The Fuji 1MBI600U4B-120 is a single-switch IGBT module from Fuji Electric's U4B Series, rated for 600A continuous collector current and 1200V collector-emitter voltage. Built for demanding high-power switching environments, this module integrates a fast-recovery freewheeling diode and features low V_CE(sat) characteristics that minimize conduction losses at full load. The robust internal construction and isolated base plate make it well-suited for high-frequency PWM operation in converter and inverter topologies where thermal performance and switching efficiency are critical design constraints.

Industrial applications for the 1MBI600U4B-120 include medium-voltage AC motor drives, regenerative inverters, traction converters, welding power supplies, and large-scale UPS systems. Its 1200V blocking capability and 600A current handling make it a primary choice for three-phase inverter legs in equipment operating from 480V to 690V AC bus systems. OEMs and service engineers working on Fuji-based drive platforms, as well as third-party industrial equipment requiring a direct-fit or cross-reference replacement, will find this module suitable across a broad range of high-current power conversion applications.

Quick Reference: 1MBI600U4B-120

Key Features of the 1MBI600U4B-120:

• 1200V V_CE blocking voltage with 600A rated collector current for high-power inverter and converter stages
• Low V_CE(sat) performance reduces steady-state conduction losses under continuous high-current operation
• Integrated fast-recovery anti-parallel freewheeling diode eliminates the need for external flyback diode components
• Electrically isolated copper base plate supports direct mounting to heatsink assemblies with standard thermal interface materials
• U4B Series gate drive compatibility with standard Fuji IGBT gate resistor and drive voltage requirements (typically ±15V)
• Optimized for PWM switching frequencies typical in industrial motor drive and traction inverter designs

The 1MBI600U4B-120 has been discontinued by Fuji Electric, and new factory production carries a lead time of 99 weeks or greater — effectively making open-market stock the only viable sourcing path for most procurement and MRO timelines. Engineers supporting legacy drive platforms or managing long-term spares programs cannot rely on standard distribution channels for this part. Identifying a supplier with verified, ready inventory is essential to avoiding extended equipment downtime, project delays, or costly drive platform redesigns to accommodate alternative IGBT modules.

ATI Accurate Technology stocks the 1MBI600U4B-120 and ships same-day on orders placed before 5PM EST from our Palmetto, Florida facility. We specialize in obsolete, hard-to-find, and long-lead-time power semiconductors including IGBTs, thyristors, diodes, and rectifier modules. Volume pricing is available for MRO programs and OEM builds. Contact our team directly at 239-734-7566 or sales@igbts.us to confirm availability and receive a quote.