Semikron SKKD 162/18 Thyristor/Diode Module | High-Reliability Power Control for Industrial Applications
The Semikron SKKD 162/18 is a high-performance thyristor/diode module engineered for robust power control in demanding industrial environments. Housed in the proven SEMIPACK® 2 package, this module integrates two series-connected thyristors in a common cathode configuration, making it an ideal building block for phase-controlled rectifiers, AC voltage controllers, and motor soft starters. Its combination of high current capacity, superior voltage rating, and exceptional ruggedness provides a reliable foundation for high-power conversion systems.
Core Product Features In-Depth
The SKKD 162/18 distinguishes itself through its advanced packaging and electrical resilience, offering tangible benefits in performance and system longevity.
Robust SEMIPACK® 2 Package with Insulated Baseplate
A key differentiator of the SKKD 162/18 is its utilization of Semikron's SEMIPACK® 2 package, which features pressure contact technology and an integrated DCB (Direct Copper Bonded) aluminum oxide (Al₂O₃) ceramic insulator. Unlike conventional soldered modules, the pressure contact system ensures uniform force distribution across the silicon chips, significantly enhancing reliability under thermal cycling. The insulated baseplate eliminates the need for external isolation materials, streamlining the assembly process and reducing component count. This design not only simplifies mechanical mounting but also facilitates more efficient heat extraction from the semiconductor to the heatsink, improving thermal performance and enabling more compact system designs. For engineers, this translates to lower assembly costs, reduced risk of thermal fatigue failures, and increased operational lifespan in harsh industrial settings.
Exceptional Surge Current and High Blocking Voltage
The SKKD 162/18 is engineered to withstand severe electrical stress, a critical requirement for industrial power systems. It boasts an impressive non-repetitive surge current rating (ITSM) of 4500A, providing an outstanding safety margin against grid faults, load short-circuits, and the high inrush currents typical of large motor starting. Furthermore, the "/18" variant offers a repetitive peak reverse voltage (VRRM) of 1800V. This high blocking voltage capability makes the module exceptionally well-suited for direct operation on 480V or even 600V industrial mains, ensuring unwavering operational stability even in the presence of line voltage transients. This level of electrical ruggedness directly enhances system resilience, minimizes downtime, and reduces the need for costly external protection circuits.
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Typical Application Scenarios and Innovative Value
The specific characteristics of the Semikron SKKD 162/18 deliver significant value across several key industrial applications.
- Controlled Rectifiers for DC Power Supplies: In applications like industrial electroplating, welding equipment, or large-scale battery charging systems, the SKKD 162/18 enables the construction of powerful and precisely regulated DC power sources. Its 160A average current rating handles substantial loads, while its phase-control capability allows for adjustable DC output. The module's thermal efficiency ensures stable, long-term operation under continuous heavy load conditions.
- Motor Soft Starters: For controlling large AC induction motors, the module's exceptional surge current handling is paramount. The SKKD 162/18 can safely manage the immense inrush currents during motor startup, preventing mechanical shock to machinery and mitigating voltage sags on the power grid. Its insulated package simplifies integration into compact motor control center (MCC) cabinets.
- AC Voltage Controllers: The dual thyristor topology is perfectly suited for building AC-AC converters used in applications like industrial heating control or high-power lighting dimmers. The SKKD 162/18 provides smooth, reliable power regulation, and its robust thermal design minimizes cooling requirements, even when managing kilowatts of power, leading to more efficient and compact controller designs.
For tailored solutions or to discuss your specific application needs, feel free to contact our technical experts for a quote.
Key Technical Parameters Overview
The following table outlines the critical performance specifications for the SKKD 162/18 module:
| Parameter | Value |
|---|---|
| Average On-state Current (ITAV) | 160 A (Tc = 85 °C) |
| Repetitive Peak Reverse/Off-state Voltage (VRRM/VDRM) | 1800 V |
| Surge On-state Current (ITSM) | 4500 A (10 ms, 50 Hz) |
| On-state Threshold Voltage (VT0) | 0.85 V |
| On-state Slope Resistance (rT) | 2.5 mΩ |
| Isolation Voltage (Visol) | 3000 V~ (2500 V~ for UL) |
| Package Type | SEMIPACK® 2 |
For a complete list of specifications, please refer to the official Semikron SKKD 162/18 datasheet.
Comparative Analysis and Selection Advice
Choosing the right power module is crucial for system performance and cost-effectiveness. Here’s how the SKKD 162/18 compares to other solutions:
SKKD 162/18 vs. an IGBT CIB (Converter-Inverter-Brake) Module:
An IGBT-based module, such as a Fuji Electric 6MBI series, is designed for high-frequency Pulse-Width Modulation (PWM) applications like variable frequency drives (VFDs) and modern switch-mode power supplies. While highly efficient, IGBTs are less tolerant of the massive, line-frequency surge currents that thyristors can handle.
Selection Advice: Choose the Semikron SKKD 162/18 for line-frequency (50/60 Hz) applications requiring extreme ruggedness and simple phase control, such as soft starters, controlled rectifiers, and AC controllers. Opt for an IGBT CIB module when your application demands high-frequency switching for precise motor speed control (VFD) or high-efficiency DC-DC/DC-AC conversion.
SKKD 162/18 vs. a Standard Soldered Thyristor Module:
While other manufacturers offer thyristor modules with similar voltage and current ratings, many use traditional solder-bond technology. The Semikron SKKD 162/18’s pressure contact system within the SEMIPACK® package provides inherently superior resilience to thermal fatigue caused by repeated temperature swings.
Selection Advice: For applications in stable thermal environments, a standard soldered module may suffice. However, for systems subjected to frequent on/off cycles, heavy load variations, or harsh ambient conditions, the Semikron SKKD 162/18 is the superior choice for maximizing system lifetime and reliability.
