The Fuji 1MBI400NN-120 is a single-switch IGBT module delivering a 400A continuous collector current rating and 1200V collector-emitter voltage, making it a robust solution for high-power switching in industrial-grade power electronics. Built to Fuji's NN-series architecture, it offers low saturation voltage and optimized switching characteristics that reduce thermal stress and switching losses in high-frequency inverter topologies. The module's rugged construction supports demanding duty cycles encountered in heavy industrial environments, and its footprint is compatible with a range of standard heatsink and drive configurations already established in the field.

The 1MBI400NN-120 sees broad deployment in industrial AC motor drives, servo amplifiers, UPS systems, induction heating equipment, and medium-voltage inverter stages used in steel, pulp and paper, oil and gas, and municipal water infrastructure. System integrators and OEM repair teams rely on this module in variable-frequency drives where replacing the full drive assembly is cost-prohibitive. Its 1200V blocking capability provides the necessary headroom for 690V AC bus applications, and the 400A rating supports multi-kilowatt output stages without requiring parallel device configurations in most legacy designs.

Quick Reference: 1MBI400NN-120

Key Features of the 1MBI400NN-120:

• 400A continuous collector current with 1200V C-E voltage rating suited for 690V AC bus topologies
• Low V_CE(sat) characteristics minimize conduction losses across the full operating current range
• Integrated gate-emitter structure optimized for compatibility with standard IGBT gate drive circuits (typically ±15V)
• Isolated baseplate construction supports direct mounting to standard heatsink assemblies for simplified thermal management
• Designed for switching frequencies applicable to industrial PWM inverter and chopper circuits
• Built-in freewheeling diode optimized for co-switching performance, reducing reverse recovery losses in hard-switching topologies

The 1MBI400NN-120 has been discontinued by Fuji Electric, with any new factory production requiring lead times of 99 weeks or longer — effectively ruling out the OEM channel for maintenance and repair timelines. For operators managing aging drive systems, unplanned downtime while waiting on factory orders is not an acceptable outcome. Sourcing from a distributor with physical inventory is the only viable path to a fast turnaround. ATI Accurate Technology stocks obsolete and long-lead IGBT modules precisely for these situations, providing procurement teams and maintenance engineers a dependable alternative when the factory cannot respond in time.

ATI Accurate Technology is located in Palmetto, Florida, and specializes in IGBTs, thyristors, diodes, and rectifier modules — including obsolete and hard-to-find components like the 1MBI400NN-120. Orders placed before 5PM EST ship same day. Contact our team for real-time stock confirmation, datasheet support, and volume pricing. Call 239-734-7566 or email sales@igbts.us.