Semikron SKT240/12E Thyristor Module | Unmatched Reliability for High-Power Phase Control
The Semikron SKT240/12E is a high-performance thyristor/diode module engineered for demanding industrial power control applications. Housed in the rugged SEMIPACK® 1 package, this module integrates two series-connected SCRs with a common cathode configuration, delivering precise and reliable control over high currents. It is the go-to solution for developers of controlled rectifiers, AC voltage controllers, and industrial soft starters who prioritize operational robustness and long-term stability over high-frequency switching performance.
Technical Deep Dive: The Foundation of Durability
The long service life and consistent performance of the SKT240/12E are not accidental. They are the result of deliberate design choices focused on withstanding harsh industrial environments.
- Glass Passivated Thyristors: At the core of the SKT240/12E are thyristor chips protected by glass passivation. This process creates a hermetic, inorganic seal around the sensitive silicon junctions. Unlike softer organic materials, this hard glass layer provides superior protection against moisture, contamination, and ion migration, which are primary causes of long-term voltage blocking degradation. This ensures stable performance and extends the module's operational lifetime, even in humid or polluted factory settings.
- Robust Thermal Engineering: The module utilizes a copper baseplate directly bonded to an Aluminum Oxide (Al2O3) ceramic substrate. This construction provides excellent electrical isolation (3000V~) while ensuring an efficient thermal pathway from the silicon die to the heatsink. This superior thermal design is critical for managing heat during high-current operations, preventing thermal runaway and enhancing overall system reliability.
Application Scenarios & Value Proposition
The Semikron SKT240/12E excels where precise, line-frequency power modulation is essential. Its topology is a perfect fit for a range of heavy-duty industrial systems:
- Controlled Bridge Rectifiers: In applications like DC motor drives and battery chargers, the SKT240/12E enables the creation of efficient single-phase or three-phase controlled rectifiers. Its ability to precisely manage the firing angle allows for variable DC output voltage, providing smooth speed and torque control for motors or optimized charging profiles for large battery banks.
- AC Voltage Controllers (AC Choppers): For industrial heating elements, large-scale lighting dimmers, or transformer tap changers, this module can be configured in a back-to-back SCR topology. This setup delivers smooth, continuous control of AC power, improving process efficiency and reducing mechanical stress compared to simple on/off contactors.
- Industrial Motor Soft Starters: By gradually increasing the voltage applied to a three-phase induction motor, the SKT240/12E significantly reduces mechanical shock on gearboxes and conveyors and mitigates the high inrush currents that can destabilize the electrical grid. This extends the lifespan of the entire mechanical drivetrain and reduces peak energy demand charges.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Repetitive Peak Reverse Voltage (VRRM) | 1300 V |
| Repetitive Peak Off-State Voltage (VDRM) | 1300 V |
| Average On-State Current (ITAV @ Tc=85°C) | 240 A |
| RMS On-State Current (ITRMS) | 380 A |
| Surge On-State Current (ITSM, 10ms) | 5500 A |
| Isolation Voltage (Visol, 50Hz, 1 min) | 3000 V |
| Package | SEMIPACK® 1 |
For complete details, please refer to the official SKT240/12E datasheet.
Frequently Asked Questions (FAQ)
- Can this module be used for high-frequency applications?No, the SKT240/12E is a line-commutated thyristor module designed for low-frequency applications (typically 50/60 Hz, up to 400 Hz). For high-frequency switching (kHz range), an IGBT Module would be the appropriate choice.
- What is the primary advantage of the SEMIPACK® 1 package?The SEMIPACK® package is an industry-standard footprint known for its robustness, isolated baseplate, and ease of mounting. It simplifies mechanical design and ensures reliable pressure contact for both electrical and thermal connections, making it ideal for building scalable and maintainable power stacks.
By leveraging proven technology and a ruggedized package, the Semikron SKT240/12E offers a highly dependable and cost-effective solution for your next power control project. If you require assistance in integrating this module into your system or need a customized quote for your application, please contact our technical team for selection support.
