The SEMIKRON SKKT25/18 is a dual SCR (thyristor) module configured in a common cathode arrangement, delivering a 25A average on-state current and a 1800V repetitive peak off-state voltage (VDRM/VRRM). Built to SEMIKRON's SKKT platform, the module integrates two thyristors with an isolated copper base and Al₂O₃ ceramic substrate for reliable thermal transfer to a heatsink. The device's high blocking voltage and rugged gate trigger characteristics make it a dependable choice for demanding phase-controlled and line-commutated power conversion applications across a broad range of industrial sectors.

The SKKT25/18 sees extensive use in industrial AC/DC drives, soft starters, battery chargers, DC motor controllers, welding power supplies, and UPS front-end rectifiers. Its 1800V voltage class provides the necessary margin for 690V three-phase line applications where transient overvoltages must be safely absorbed. The module is equally at home in crane and hoist drives, electrochemical rectifiers, and heating control systems where precise phase-angle firing is essential to process stability and energy efficiency. Engineers specifying controlled rectifier bridges frequently pair SKKT modules in antiparallel or three-phase bridge topologies.

Quick Reference: SKKT25/18

Key Features of the SKKT25/18:

• Dual SCR common-cathode configuration enabling simplified three-phase and single-phase controlled rectifier circuit layouts
• 1800V VDRM/VRRM blocking voltage providing robust transient margin on 480V and 690V industrial supply networks
• Isolated Al₂O₃ ceramic substrate with copper base plate for low thermal resistance and reliable heatsink mounting
• Low threshold gate trigger current for compatibility with standard firing card and thyristor control ICs
• High surge current (ITSM) capability to handle system-level overcurrent events and startup inrush without latching failure
• SEMIKRON SKKT package footprint maintaining dimensional interchangeability with the established SKKT module family

The SKKT25/18 carries a factory lead time of approximately 39 weeks for new production orders from SEMIKRON, placing it firmly in the long-lead-time category that routinely disrupts MRO schedules and capital project timelines. For OEMs managing end-of-life drive platforms or maintenance teams facing an unplanned outage, waiting 39 weeks is simply not an option. ATI Accurate Technology actively sources hard-to-find and long-lead SEMIKRON modules through authorized and vetted supply channels, allowing procurement teams to secure genuine new OEM units well ahead of schedule or on an emergency basis without compromising part authenticity.

ATI Accurate Technology is based in Palmetto, Florida and specializes in IGBTs, thyristors, diodes, and rectifier modules — including obsolete and long-lead-time parts like the SKKT25/18. Orders placed before 5PM EST ship same day. For pricing, lead time confirmation, or volume orders, contact our team directly at 239-734-7566 or sales@igbts.us. Volume pricing is available for MRO stockers and OEM production builds.