The IRKT56-12 is a high-voltage SCR/diode (thyristor/diode combination) power module manufactured by International Rectifier (IR), rated for 56A average on-state current and 1200V repetitive peak off-state voltage (VDRM/VRRM). Housed in a standard isolated base package, this module integrates one SCR and one diode in a half-bridge configuration, making it well-suited for phase-controlled rectifier stages and regenerative drive topologies. Its robust silicon construction and low thermal resistance support reliable continuous operation in demanding industrial environments.

The IRKT56-12 sees widespread use in industrial AC/DC converters, DC motor drives, soft starters, crane and hoist controls, welding power supplies, and UPS front-end rectifier stages. Its half-bridge topology simplifies the design of three-phase controlled rectifiers and regenerative braking circuits. The module is also found in legacy elevator drives, extruder controls, and process line power systems — equipment categories where exact form-fit-function replacement is non-negotiable and approved alternative sourcing is tightly restricted by OEM specifications.

Quick Reference: IRKT56-12

Key Features of the IRKT56-12:

• 56A average on-state current (IT(AV)) with 1200V repetitive peak blocking voltage in a compact isolated-base module
• Half-bridge SCR/diode configuration supports phase-controlled rectification and regenerative converter designs without external diode additions
• Low thermal resistance junction-to-case (RthJC) enables high power density designs with standard heatsink mounting
• Gate trigger current (IGT) and holding current (IH) parameters optimized for compatibility with common thyristor firing boards and gate driver circuits
• Isolated copper baseplate construction provides electrical isolation between the power circuit and heatsink, simplifying thermal management and system safety compliance
• Direct form-fit-function replacement for failed modules in existing equipment — identical mounting footprint and terminal layout to established IR industry standards

With a published factory lead time of 99 weeks on new production, the IRKT56-12 presents a genuine procurement challenge for maintenance teams and MRO buyers supporting active production lines. Extended lead times at this level effectively mean new orders will not arrive in time for most unplanned repair scenarios. Equipment using these modules — particularly older drives and converters — cannot simply wait two years for a replacement. Stocking distributors with verified OEM inventory are the only practical solution when a production-critical system goes down. Securing spares inventory now is the lowest-risk strategy for facilities operating equipment dependent on this module.

ATI Accurate Technology, based in Palmetto, Florida, maintains ready inventory of the IRKT56-12 and ships same-day on orders received before 5PM EST. We specialize in hard-to-find, long-lead-time, and obsolete power semiconductors — including IGBTs, SCRs, diodes, and rectifier modules. Volume pricing is available for MRO stocking orders. Contact our team at 239-734-7566 or sales@igbts.us to check current stock levels and lead times.