The Mitsubishi QM300HH-H is a high-current IGBT module engineered for high-frequency switching and reliable power conversion in industrial drive and inverter systems. Built to Mitsubishi's proven H-series specifications, this module integrates IGBT chips with freewheeling diodes to deliver low saturation voltage, tight switching characteristics, and stable performance across a wide thermal operating range. For engineers requiring dependable performance in demanding environments, the QM300HH-H represents a mature, field-proven solution with a well-established application base across global OEM platforms.

The QM300HH-H is widely deployed in AC motor drives, servo amplifiers, UPS systems, induction heating equipment, and industrial inverters where high continuous current capability and efficient switching losses are critical. It is commonly found in CNC machinery, crane and hoist drives, pump and fan variable-frequency drives, and regenerative braking systems. OEMs and MRO teams servicing legacy Mitsubishi-based drive platforms frequently specify this module as a direct replacement, making reliable stock availability a priority for minimizing unplanned downtime.

Quick Reference: QM300HH-H

Key Features of the QM300HH-H:

• 300A continuous collector current rating for high-power industrial drive applications
• 1200V VCES blocking voltage providing robust margin in 600V bus systems
• Integrated freewheeling diodes optimized for low reverse recovery loss and reduced EMI
• Low VCE(sat) characteristics minimizing conduction losses and thermal stress at full load
• Isolated baseplate construction enabling direct heatsink mounting with standard thermal interface materials
• Compatible with Mitsubishi H-series gate drive requirements, simplifying drop-in replacement in existing designs

With a current factory lead time of 43 weeks on new production, sourcing the QM300HH-H through standard distribution channels presents a significant risk for both scheduled maintenance and emergency repairs. For facilities running Mitsubishi-based drive platforms, a single failed module can idle critical production equipment for nearly a year if not sourced from independent stock. ATI Accurate Technology maintains inventory of hard-to-find, long-lead-time, and obsolete power semiconductors precisely to address this gap — providing verified new OEM parts when and where they are needed most.

ATI Accurate Technology is a power semiconductor distributor based in Palmetto, FL, specializing in IGBTs, thyristors, diodes, and rectifier modules. We ship same-day on orders placed before 5PM EST, and offer volume pricing for MRO programs and OEM procurement. Contact our team directly at 239-734-7566 or sales@igbts.us to confirm availability, request a quote, or discuss blanket order options for the QM300HH-H.