The Infineon FZ1800R12KF4S1 is a high-current IGBT module from Infineon's proven KF4S1 platform, combining an 1800A continuous collector current rating with a 1200V blocking voltage in a robust, industry-standard housing. Designed for low conduction and switching losses, this module integrates fast-switching IGBT chips with co-packed free-wheeling diodes, making it well-suited for high-power converter topologies where thermal efficiency and switching performance are equally critical. Its isolated baseplate construction simplifies heatsink integration in densely packaged power stacks.

The FZ1800R12KF4S1 sees wide deployment across heavy industrial and infrastructure applications including medium-voltage AC motor drives, regenerative drive systems, rail traction inverters, wind turbine converters, large UPS systems, and industrial induction heating equipment. Wherever high bus voltages, large load currents, and continuous duty cycles converge, this module's thermal headroom and rugged construction provide the reliability margins that maintenance engineers and OEM designers depend on to meet uptime requirements.

Quick Reference: FZ1800R12KF4S1

Key Features of the FZ1800R12KF4S1:

• 1800A rated collector current with 1200V VCES — built for extreme power density applications
• Co-packaged fast-recovery free-wheeling diodes for reduced external component count and optimized switching waveforms
• Low VCEsat characteristics minimize conduction losses at high duty cycles, reducing heatsink and cooling system requirements
• Isolated copper baseplate construction provides electrical isolation while enabling direct mounting to standard liquid or air-cooled heatsinks
• Optimized for both hard-switching and soft-switching converter topologies across industrial frequency ranges
• Gate drive compatible with standard Infineon IGBT driver ICs and established driver board designs, simplifying drop-in replacement scenarios

The FZ1800R12KF4S1 has been discontinued by Infineon, and new factory production carries a lead time exceeding 99 weeks — effectively making spot market and distributor stock the only practical sourcing path for most procurement timelines. For maintenance operations facing equipment downtime or OEM production lines dependent on legacy designs, waiting on new production is rarely a viable option. ATI Accurate Technology maintains verified inventory of obsolete and long-lead-time Infineon IGBT modules specifically to support customers in these situations, with full traceability on all new OEM stock.

ATI Accurate Technology is a power semiconductor specialist located in Palmetto, Florida, stocking IGBTs, thyristors, diodes, and rectifier modules — including obsolete and hard-to-find parts like the FZ1800R12KF4S1. Orders placed before 5PM EST ship same day. Contact our team for pricing, availability confirmation, and volume or blanket order arrangements. Call 239-734-7566 or email sales@igbts.us.