The Fuji 6MBI100U4B-120-52 is a 6-in-1 IGBT module from Fuji Electric's U4B series, rated for 100A continuous collector current and 1200V blocking voltage. This module integrates six IGBT chips with co-packed freewheeling diodes in a single housing, making it a self-contained three-phase inverter bridge solution. The U4B platform is engineered for low V_CE(sat) and reduced switching losses, supporting high carrier-frequency operation while maintaining thermal stability across demanding duty cycles in industrial environments.

The 6MBI100U4B-120-52 is widely deployed in AC motor drives, servo amplifiers, UPS systems, solar inverters, and industrial welding equipment. Its 1200V rating provides the necessary voltage headroom for 400V–690V AC bus applications, while the 100A current rating suits mid-range drive platforms found on CNC machinery, conveyor systems, HVAC compressor drives, and regenerative braking systems. Maintenance engineers replacing failed inverter bridges in legacy equipment frequently specify this module as a direct drop-in solution.

Quick Reference: 6MBI100U4B-120-52

Key Features of the 6MBI100U4B-120-52:

• 1200V collector-emitter voltage (V_CES) with 100A rated collector current — suitable for 400V–690V AC three-phase drive topologies
• 6-in-1 integrated three-phase inverter bridge with co-packed freewheeling diodes, reducing system component count and PCB footprint
< li>U4B generation IGBT technology delivers reduced V_CE(sat) and optimized switching characteristics for high-frequency PWM operation
• Low thermal resistance junction-to-case (R_th(j-c)) supports high power density designs with forced-air or liquid-cooled heatsink mounting
• Industry-standard module footprint and pinout for straightforward replacement in existing drive platforms without mechanical redesign
• Isolated copper baseplate construction ensures electrical isolation between the power circuit and heatsink, meeting reinforced insulation requirements in industrial equipment

With a current factory lead time of 99 weeks on new production, the 6MBI100U4B-120-52 represents exactly the kind of long-lead-time, hard-to-source component that can halt production lines and delay capital equipment repairs for nearly two years if not proactively managed. Procurement teams supporting critical manufacturing infrastructure cannot afford to rely solely on factory order queues for a part of this nature. ATI maintains inventory of Fuji IGBT modules specifically to bridge this gap — providing immediate access to new OEM components when factory channels leave engineers waiting.

ATI Accurate Technology is a power semiconductor distributor based in Palmetto, Florida, stocking IGBTs, thyristors, diodes, and rectifier modules — including obsolete and long-lead-time parts like the 6MBI100U4B-120-52. Orders placed before 5PM EST ship same-day. Volume pricing is available for MRO and OEM procurement programs. Contact our team directly at 239-734-7566 or sales@igbts.us to confirm availability and request a quote.