Content last revised on November 12, 2025
SEMIKRON SKKD 164F17 | High-Reliability Thyristor/Diode Module for Controlled Power Conversion
The SEMIKRON SKKD 164F17 is an industry-proven power module engineered for robust and precise control in high-current applications. As a member of the renowned SEMIPACK® family, this component is not a standard IGBT but a highly reliable Thyristor/Diode module. It is specifically designed for phase control rectification, offering engineers a powerful and cost-effective solution for managing AC and DC power flows.
- Core Technology: Dual Thyristor (SCR) configuration in a common cathode half-bridge topology.
- Voltage Class: 1700V blocking voltage for high mains voltage compatibility.
- Current Handling: Average on-state current (ITAV) of approximately 164A.
- Key Advantage: Delivers precise phase-angle control, enabling efficient and adjustable power output for demanding industrial loads.
An Engineer's Deep Dive into the Technology
The performance of the SEMIKRON SKKD 164F17 is rooted in two core design principles: superior silicon technology and exceptional packaging. This combination ensures not just electrical performance but also long-term operational reliability.
First, the module leverages glass passivated thyristor chips. This manufacturing technique is critical for achieving a stable and high blocking voltage (VDRM/VRRM) of 1700V. The glass passivation protects the sensitive junction termination area from environmental contaminants and electrical field stress, preventing premature failure and ensuring consistent performance across a wide temperature range. This directly translates to a more resilient system, especially in applications subject to grid voltage fluctuations.
Second, the module is housed in the SEMIPACK® 2 package. This industry-standard housing features an isolated metal baseplate made from Aluminum Nitride (AlN) or Alumina (Al2O3) ceramic. This design provides excellent electrical isolation while ensuring a low thermal resistance path to the heatsink. For a design engineer, this simplifies thermal management, reduces system assembly complexity, and enhances the overall power cycling capability of the end-product.
Key Electrical & Thermal Specifications
The following table outlines the critical performance parameters for the SKKD 164F17, providing a quick reference for system design and simulation. For comprehensive data, including characteristic curves and SOA graphs, download the family datasheet.
| Parameter | Value |
|---|---|
| Repetitive Peak Off-State Voltage (VDRM, VRRM) | 1700 V |
| Average On-State Current (ITAV @ Tc=85°C) | 164 A |
| RMS On-State Current (ITRMS) | 250 A |
| Surge Current (ITSM, 10ms) | 4500 A |
| Isolation Voltage (Visol, AC 1 min) | 3600 V |
| Operating Junction Temperature (Tvj op) | -40°C to +130°C |
| Thermal Resistance, Junction to Case (Rth(j-c)) | 0.14 K/W per thyristor |
Application Scenarios & Value Proposition
The specific characteristics of the SEMIKRON SKKD 164F17 make it an ideal choice for applications where controlled rectification is paramount. Its value is demonstrated across several key industrial sectors:
- Controlled Rectifiers: In applications like industrial DC power supplies and battery chargers, the SKKD 164F17 allows for precise regulation of the output DC voltage by adjusting the firing angle of the thyristors. This is far more efficient than simple diode rectifiers with downstream DC-DC conversion for bulk power control.
- AC Voltage Controllers & Soft Starters: For large induction motors, this module enables soft-start functionality. By gradually increasing the voltage applied to the motor, it reduces massive inrush currents, minimizing mechanical stress on drivetrains and reducing voltage sag on the local grid.
- Static VAR Compensators (SVC): In power quality systems, these thyristor modules are used to switch capacitor banks or reactors, providing dynamic power factor correction and stabilizing the grid. The high voltage and current ratings of the module are essential for this demanding utility-scale application.
Expert FAQ for the SKKD 164F17
Here are answers to common questions engineers have when integrating this type of module:
- What are the gate drive requirements?Thyristors require a specific pulse of gate current (IGT) to turn on. Unlike IGBTs, they do not require a continuous gate voltage. A short, sharp pulse is sufficient. Once latched on, the gate signal can be removed. Ensure your gate drive circuit can supply the required current specified in the datasheet, especially at low temperatures.
- How does this compare to using discrete thyristors?While discrete components offer layout flexibility, the SEMIKRON SKKD 164F17 module offers significant advantages: a pre-engineered, isolated package simplifies heatsink mounting, reduces parasitic inductance, and guarantees thermal performance. This dramatically cuts down assembly time and design risk for high-power systems.
- Can this module be used for inverter applications?No. Thyristors are not self-commutating devices; they can be turned on via the gate but only turn off when the current through them falls to zero (line commutation) or through a separate forced commutation circuit. For high-frequency switching applications like inverters, you should select from our wide range of IGBT modules.
In an era dominated by advanced wide-bandgap semiconductors, the robust and cost-effective thyristor remains an essential workhorse for high-power control. For applications requiring reliable phase-angle control and rectification, the SKKD 164F17 offers a proven, high-performance solution. To discuss your specific application needs or to compare this module with other power conversion technologies, please contact our technical team.
