Content last revised on October 24, 2025.
SKM111AR: Robust 100V Power MOSFET Module for Demanding DC Drive and Power Supply Applications
Introduction to the SKM111AR Power Module
An Engineering Overview of its Core Electrical and Thermal Capabilities
The Semikron SKM111AR is a high-current N-Channel Power MOSFET module engineered for robust performance in demanding power conversion systems. It delivers a strategic combination of high current handling and efficient thermal dissipation, featuring core specifications of 100V V(DSS) | 200A I(D) | 8.5 mΩ R(DS)on. Key engineering benefits include exceptional thermal stability due to its isolated copper baseplate and simplified system assembly. This module directly addresses the need for a durable switching component in high-power DC choppers and servo drives where reliable, long-term operation is a primary design criterion. For applications requiring higher voltage blocking, such as those in three-phase industrial systems, the SKM400GAR12T4 offers a 1200V rating.
Key Parameter Overview
Decoding the Specs for Thermal Stability and Switching Performance
The technical specifications of the SKM111AR are tailored for high-current switching applications where efficiency and thermal management are paramount. The following table highlights the key parameters that define its performance envelope. These values are critical for engineers performing loss calculations, thermal modeling, and gate drive design.
| Electrical Characteristics (Tj = 25°C unless otherwise specified) | ||
|---|---|---|
| Parameter | Test Condition | Value |
| Drain-Source Voltage (V(BR)DSS) | VGS = 0, ID = 0.25 mA | 100 V |
| Continuous Drain Current (ID) | - | 200 A |
| Pulsed Drain Current (IDM) | - | 600 A |
| Static Drain-Source On-Resistance (RDS(on)) | VGS = 10 V, ID = 130 A | 7 mΩ (typ), 8.5 mΩ (max) |
| Gate Threshold Voltage (VGS(th)) | VGS = VDS, ID = 1 mA | 2.1 V (min), 4.0 V (max) |
| Thermal and Mechanical Characteristics | ||
| Parameter | Notes | Value |
| Max. Junction Temperature (Tj) | - | 150 °C |
| Isolation Voltage (Visol) | AC, 1 minute | 2500 V |
Disclaimer: The parameters listed above are for reference only. For complete and verified specifications, performance curves, and application notes, please refer to the official manufacturer's documentation.
Download the SKM111AR datasheet for detailed specifications and performance curves.
Application Scenarios & Value
System-Level Benefits in High-Current DC Motor Control and Power Conversion
The SKM111AR is best suited for applications where precise control of high DC currents is essential. Its robust thermal design makes it a reliable choice for systems with demanding operational cycles, such as industrial automation and power infrastructure. What is the primary benefit of its isolated copper baseplate? Simplified thermal design and superior heat dissipation, enabling more compact and reliable systems.
- DC Servo and Robot Drives: In robotic applications, motors undergo constant, rapid changes in speed and direction, leading to significant thermal stress on power components. The SKM111AR's efficient thermal pathway via its copper baseplate ensures stable operating temperatures, which is critical for maintaining the precision and repeatability of the servo drive.
- Switched-Mode Power Supplies (SMPS): For high-power SMPS, minimizing conduction losses is key to achieving high efficiency. The low R(DS)on of 8.5 mΩ (max) directly reduces I²R losses, lowering waste heat and often reducing the size of the required heatsink.
- UPS Equipment: In uninterruptible power supplies, reliability is non-negotiable. The module's industrial-grade construction and high surge current capability (IDM up to 600A) provide the necessary resilience to handle load transients and ensure continuous operation during power disturbances.
- DC Choppers: The module's fast switching characteristics are well-suited for DC-DC converters (choppers) used in applications like battery chargers and DC power regulators, enabling efficient power control.
For systems that require a higher current rating but similar voltage class, designers might also evaluate the 2MBI300HH-120, which provides different performance characteristics.
Technical Deep Dive
The Engineering Impact of the Isolated Copper Baseplate
A defining feature of the Semikron SKM111AR is its isolated copper baseplate. This is not merely a mounting feature but a core element of its thermal management strategy, delivering tangible benefits for system designers. The copper acts as an efficient heat spreader, rapidly drawing thermal energy away from the MOSFET die. The integrated electrical isolation simplifies the mechanical assembly, as multiple modules can be mounted onto a single, non-isolated heatsink without the need for additional insulating pads.
Think of it this way: a standard module without an isolated baseplate is like placing a hot pan on a countertop with a thin, separate trivet. The trivet works, but heat transfer can be uneven. The SKM111AR's design is like having the trivet perfectly and permanently bonded to the bottom of the pan. This creates a seamless, highly efficient path for heat to escape, reducing thermal bottlenecks and lowering the critical junction temperature of the semiconductor. This results in enhanced reliability and a longer operational lifespan, particularly in applications with heavy thermal cycling.
Frequently Asked Questions (FAQ)
How does the 8.5 mΩ maximum R(DS)on impact system design?
A low on-resistance is critical for efficiency. In a high-current application, every milliohm counts. An R(DS)on of 8.5 mΩ ensures that conduction losses (calculated as P = I² * R) are minimized, which reduces the amount of waste heat generated. This directly translates to lower operating temperatures, improved system reliability, and potentially smaller, less costly heatsinking solutions.
What is the significance of the built-in gate resistors mentioned in the features?
The inclusion of internal gate resistors helps to dampen high-frequency oscillations that can occur during the rapid switching of the MOSFET. These oscillations, if not controlled, can lead to increased switching losses, electromagnetic interference (EMI), and even component damage. By integrating these resistors into the module, Semikron simplifies the gate drive circuit design and enhances the module's stability, especially in electrically noisy environments.
To further explore the principles behind power module design, consider this guide on analyzing IGBT and MOSFET modules.
Component Sourcing and Design Support
To facilitate your design and procurement process, we provide access to current technical documentation and component information. Our role is to supply engineers and procurement managers with the precise components required for their system designs. For detailed inquiries regarding the SKM111AR or to request information for your project, please contact our technical sales team for assistance.
