The SEMIKRON SKKT122/18E is a dual thyristor (SCR) module from the SEMIPACK series, rated for 122A average on-state current (IT(AV)) and 1800V repetitive peak off-state voltage (VDRM/VRRM). Configured as two thyristors in a common-cathode or common-anode arrangement, this module is engineered for phase-controlled rectification, AC power controllers, and soft-start circuits. Its isolated copper base plate and pressure-contact construction ensure low thermal resistance and reliable heat transfer to external heatsinks, making it suitable for continuous-duty industrial power environments.

The SKKT122/18E is widely deployed in heavy industrial applications including DC motor drives, resistance heating controllers, crane and hoist drive systems, industrial welding equipment, and electrochemical process rectifiers. Its robust 1800V voltage rating provides the necessary margin for 690V AC line applications where transient overvoltages are common. The module is also found in UPS systems, soft starters, and power regulation stages within steel mills, paper mills, and mining equipment where reliable phase-control thyristors are mission-critical components.

Quick Reference: SKKT122/18E

Key Features of the SKKT122/18E:

• 1800V VDRM/VRRM repetitive peak off-state voltage rating, providing robust margin on 690V AC bus applications
• 122A average on-state current (IT(AV)) with low on-state voltage drop (VT) for reduced conduction losses in continuous-duty operation
• Dual thyristor topology in a single SEMIPACK package enables compact B2 half-controlled or B6 fully controlled bridge configurations
• Isolated copper base plate with standard bolt-down mounting for optimized thermal contact to industry-standard heatsink profiles
• High surge current capability (ITSM) suitable for inrush-prone loads such as transformer primaries and motor soft-start circuits
• Gate-cathode characteristics designed for reliable triggering with standard SCR gate driver circuits across the full operating temperature range

The SKKT122/18E carries a factory lead time of approximately 35 weeks for new production from SEMIKRON, a timeline that can critically impact maintenance schedules and capital equipment projects. For OEMs managing end-of-life equipment or facilities engineering teams dealing with unplanned drive failures, waiting on factory lead times is not always an option. ATI Accurate Technology actively sources SEMIPACK thyristor modules through authorized and independent distribution channels, giving procurement teams access to inventory that bypasses extended factory queues. Contacting ATI early in your procurement cycle is strongly recommended for this part.

ATI Accurate Technology is based in Palmetto, Florida and specializes in power semiconductors including IGBTs, thyristors, diodes, and rectifier modules — with a focus on hard-to-find and long-lead-time components. Orders confirmed before 5PM EST ship same day. For pricing, lead time, and volume inquiries on the SKKT122/18E, contact our team directly at 239-734-7566 or sales@igbts.us. Volume pricing is available for MRO stocking orders and OEM production builds.