The Semikron SKKT90/12 is a dual SCR (thyristor) power module engineered for demanding phase-control and AC switching applications. Rated at 90A average on-state current (IT(AV)) and a 1200V repetitive peak off-state voltage (VDRM/VRRM), this module features an isolated copper base and Semikron's proven pressure-contact chip technology. Its robust construction provides high surge current capability and excellent thermal performance when mounted to a suitable heatsink, making it a reliable solution for high-power industrial environments where uptime and thermal stability are critical.

The SKKT90/12 is widely deployed in industrial AC motor soft starters, medium-voltage DC drives, resistance welding controllers, AC power regulators, and electrochemical process equipment. Its dual SCR configuration in a single package simplifies circuit board layout for antiparallel or series AC switching topologies. Power conversion system designers also specify this module in UPS systems, induction heating controllers, and crane and hoist drive platforms where controlled rectification and robust gate triggering under full-load conditions are essential operating requirements.

Quick Reference: SKKT90/12

Key Features of the SKKT90/12:

• Dual SCR topology in a single isolated module — simplifies antiparallel AC switch and controlled rectifier designs
• 1200V VDRM/VRRM blocking voltage with high dV/dt and dI/dt ratings for robust commutation performance
• 90A IT(AV) continuous on-state current rating with high ITSM surge current capability for fault tolerance
• Isolated aluminum oxide (Al₂O₃) or equivalent ceramic base for direct heatsink mounting without additional isolation hardware
• Low thermal resistance (RthJC) enabling high power density installations in space-constrained drive and rectifier assemblies
• Compatible with standard Semikron SKKT footprint — direct form-fit-function replacement within existing drive platforms

The SKKT90/12 carries a factory lead time of approximately 30 weeks for new production, which presents a genuine procurement challenge for maintenance teams managing unplanned downtime or capital project timelines. Semikron thyristor modules in this current and voltage class are frequently specified in legacy drive systems that remain in service well beyond original product lifecycles. ATI Accurate Technology actively maintains sourcing networks for exactly these situations—whether you need a single emergency replacement or are building buffer stock to protect critical production assets.

ATI Accurate Technology is headquartered in Palmetto, Florida and ships the same day on orders placed before 5PM EST. Our team specializes in IGBTs, thyristors, diodes, and rectifier modules—including obsolete and long lead time parts like the SKKT90/12. Call us at 239-734-7566 or email sales@igbts.us for real-time availability, lead time updates, and volume pricing. We support MRO buyers, OEM procurement teams, and drive repair facilities nationwide.