The SKKT105/18E is a dual thyristor (SCR) module from SEMIKRON rated for 105A average on-state current (IT(AV)) and a 1800V repetitive peak off-state voltage (VDRM/VRRM). Housed in the industry-standard SKKT package with isolated baseplate, this module is engineered for high-reliability phase control and AC-to-DC rectification in demanding industrial power electronics systems. Its robust construction, low thermal resistance, and proven SEMIKRON gate drive compatibility make it a trusted solution for OEM and MRO applications requiring consistent performance under continuous load cycles.

The SKKT105/18E is widely deployed in industrial AC motor drives, DC motor speed controllers, resistance welding equipment, industrial heating and temperature control systems, and three-phase rectifier bridges. Its high blocking voltage rating makes it well suited for 690V AC line applications, while the 105A current rating supports medium-to-high power converter topologies. Power conversion equipment in steel mills, paper mills, crane drives, and oil field machinery frequently relies on this thyristor module family for long-term, dependable operation in harsh electrical environments.

Quick Reference: SKKT105/18E

Key Features of the SKKT105/18E:

• 1800V repetitive peak off-state voltage (VDRM/VRRM) for use on 690V AC bus systems with adequate voltage margin
• 105A average on-state current (IT(AV)) supporting medium and high-power three-phase converter and rectifier topologies
• Isolated copper baseplate for direct heatsink mounting, simplifying thermal management in modular drive assemblies
• Low thermal resistance junction-to-case (Rthjc) enabling high power density designs with standard forced-air or liquid cooling
• Gate-cathode characteristics optimized for compatibility with standard SEMIKRON and third-party thyristor firing cards
• Dual thyristor configuration in a single module reduces component count, interconnect inductance, and assembly complexity in bridge circuits

The SKKT105/18E carries a factory lead time of approximately 35 weeks for new production from SEMIKRON, placing it firmly in the long lead time category that creates serious scheduling risk for maintenance departments and contract manufacturers alike. Equipment downtime waiting on a single thyristor module is a costly reality in industrial environments. ATI Accurate Technology actively sources hard-to-find and long lead time SEMIKRON modules through authorized and vetted supply channels, giving procurement teams an alternative path to securing critical inventory ahead of scheduled outages or unexpected failures.

ATI Accurate Technology is based in Palmetto, Florida and ships same-day on orders placed before 5PM EST. Whether you need a single replacement module or volume production quantities, our team is ready to help. Contact us at 239-734-7566 or sales@igbts.us for real-time availability, lead time updates, and volume pricing on the SKKT105/18E and the full SEMIKRON thyristor module line.