Content last revised on November 22, 2025
SKR 130/12: High-Reliability Stud-Mount Rectifier Diode
Engineered for Durability in High-Power Industrial Systems
The SKR 130/12 is a robust rectifier diode designed for exceptional reliability and thermal efficiency in demanding industrial power conversion systems. With core specifications of 1200V | 130A | Tvj max 180°C, it delivers dependable performance backed by a ruggedized construction. Key engineering benefits include superior thermal transfer via its stud-mount design and long-term operational stability from its hermetically sealed metal and glass case. This construction directly addresses the engineering need for components that can withstand harsh factory floor conditions without degradation. For industrial power supplies requiring robust rectification against high-voltage line disturbances, the 1200V rating of the SKR 130/12 provides a critical safety margin.
Application Scenarios & Value
System-Level Benefits in Industrial Rectification and Charging Circuits
The SKR 130/12 is optimized for uncontrolled and half-controlled rectifier circuits, serving as a foundational component in the input stages of various power systems. Its high current handling and voltage ratings make it a prime candidate for applications where reliability is non-negotiable.
A high-fidelity engineering scenario for this device is the front-end rectifier for a Variable Frequency Drive (VFD). In such an application, the diode must not only handle the continuous load current but also withstand significant inrush currents during motor startup. The SKR 130/12's peak non-repetitive forward surge current (IFSM) of 2.5 kA ensures it can manage these transient events without failure, contributing directly to the drive's overall robustness. Furthermore, its hermetic metal case with a glass insulator provides superior protection against humidity and airborne contaminants common in industrial settings, a significant advantage over plastic-encapsulated alternatives. This physical resilience ensures stable electrical characteristics over a long operational lifespan. For systems that require a pre-configured dual-diode topology, the SKKD162/16 offers an integrated solution in a single module.
Key Parameter Overview
Decoding the Electrical and Thermal Specifications for Robust Design
The technical specifications of the SKR 130/12 are tailored for high-power industrial applications where both electrical performance and thermal management are critical design considerations. Understanding these parameters is key to leveraging the device's full potential.
| Parameter | Value | Significance |
|---|---|---|
| Electrical Characteristics | ||
| Repetitive Peak Reverse Voltage (VRRM) | 1200 V | Provides substantial margin for operation on 400V/480V industrial AC lines. |
| Average Forward Current (IFAV) | 130 A (at Tc = 125°C) | Enables high continuous power throughput in demanding rectifier applications. |
| Peak Non-Repetitive Surge Current (IFSM) | 2.5 kA (at 10 ms, Tvj = 25°C) | Ensures survivability during system-level fault conditions or high inrush currents. |
| Maximum Forward Voltage Drop (VF) | 1.5 V (at IF = 500 A) | A key factor in calculating conduction losses and overall system efficiency. |
| Thermal & Mechanical Characteristics | ||
| Operating Junction Temperature (Tvj) | -40 to +180 °C | Wide operating range supports use in extreme temperature environments. |
| Thermal Resistance, Junction-to-Case (Rth(j-c)) | 0.35 K/W | Indicates efficient heat transfer from the silicon die to the case. |
| Mounting | M12 Threaded Stud | Facilitates a secure, low-resistance thermal path to the heatsink. |
| Case Type | E14 (DO-205AC) | Industry-standard hermetically sealed metal housing for high reliability. |
Download the SKR 130/12 datasheet for detailed specifications and performance curves.
Technical Deep Dive
A Closer Analysis of the Hermetic Seal and Stud-Mount Thermal Path
Two core design features elevate the SKR 130/12's reliability profile: its hermetic sealing and its stud-mount thermal design. The hermetic metal case with a glass insulator creates an impermeable barrier, protecting the internal silicon junction from moisture, dust, and corrosive gases. This is a critical distinction from non-hermetic, plastic-molded packages, which can be susceptible to environmental degradation over many years of service. What is the primary benefit of its hermetic design? Enhanced long-term reliability and stable performance by preventing environmental contamination.
The M12 stud design is central to the device's thermal management strategy. It acts as a highly effective thermal conduit, providing a direct, low-resistance path for heat to flow from the diode's case to the heatsink. This efficiency is reflected in its thermal resistance value. Interpreting thermal resistance (Rth) can be analogized to fluid dynamics; it is like the friction inside a pipe. A low Rth(j-c) value of 0.35 K/W means the "pipe" carrying heat from the junction to the case is very wide, allowing heat to escape easily and keeping the critical silicon junction cooler. This robust thermal design is fundamental to achieving the high 130A current rating and ensuring a long operational life under heavy loads.
Frequently Asked Questions (FAQ)
What is the primary advantage of the SKR 130/12's stud-mount design over other package types?
The stud-mount configuration provides both a secure mechanical connection and a highly efficient thermal path. The large contact area and clamping force of the M12 stud ensure minimal thermal resistance to the heatsink, which is critical for dissipating heat effectively at high currents and achieving the specified performance.
How does the hermetic metal and glass construction impact the long-term reliability of the SKR 130/12?
The hermetic seal protects the semiconductor element from environmental factors like humidity and pollutants that can cause electrical parameters to drift or lead to premature failure over time. This makes it exceptionally reliable for systems deployed in harsh industrial environments, such as factory floors or outdoor enclosures, where long service life is expected.
Can the SKR 130/12 be used as a freewheeling diode?
Yes, the manufacturer lists "free-wheeling diodes" as one of the typical applications. Its high current and surge ratings make it suitable for this purpose in various power electronic circuits, where it provides a path for inductive load current when the main switch is turned off. For an in-depth exploration of diode technologies, refer to resources from leading manufacturers like Semikron.
For detailed application guidance or to explore how the robust design of the SKR 130/12 can enhance your system's power stage, our technical support team is available for consultation.
