The Fuji Electric 7MBR50U4B-120B-01 is a U4B-Series IGBT power module rated at 50A continuous collector current and 1200V blocking voltage. Built on Fuji's established U-Series platform, this module integrates fast-switching IGBT chips with freewheeling diodes in a compact, isolated baseplate package optimized for low switching losses and reliable thermal performance. It is a direct fit for three-phase inverter bridge topologies and is engineered to deliver stable operation across demanding duty cycles in harsh industrial environments.

The 7MBR50U4B-120B-01 sees widespread deployment in AC motor drives, servo amplifiers, UPS systems, induction heating equipment, and solar inverters where a robust 1200V-class IGBT module is required. Its combination of low V_CE(sat), integrated gate-drive compatibility, and established reliability record makes it a preferred choice for OEM designs still running legacy drive platforms, as well as for MRO replacements in the field. The isolated copper baseplate simplifies mounting to standard heatsink assemblies, reducing integration time during maintenance overhauls.

Quick Reference: 7MBR50U4B-120B-01

Key Features of the 7MBR50U4B-120B-01:

• 1200V collector-emitter breakdown voltage (V_CES) suitable for 690V AC drive topologies with full derating margin
• 50A continuous collector current with integrated anti-parallel freewheeling diodes for complete inverter leg functionality
• Low V_CE(sat) characteristic reduces conduction losses and thermal stress at rated load
• Isolated insulated baseplate construction enables direct heatsink mounting without additional isolation hardware
• Fuji U4B-Series IGBT technology optimized for switching frequencies up to 20kHz in motor drive applications
• Compatible with standard gate drive circuits requiring +15V / -15V bipolar supply for reliable turn-on and turn-off control

The 7MBR50U4B-120B-01 has been discontinued by Fuji Electric, and new factory production carries a 99-week lead time — effectively placing it out of reach for urgent repair or line-down situations. Many industrial systems incorporating this module remain in active service, and sourcing replacement stock through the open market is the only practical path for maintenance teams facing a failed drive or a scheduled overhaul. Procurement professionals managing aging equipment should consider securing buffer stock now to avoid costly unplanned downtime, particularly given the extended factory lead time and the continued erosion of available inventory across the supply chain.

ATI Accurate Technology stocks the 7MBR50U4B-120B-01 and ships same-day on orders placed before 5PM EST from our facility in Palmetto, Florida. We specialize in obsolete, hard-to-find, and long-lead-time power semiconductors. Volume pricing is available for stocking orders. Contact our team directly at 239-734-7566 or sales@igbts.us for availability confirmation, quantity pricing, and lead time details.