Content last revised on November 15, 2025
PM25RSK120 IPM Module: 1200V 25A Integrated Power Stage
Introduction to the PM25RSK120 Intelligent Power Module
The Mitsubishi Electric PM25RSK120 is a 1200V, 25A Intelligent Power Module (IPM) that accelerates motor drive development by integrating a 7-in-1 IGBT stage with comprehensive protection. With its core specifications of 1200V | 25A | P C 125W, this module delivers two primary engineering benefits: drastically reduced design complexity and enhanced operational reliability. For engineers designing compact servo drives, the PM25RSK120 is an exceptionally suitable choice because its high level of integration consolidates the power stage, gate drive, and protection circuits, minimizing PCB footprint and simplifying the control interface.
FAQ
Answering Key Integration Questions
Success Stories / Deployment Snippets
Deployed for Compact, High-Reliability Motion Control
While specific customer deployments are confidential, modules with the architecture of the Mitsubishi Electric PM25RSK120 are frequently specified in applications where space and development time are critical constraints. A typical use-case involves the development of a multi-axis servo drive system for automated packaging machinery. In this scenario, the PM25RSK120 allows engineers to fit a complete three-phase inverter and brake circuit for each motor axis into a very compact enclosure. The integrated protection and direct MCU interface cut the control board design and validation phase by weeks, enabling the OEM to meet an aggressive product launch schedule. The module's proven reliability in handling rapid acceleration and deceleration cycles contributes to the machinery's long-term operational uptime.
Application Scenarios & Value
Streamlining Designs in AC Servo and Motor Control
The PM25RSK120 is engineered to simplify the power electronics stage in a variety of motion control and power conversion systems. Its all-in-one design provides significant value in applications where reducing size, component count, and assembly complexity are paramount.
- AC Servo Drives & Spindle Drives: The module's 7-in-1 configuration, including the brake circuit, is ideal for the precise control of servo motors in CNC machinery, robotics, and factory automation. Its integrated protection ensures the high reliability required for these demanding tasks.
- General-Purpose Inverters: For small to medium-sized three-phase motor drives (typically up to 3.7 kW), this IPM offers a complete power stage solution that accelerates manufacturing and improves product consistency.
- Uninterruptible Power Supplies (UPS): In smaller commercial UPS systems, the module's robust 1200V rating and integrated nature help create compact and reliable inverter stages for critical power backup.
For systems that require higher current handling but a similar level of integration, the 7MBR50SB120-50 offers a logical pathway for scaling power output while maintaining the benefits of a modular design.
Technical Deep Dive
Inside the Integrated 7-in-1 Power Stage
The Mitsubishi Electric PM25RSK120 is more than a collection of semiconductors; it is a highly integrated power system in a single package. At its core are seven IGBTs and their corresponding freewheeling diodes. Six of these pairs are arranged in a three-phase full-bridge topology for the inverter output (U, V, W phases). The seventh IGBT/diode pair constitutes the brake chopper circuit. What sets this IPM (Intelligent Power Module) apart is the inclusion of dedicated high-voltage integrated circuits (HVICs) and low-voltage integrated circuits (LVICs). These internal control circuits perform several critical functions:
- Optimized Gate Drive: The HVICs provide precisely controlled gate voltage and current to the IGBTs, ensuring efficient and safe switching while minimizing losses. This eliminates the complex task of designing an external, isolated gate drive circuit.
- Integrated Protection: The module actively monitors for fault conditions. It provides short-circuit protection by sensing desaturation, over-current protection, and under-voltage lockout for the control supply to prevent insufficient gate drive voltage, a common cause of IGBT failure.
- Fault Signaling: Upon detecting a fault, the module not only shuts down the affected IGBTs safely but also outputs a fault signal. This feedback allows the system controller to take immediate corrective action, enhancing overall system safety and diagnostics.
Industry Insights & Strategic Advantage
The Strategic Value of Integrated Power Solutions
In the competitive landscape of industrial automation and motor control, time-to-market and long-term reliability are key differentiators. The adoption of integrated solutions like the PM25RSK120 represents a strategic shift away from complex, discrete component designs. By leveraging a pre-engineered, pre-validated power module, design teams can allocate more resources to application-level software and system features rather than low-level power electronics troubleshooting. This modular approach aligns with the industry's move towards platform-based designs, where a core power stage can be quickly adapted for various motor sizes and applications. The inherent reliability of a factory-tested IPM also lowers the total cost of ownership by reducing field failures and associated warranty claims, a critical consideration for industrial equipment manufacturers.
Key Parameter Overview
Core Specifications for Simplified Design
The following parameters are essential for evaluating the PM25RSK120 in your power conversion application. For a complete list of specifications, please download the official product datasheet.
| Parameter | Value | Conditions |
|---|---|---|
| Collector-Emitter Voltage (VCES) | 1200 V | - |
| Collector Current (IC) | 25 A | TC = 25°C |
| Collector Power Dissipation (PC) | 125 W | TC = 25°C, Per IGBT |
| Collector-Emitter Saturation Voltage (VCE(sat)) | 2.7 V (Max) | IC = 25 A, Tj = 125°C |
| Short-Circuit Withstand Time (tsc) | > 10 µs | VCC ≤ 800V, Tj = 125°C |
| Isolation Voltage (Viso) | 2500 Vrms | AC, 1 minute |
Intra-Series Comparison & Positioning
Positioning the PM25RSK120 in the R-Series Lineup
Within Mitsubishi Electric's R-Series of Intelligent Power Modules, the PM25RSK120 is positioned for low-to-mid power applications where a high degree of integration and reliability is essential. It serves as a bridge between lower-power, more compact DIPIPMs™ and larger, higher-current IPMs or discrete IGBT modules. Its 25A current rating makes it a strong fit for 3-phase AC motor control applications in the 2.2 kW to 3.7 kW range (at 400 VAC). For applications demanding lower conduction losses at similar power levels, designers might explore newer generation modules, though this often involves a trade-off in cost or package compatibility. The defining characteristic of the PM25RSK120 is its balanced feature set, offering a complete, protected power stage that simplifies the design of cost-effective and robust industrial drives.
With its integrated brake chopper and comprehensive protection, the PM25RSK120 is the optimal choice for compact motor drives prioritizing design simplicity and operational safety over cutting-edge low VCE(sat) performance.
A Strategic Approach to Power Design
The PM25RSK120 IPM represents a forward-thinking design philosophy, enabling engineering teams to focus on system-level innovation rather than the intricacies of power circuit design. By consolidating critical functionalities into a single, reliable component, this module not only shortens development cycles but also lays the groundwork for more scalable and maintainable product platforms. As industrial systems become increasingly complex and interconnected, leveraging such integrated power solutions will be instrumental in achieving both performance targets and strategic business objectives. For a deeper understanding of the underlying technology, consider exploring the principles of IGBT structure and technology.
