast-switching IGBT chip with a freewheeling diode in a compact, isolated base package. It is engineered to deliver low saturation voltage and tight parameter distribution, making it a dependable choice for engineers designing or maintaining industrial-grade power electronics systems operating at high duty cycles.

The 1MBI400VF-120-50 sees widespread use in AC motor drives, regenerative inverters, UPS systems, induction heating equipment, and industrial servo drives. Its 1200V blocking voltage and 400A continuous current rating make it well-suited for medium-voltage bus architectures common in steel mills, paper mills, oil and gas compression, and heavy manufacturing. OEM equipment builders and aftermarket repair facilities alike rely on this module to keep three-phase drive systems operational in environments where downtime translates directly to production loss.

Quick Reference: 1MBI400VF-120-50

Key Features of the 1MBI400VF-120-50:

• 400A continuous collector current with 1200V CE blocking voltage for high-power converter stages
• Low V_CE(sat) characteristic reduces conduction losses across the full operating current range
• Integrated freewheeling diode optimized for soft recovery, minimizing voltage overshoot during commutation
• Isolated copper base plate construction supports direct heatsink mounting and efficient thermal management
• Tight parameter matching between IGBT and diode chips supports paralleling in high-current inverter designs
• Compatible with standard Fuji V-series gate driver circuits, simplifying drop-in replacement in existing drive platforms

The 1MBI400VF-120-50 has been discontinued by Fuji Electric, with new factory production currently requiring a 99-week lead time — effectively inaccessible for emergency repair or unplanned maintenance scenarios. For engineers supporting legacy drive systems or procurement teams managing end-of-life equipment, locating a stocked, verified source is essential. Counterfeit and refurbished parts circulate heavily in the obsolete IGBT market, making supplier credibility a critical factor. ATI Accurate Technology maintains inventory of genuine new OEM modules specifically to support customers who cannot afford to wait on factory lead times.

ATI Accurate Technology is a power semiconductor distributor based in Palmetto, FL, specializing in IGBTs, thyristors, diodes, and rectifier modules — including obsolete and long-lead-time parts like the 1MBI400VF-120-50. Orders placed before 5PM EST ship same-day. Volume pricing is available for MRO stockrooms and OEM builds. Contact our team directly at 239-734-7566 or sales@igbts.us to confirm availability and discuss your requirements.