SKD62/16: A Robust Three-Phase Bridge Rectifier for Demanding Industrial Power Systems
Content last revised on October 7, 2025.
Engineered for High Reliability in Industrial Rectification
Delivering Stable DC Power with Superior Thermal and Electrical Margins
The SKD62/16 is a high-reliability three-phase bridge rectifier module engineered for robust performance in demanding power conversion applications. It delivers a formidable combination of high voltage and current ratings within a ruggedized, industry-standard package: 1600V | 86A | 500A IFSM. Key engineering benefits include exceptional resilience to line voltage transients and superior thermal efficiency for enhanced system longevity. This module directly addresses the need for a dependable, easy-to-mount rectification solution in industrial power supplies and motor control systems. For industrial drives and power supplies operating on 400V or 480V lines, the SKD62/16's 1600V repetitive peak reverse voltage provides a critical safety margin, making it the best-fit choice for systems where reliability is paramount.
Application Scenarios & Value
System-Level Benefits in Industrial Power Conversion
The SKD62/16 is designed for core power conversion tasks where three-phase AC is converted to DC power. Its primary value is in its robustness, making it a cornerstone for reliability in harsh electrical environments.
- Input Rectifiers for Variable Frequency Drives (VFDs): In VFDs, the SKD62/16 provides the initial AC-to-DC conversion, creating the stable DC bus that powers the inverter stage. A key engineering challenge in these systems is handling voltage spikes from the industrial grid. The SKD62/16's 1600V repetitive peak reverse voltage (VRRM) rating provides a substantial safety margin, protecting downstream components from transient overvoltage events and reducing system field failures.
- Industrial Power Supplies: For high-power DC supplies, this module offers a simple, mechanically secure solution for rectification. Its high surge current capability (IFSM) of 500A ensures it can withstand the inrush currents typical of large capacitor banks charging at startup.
- DC Motor Field Supplies & Battery Chargers: The module delivers the consistent DC power required for exciting DC motor fields or for bulk charging industrial battery systems. Its thermally efficient design, featuring a large, isolated baseplate, simplifies heatsink requirements and ensures stable operation under continuous load. What is the primary benefit of its robust plastic case? It ensures high electrical isolation and mechanical stability for easy and secure chassis mounting.
While the SKD62/16 is well-suited for a wide range of applications, for systems demanding higher current output, the related SKD100/16 offers similar voltage characteristics with an increased current handling capacity.
Key Parameter Overview
Decoding the Specifications for Robust System Design
The technical specifications of the SKD62/16 are foundational to its performance in industrial applications. The parameters below have been selected to provide engineers with the critical data needed for system integration and reliability assessment. Each value is derived from the official component datasheet, ensuring accuracy for design and simulation.
| Electrical Characteristics (at Tc = 85 °C unless otherwise specified) | |
|---|---|
| Repetitive Peak Reverse Voltage (VRRM) | 1600 V |
| Average Forward Current (ID) | 86 A |
| Forward Surge Current (IFSM), Tvj = 25 °C, 10 ms | 500 A |
| Thermal and Mechanical Specifications | |
| Operating Junction Temperature (Tvj) | -40 to +150 °C |
| Isolation Voltage (Visol), a.c. 50 Hz; r.m.s.; 1 min | 3000 V |
| Thermal Resistance, Junction to Case (Rth(j-c)), total | 0.25 K/W |
| Case / Package | G 36 / SEMIPACK 1 |
This data is for reference only. For detailed specifications, characteristic curves, and application notes, please refer to the official manufacturer's documentation.
Download the SKD62/16 datasheet for detailed specifications and performance curves.
Frequently Asked Questions (FAQ)
How does the 1600V VRRM rating of the SKD62/16 benefit designs for 480V AC systems?
The high VRRM provides a significant safety margin against voltage transients commonly found on industrial power lines. For a 480V RMS system, the peak line-to-line voltage is approximately 679V. The 1600V rating offers more than double this peak voltage, ensuring the rectifier does not fail during line surges, which enhances the overall reliability and longevity of the power supply or motor drive.
What is the significance of the SEMIPACK 1 package and its isolated baseplate?
The SEMIPACK 1 is an industry-standard power module housing known for its robustness and ease of mounting. The key benefit is its electrically isolated baseplate, which simplifies thermal management. It allows multiple modules to be mounted onto a single, non-isolated heatsink without the need for additional insulating materials. This reduces assembly complexity, lowers parts count, and improves the thermal transfer from the module to the heatsink, as detailed by leading manufacturers like Semikron Danfoss.
Design & Integration Considerations
Ensuring Optimal Performance and Longevity
Proper integration of the SKD62/16 is critical to leveraging its full capabilities. The primary consideration is thermal management. The module's total thermal resistance from junction to case (Rth(j-c)) is rated at 0.25 K/W. This value is the cornerstone of heatsink calculation. To maintain the junction temperature (Tvj) below the 150 °C maximum, engineers must select a heatsink with a sufficiently low thermal resistance (Rth(s-a)) to dissipate the heat generated during operation, which can be calculated based on the expected average forward current and forward voltage drop. Using a quality thermal interface material (TIM) between the module's baseplate and the heatsink is non-negotiable for minimizing contact thermal resistance and achieving reliable performance.
Strategic Component Selection
For engineering teams developing industrial-grade power electronics, the SKD62/16 represents a strategic choice focused on long-term reliability over minimal upfront cost. Its robust electrical margins and proven package design contribute to a lower total cost of ownership by reducing field failures and maintenance requirements in applications such as Variable Frequency Drive (VFD) systems and uninterruptible power supplies. Integrating this UL-recognized component can also streamline the certification process for the end equipment, providing a smoother path to market.
