The SEMIKRON SKKT72/22EH4 is a dual SCR thyristor module delivering 72A average on-state current and a 2200V repetitive peak off-state voltage (VDRM/VRRM). Built in SEMIKRON's proven SEMIPACK platform, this module integrates two thyristors in a common cathode or inverse-parallel configuration optimized for phase-controlled rectification and AC power regulation. The isolated copper base provides efficient thermal transfer to heatsinks, and the module's robust gate trigger characteristics ensure consistent firing performance across a wide operating temperature range. It meets the demands of continuous-duty industrial power conversion environments.

The SKKT72/22EH4 is a proven solution across heavy industrial applications including DC motor drives, crane and hoist control systems, resistance welding equipment, UPS systems, electrochemical rectifiers, and medium-voltage soft-start assemblies. Its 2200V voltage class provides the headroom required in 690V AC three-phase input topologies where transient overvoltages are a design concern. System integrators and OEM drive manufacturers specify this thyristor module when they need a field-proven, thermally efficient SCR pair in a mechanically standardized footprint compatible with existing SEMIPACK heatsink assemblies.

Quick Reference: SKKT72/22EH4

Key Features of the SKKT72/22EH4:

• 72A average on-state current (IT(AV)) with high surge current (ITSM) capability for robust overcurrent tolerance
• 2200V VDRM/VRRM voltage rating providing wide safety margin in 690V AC three-phase converter topologies
• Dual SCR configuration in SEMIPACK housing enables direct use in B6 or anti-parallel AC controller bridge designs
• Isolated aluminum oxide (Al₂O₃) base plate ensures electrical isolation up to 3000V RMS while maintaining low thermal resistance to heatsink
• Defined gate trigger current (IGT) and holding current (IH) parameters for predictable firing behavior with standard SCR gate driver circuits
• Compact SEMIPACK footprint with industry-standard mounting dimensions offering drop-in compatibility with legacy drive and rectifier assemblies

The SKKT72/22EH4 carries a factory lead time of approximately 28 weeks for new production, a reality that frequently creates critical shortages in drive repair, OEM production restarts, and capital equipment refurbishment projects. Long lead times on SEMIKRON SEMIPACK thyristors make early procurement planning essential. ATI Accurate Technology specializes in sourcing exactly these kinds of constrained, hard-to-find power semiconductor modules. Whether you need a single replacement unit or a production quantity, ATI's procurement network is built to locate and qualify genuine new OEM inventory when standard distribution channels fall short.

ATI Accurate Technology is headquartered in Palmetto, Florida and ships same-day on orders placed before 5PM EST. We specialize in IGBTs, thyristors, diodes, and rectifier modules — including obsolete and long-lead-time parts like the SKKT72/22EH4. Contact our team for real-time availability, volume pricing, and application support. Call 239-734-7566 or email sales@igbts.us — our power electronics specialists are ready to help you keep your systems running.