Content last revised on January 18, 2026
SEMIKRON SKKT 250/14E Thyristor/Diode Module | 1400V 250A SEMIPACK 3
The SKKT 250/14E is a high-performance Thyristor/Diode Module engineered for robust power control in demanding industrial environments. Utilizing the industry-standard SEMIPACK 3 housing, this module integrates a thyristor and a diode in a series configuration, optimized for high-voltage rectification and AC power regulation. With a repetitive peak off-state voltage of 1400V and a mean on-state current of 250A, it provides the necessary headroom for 400V to 480V power lines. What is the primary benefit of its pressure-contact design? It ensures superior thermal cycling reliability by eliminating the solder fatigue common in lower-grade components. For engineers managing high-inertia industrial loads, the SKKT 250/14E offers the thermal stability required to minimize downtime in mission-critical drives.
For systems prioritizing maximum voltage overhead in 600V environments, the 1400V rating of this module provides an essential safety margin against transient voltage spikes. Best Fit Conclusion: For industrial motor starters requiring high surge current durability, this 1400V 250A module is the optimal choice.
Application Scenarios & Value
Achieving System-Level Reliability in High-Inertia Motor Controls
In heavy-duty industrial applications, such as large-scale conveyor systems or centrifugal fans, the startup phase introduces significant electrical stress. The SKKT 250/14E addresses this challenge through its exceptional surge current ($I_{TSM}$) rating of 9100A (at 10ms). This parameter acts like a high-capacity floodgate, allowing the module to withstand massive inrush currents during motor acceleration without thermal degradation. This capability is critical for Soft Starters and Variable Frequency Drives (VFD) where component failure during startup can lead to costly system-wide shutdowns.
Furthermore, the SKKT 250/14E is frequently utilized in Industrial Heating controls and Welding Power Supplies. Its ability to maintain a low forward voltage drop reduces power losses, directly enhancing the Thermal Management efficiency of the entire cabinet. While this model is ideal for balanced performance, for systems requiring higher current handling, the related SKKT 250/16E offers a higher voltage ceiling of 1600V, whereas the SKKT 250/12E provides a cost-effective alternative for lower-voltage 380V grids. By selecting the SKKT 250/14E, designers ensure compliance with IEC 61800-3 standards for EMC and power quality in automated production lines.
Key Parameter Overview
Decoding Technical Specifications for Optimized Thermal Design
| Functional Grouping | Key Parameter | Value |
|---|---|---|
| Voltage Ratings | Repetitive Peak Reverse Voltage ($V_{RRM}$) | 1400V |
| Repetitive Peak Off-state Voltage ($V_{DRM}$) | 1400V | |
| Current Capacity | Mean On-state Current ($I_{T(AV)}$) @ $T_c = 85^circ C$ | 250A |
| Surge On-state Current ($I_{TSM}$) @ 10ms, $25^circ C$ | 9100A | |
| Thermal Characteristics | Thermal Resistance Junction to Case ($R_{th(j-c)}$) | 0.11 K/W |
| Maximum Junction Temperature ($T_vj$) | 125°C | |
| Mechanical Data | Housing / Package Type | SEMIPACK 3 |
Download the SKKT 250/14E datasheet for detailed specifications and performance curves.
FAQ
How does the $R_{th(j-c)}$ of 0.11 K/W affect the selection of a cooling system for the SKKT 250/14E?
The thermal resistance of 0.11 K/W is exceptionally low for this power class, meaning heat is transferred very efficiently from the semiconductor junction to the module's baseplate. For engineers, this allows for the use of more compact heat sinks while maintaining safe operating temperatures, or conversely, provides a larger safety margin in high-ambient temperature environments like Industrial Display control rooms or outdoor power enclosures.
Does the 1400V rating provide enough protection for a standard 480V three-phase input?
Yes. In a standard 480V AC system, the peak voltage is approximately 678V. A 1400V module provides more than double the operating peak voltage, offering a robust buffer against line transients and inductive kickback often found in Variable Frequency Drive (VFD) applications. This prevents premature module failure due to overvoltage stress.
Technical Deep Dive
Advanced Heat Transfer via Aluminum Oxide Ceramic Isolation
The internal architecture of the SKKT 250/14E utilizes a sophisticated Aluminum Oxide ($Al_2O_3$) ceramic isolated metal baseplate. This design provides 3000V isolation between the electrical terminals and the mounting surface, ensuring safety in multi-module configurations. From a physics perspective, the use of hard-soldered joints for the internal power chips significantly enhances the Power Cycling Capability. Think of the thermal resistance as a pipe's diameter; the smaller the resistance (0.11 K/W), the wider the "thermal pipe," allowing heat to flow out as effortlessly as water through a high-pressure valve. This prevents localized "hot spots" that typically cause semiconductor failure under continuous load.
For more technical insights into module selection, see our guide on the core trio of module selection or explore how Thermal Management dictates long-term reliability in power electronics.
Industry Insights & Strategic Advantage
Resilience in the Era of Grid Modernization and Energy Efficiency
As industrial sectors pivot toward Green Energy and high-efficiency automation, the reliability of power conversion components becomes a strategic priority. The SKKT 250/14E aligns with these trends by offering a high current density in a standardized SEMIPACK 3 footprint, allowing for easy integration into existing mechanical designs while supporting the latest Variable Frequency Drive (VFD) technologies. In the context of the global push for carbon neutrality, reducing switching losses and improving thermal efficiency at the component level—using modules with optimized VCE(sat) and $V_F$ characteristics—is essential for meeting stringent energy-saving regulations. The SKKT 250/14E remains a staple for distributors and OEMs who value verified performance over speculative new topologies, particularly in Solar Inverter stages and grid-tied energy storage systems.
For a deeper understanding of the competitive landscape, refer to our analysis on Semikron technology versus other market leaders, or visit Infineon for comparative data on similar high-power thyristor modules.
To request specific pricing for the SKKT 250/14E or to verify current availability, please contact our technical sales team for an immediate quote.
