The Fuji 1MBI400V-120-50 is a high-current IGBT module delivering 400A continuous collector current at a 1200V collector-emitter voltage rating. Built on Fuji's established V-series IGBT platform, this module integrates a discrete IGBT with a freewheeling diode in a robust isolated baseplate package. It is engineered for low switching losses, stable thermal performance under repetitive load cycling, and reliable gate drive compatibility — characteristics that made it a preferred choice in demanding industrial power conversion equipment throughout its production life.

The 1MBI400V-120-50 is well suited to AC motor drive inverters, regenerative braking systems, UPS inverter stages, induction heating power supplies, and medium-voltage DC link converters. Its 400A current capacity positions it for multi-kilowatt drive systems found in manufacturing automation, crane and hoist drives, compressor controls, and industrial pump applications. OEMs and end users operating legacy equipment built around this module depend on accurate replacement parts to maintain system performance and avoid costly redesigns or platform migrations.

Quick Reference: 1MBI400V-120-50

Key Features of the 1MBI400V-120-50:

• 400A continuous collector current with 1200V VCES breakdown rating
• Integrated inverse parallel freewheeling diode for converter and inverter topologies
• Low VCE(sat) for reduced conduction losses at full load current
• Isolated copper baseplate for direct heatsink mounting and reliable thermal management
• Gate threshold voltage and input capacitance optimized for standard IGBT gate driver ICs
• Designed for hard-switching PWM inverter duty with defined short-circuit withstand ratings

The 1MBI400V-120-50 has been discontinued by Fuji Electric, with any new production requests carrying a 99-week factory lead time — effectively making the open market the only viable source for maintenance spares and repair inventory. Engineers supporting legacy drive systems cannot afford to wait two years for factory fulfillment. Procurement teams managing MRO or capital equipment spares should act early to secure adequate stock. Counterfeit and remarked modules are a documented risk in the obsolete IGBT market; sourcing from a reputable, established distributor with traceable inventory is essential to protect system reliability.

ATI Accurate Technology, based in Palmetto, Florida, stocks the 1MBI400V-120-50 and specializes in hard-to-find, obsolete, and long-lead-time power semiconductors including IGBTs, thyristors, diodes, and rectifier modules. Orders placed before 5PM EST ship same day. Volume pricing is available for MRO stocking orders and OEM requirements. Contact ATI at 239-734-7566 or sales@igbts.us to confirm availability and pricing.