Content last revised on November 12, 2025
SEMIKRON SKET400/16 E | High-Reliability Thyristor/Diode Module for Power Control
The SEMIKRON SKET400/16 E is an engineered solution for robust, high-current power control applications. It is not designed for high-frequency switching like an IGBT, but rather provides exceptional reliability and simplicity in phase control and rectification circuits. This module integrates a thyristor (SCR) and a diode in a single, industry-standard SEMIPACK® 2 package, offering a streamlined component for engineers building cost-effective and durable power conversion systems.
Core Engineering Advantages
- High Power Density: With a 400A average forward current and a 1600V repetitive peak reverse voltage rating, it is built to manage substantial power loads with a significant safety margin.
- Integrated Topology: The thyristor/diode configuration is ideal for single-phase AC controllers and half-controlled bridge rectifiers, reducing component count and simplifying PCB layout and assembly.
- Proven Robustness: Utilizes pressure contact technology, which eliminates fatigue-prone solder layers, resulting in superior thermal performance and mechanical resilience against vibration and shock.
- Enhanced Electrical Isolation: Features an insulated baseplate (Al2O3 ceramic), providing 3600V isolation voltage (VISOL), which simplifies thermal management and enhances overall system safety.
Application Deep Dive: Where the SKET400/16 E Excels
The specific design of the SEMIKRON SKET400/16 E makes it a first-choice component in applications where precise, low-frequency control and unwavering reliability are paramount.
- DC Motor Drives: In half-controlled bridge configurations, this module provides efficient and robust speed and torque control for DC motors. Its inherent ruggedness is a significant advantage in demanding industrial environments like conveyors, mixers, and pumps.
- AC Soft Starters: By employing phase-angle control, the SKET400/16 E can smoothly ramp up the voltage supplied to large AC induction motors. This mitigates high inrush currents, reducing electrical stress on the grid and mechanical shock to the machinery.
- Industrial Heating and Electroplating: For high-power resistive loads, this module offers a simple and effective method for power regulation. Its ability to handle large currents makes it perfect for controlling industrial furnaces, large-scale lighting systems, and electroplating rectifiers where precise current control is critical.
Key Technical Specifications
The following parameters highlight the performance capabilities of the SEMIKRON SKET400/16 E. For a complete overview, you can download the official datasheet.
| Parameter | Value |
|---|---|
| Average On-state Current (ITAV) @ Tcase = 85°C | 400 A |
| Repetitive Peak Reverse Voltage (VRRM) / Repetitive Peak Off-state Voltage (VDRM) | 1600 V |
| Threshold Voltage (VT(TO)) | 0.9 V |
| Slope Resistance (rT) | 0.9 mΩ |
| Thermal Resistance, Junction to Case (Rth(j-c)) per arm | 0.09 °C/W |
| I²t Value for Fusing | 325,000 A²s |
Engineering Breakdown: Reliability by Design
The long-term performance of a power module is determined by its internal construction. The SEMIKRON SKET400/16 E incorporates two critical design philosophies. Firstly, the silicon thyristor and diode chips are glass passivated. This process seals the sensitive p-n junctions from ambient humidity and contaminants, ensuring stable blocking voltage characteristics and preventing degradation over years of service. Secondly, it leverages pressure contact technology. This solder-free design creates a direct pressure connection between the silicon die and the electrical terminals, dramatically improving thermal cycling capability and resilience to mechanical stress compared to conventional soldered modules.
Frequently Asked Questions (FAQ)
1. How does this Thyristor/Diode module differ from modern IGBT modules?
A thyristor is a latching device primarily used for low-frequency (50/60 Hz) phase control or as a rectifier. Once triggered, it remains on until its current falls below the holding current. In contrast, IGBT modules are high-frequency, fully controllable switches used in applications like PWM inverters, allowing for precise control over both voltage and frequency.
2. What are the gate drive requirements for this module?
Unlike the voltage-controlled gate of an IGBT, a thyristor requires a current pulse into its gate to turn on. For inductive loads, it's critical to provide either a continuous gate current or a strong, prolonged initial pulse to ensure the anode current rises above the latching current, guaranteeing a full and reliable turn-on. A simple, low-cost gate drive circuit is usually sufficient.
For detailed application support or to discuss how the SKET400/16 E can fit into your design, please contact our technical team.
