Semikron SKKT162/12E | Robust Thyristor/Diode Module for Reliable Power Control
The Semikron SKKT162/12E is an industry-proven power module engineered for high-reliability applications requiring precise control of AC or DC power. Housed in the compact and thermally efficient SEMITOP® 2 package, this module integrates two thyristors and two diodes, making it a cornerstone component for designers of industrial power conversion systems. Its robust construction and well-defined electrical characteristics ensure predictable performance and long service life in demanding environments.
Key Product Highlights
- High Voltage Capability: With a repetitive peak off-state voltage (VDRM) of 1200V, it provides a substantial safety margin for line-voltage applications up to 480V AC.
- Proven Reliability: Features glass passivated thyristor chips, a technology renowned for its excellent blocking stability and long-term reliability under harsh thermal and electrical conditions.
- Thermally Efficient Design: The SEMITOP® package utilizes an Alumina (Al2O3) ceramic DCB (Direct Copper Bonded) substrate, offering superior thermal conductivity and high electrical isolation, simplifying heatsink design and assembly.
- Versatile Configuration: The common cathode thyristor pair configuration is optimized for AC controllers and single-phase controlled rectifiers, reducing system complexity and component count.
Key Parameters Overview
For engineers requiring quick-reference data, the table below summarizes the critical performance characteristics of the SKKT162/12E. For comprehensive specifications and performance curves, you can download the official Semikron SKKT162/12E datasheet.
| Parameter | Value |
|---|---|
| Repetitive Peak Off-State Voltage (VDRM) | 1200 V |
| Average On-State Current (ITAV) | 160 A (Tcase = 72 °C) |
| RMS On-State Current (ITRMS) | 250 A |
| Surge On-State Current (ITSM) | 3300 A (10 ms, 50 Hz) |
| Thermal Resistance, Junction to Case (Rth(j-c)) | 0.15 K/W (per thyristor) |
| UL Recognized | File E63532 |
Application Scenarios & Engineering Value
The SKKT162/12E is not a general-purpose switch; it is a specialist component designed to excel in low-to-medium frequency phase control applications where robustness and cost-effectiveness are paramount.
- AC Motor Soft Starters: By precisely controlling the firing angle of the thyristors, this module can gradually ramp up the voltage supplied to an AC induction motor. This minimizes mechanical shock on drive trains and drastically reduces electrical inrush currents, extending motor life and preventing nuisance tripping of circuit breakers.
- Controlled Rectifiers: It serves as the core of single-phase controlled bridge rectifiers, enabling the creation of variable DC voltage supplies. This is essential for applications like DC motor speed control and battery charging systems where the output voltage must be actively regulated.
- Industrial Heating and Lighting Control: For high-power resistive loads such as industrial furnaces or large-scale lighting installations, the SKKT162/12E provides an efficient method of power regulation through phase-angle control, offering more precise and reliable performance than mechanical contactors.
Technical Deep Dive: The Engineering Behind the Specs
Glass Passivation for Unmatched Stability
The term "glass passivated" refers to a critical manufacturing step where a layer of specialized glass is applied to the surface of the silicon die, sealing the high-voltage junctions from ambient contaminants. In an industrial setting, this translates directly to superior long-term performance. It prevents degradation of blocking voltage characteristics over years of service, a common failure point in lesser components. This makes the SKKT162/12E a "fit and forget" solution for critical infrastructure where maintenance is difficult or costly.
The SEMITOP® Package Advantage
The module's package is integral to its performance. The SEMITOP® 2's isolated baseplate design eliminates the need for separate insulating thermal pads, reducing thermal resistance and simplifying the mechanical design of the overall system. This direct-to-heatsink mounting approach ensures optimal heat extraction, allowing the module to operate at higher power levels reliably. Its low profile is also a significant benefit in modern, power-dense cabinet designs. For a deeper understanding of the various power semiconductor technologies, see our guide to power semiconductor selection.
Frequently Asked Questions (FAQ)
Q: What is the main difference between this thyristor module and an IGBT module?
A: The fundamental difference lies in their control mechanism and application focus. A thyristor, once triggered by a gate pulse, will latch 'on' and continue conducting as long as current flows through it. It turns off only when the current falls to zero (e.g., at an AC zero-crossing). An IGBT, however, is a fully controllable switch that can be turned on and off at will via its gate. This makes thyristors like the SKKT162/12E ideal for low-frequency phase control, while IGBT modules are essential for high-frequency Pulse Width Modulation (PWM) found in modern Variable Frequency Drives (VFDs) and solar inverters.
Q: Can the SKKT162/12E be paralleled for higher current capacity?
A: While possible, paralleling thyristors requires careful design to ensure current sharing. This typically involves matching device parameters (VT0) and using small series inductors or resistors to balance dynamic and static currents. For applications requiring significantly higher current, it is often more reliable and cost-effective to select a single, larger module designed for that purpose. For specific design guidance, it's best to contact our technical team for an application review.
