The Fuji Electric 3MBI50SX-120-02 is a 6-in-1 (three-phase bridge) IGBT module from the SX series, rated for 50A collector current and 1200V collector-emitter voltage. This module integrates six IGBT chips with freewheeling diodes in a single compact package, reducing system complexity and board space in power conversion designs. The SX series is known for its optimized trade-off between conduction loss and switching loss, making it well-suited for variable-speed motor drives, inverters, and other hard-switching converter topologies operating at carrier frequencies up to 15–20 kHz.

The 3MBI50SX-120-02 sees widespread use in industrial AC motor drives, servo amplifiers, UPS systems, solar inverters, and elevator control systems. Its robust 1200V blocking capability provides the necessary headroom for 400V–690V AC bus applications after accounting for line transients and overvoltage events. Maintenance engineers replacing aging drive modules or procurement teams supporting legacy equipment will find this part critical to minimizing downtime. The module's standard footprint and pinout are compatible with a range of Fuji-based drive platforms from the mid-2000s through the early 2010s.

Quick Reference: 3MBI50SX-120-02

Key Features of the 3MBI50SX-120-02:

• 1200V VCES blocking voltage with adequate margin for 400V–690V three-phase AC input systems
• 50A continuous collector current rating with low VCE(sat) for reduced conduction losses at operating current
• Integrated freewheeling diodes with soft recovery characteristics to minimize EMI and switching transients
• Optimized SX-series chip technology balancing switching speed and thermal performance for carrier frequencies up to 15–20 kHz
• Isolated baseplate construction for straightforward heatsink mounting and electrical isolation in the drive chassis
• Short-circuit withstand capability and built-in thermal protection support for robust fault tolerance in drive applications

The 3MBI50SX-120-02 has been discontinued by Fuji Electric, and new factory production carries a lead time of 99 weeks — effectively making spot inventory the only practical source for active repair and maintenance programs. Engineers supporting legacy drive platforms cannot afford multi-year waits when equipment goes down. Procurement teams maintaining MRO and spare-parts inventories for Fuji-based systems should secure buffer stock now while units remain available. Substitutes and form-fit-function replacements are limited, and improper cross-referencing risks drive incompatibility or premature failure.

ATI Accurate Technology is headquartered in Palmetto, Florida and specializes in obsolete, hard-to-find, and long-lead-time power semiconductors including IGBTs, thyristors, diodes, and rectifier modules. Orders placed before 5PM EST ship same day. Contact our team for volume pricing, export documentation, or technical cross-reference support. Call 239-734-7566 or email sales@igbts.us — we're ready to help keep your equipment running.