The IRKT91/12 from International Rectifier is a thyristor-diode (SCR-diode) combination power module rated at 91 amperes and 1200 volts. This topology pairs a fast-recovery diode with a phase-control thyristor in a shared isolated baseplate package, enabling compact half-controlled bridge configurations without discrete component assembly. Designed for demanding industrial power conversion environments, the IRKT91/12 offers low on-state voltage drop, robust gate triggering characteristics, and a thermally efficient package that simplifies heatsink integration in high-density drive and rectifier assemblies.

The IRKT91/12 is widely deployed in AC variable-speed motor drives, three-phase soft starters, DC motor field supply controllers, regenerative rectifiers, and UPS front-end converters. Its half-controlled bridge building-block architecture is a proven solution in crane and hoist drives, extruder controls, metal processing lines, and mining equipment where controlled DC bus voltage and reliable phase control are essential. OEM drive manufacturers and MRO maintenance teams both rely on this module for original equipment replacement and field repair of legacy and current-production power conversion systems.

Quick Reference: IRKT91/12

Key Features of the IRKT91/12:

• 91A average on-state current (IT(AV)) with 1200V repetitive peak reverse and off-state voltage ratings for robust margin in 480–690V AC line applications
• Thyristor-diode topology enables half-controlled single-phase or three-phase bridge rectifier designs with reduced gate drive complexity
• Isolated copper baseplate construction allows direct heatsink mounting with full electrical isolation, simplifying mechanical and thermal design
• Low on-state voltage drop (VT) minimizes conduction losses and reduces heatsink size requirements in continuous-duty industrial installations
• Gate trigger current and latching current specifications optimized for compatibility with standard SCR gate driver ICs and firing boards
• Compact standardized module footprint facilitates drop-in replacement of failed units in existing drive and rectifier assemblies with no PCB or busbar modification

International Rectifier's IRKT91/12 carries a current factory lead time of approximately 43 weeks for new production orders — a serious risk for any operation facing an unplanned drive failure or scheduled maintenance outage. Industrial facilities running legacy AC drives, DC motor controllers, or phase-control rectifiers built around this module cannot afford to wait nearly a year for a replacement. Procurement professionals sourcing for MRO stock or project builds should secure inventory now. ATI specializes in exactly this scenario: stocking hard-to-find and long-lead-time power semiconductors so your equipment stays running without waiting on manufacturer production cycles.

ATI Accurate Technology is a power semiconductor distributor based in Palmetto, Florida, stocking IGBTs, thyristors, diodes, and rectifier modules from leading manufacturers. We ship same-day on orders received before 5PM EST, and our team is ready to support volume pricing, kitting, and urgent MRO requirements. Call us at 239-734-7566 or email sales@igbts.us to confirm availability, request a quote, or place an order for the IRKT91/12 today.