Content last revised on July 15, 2026
Mitsubishi CM50DY-28H Dual IGBT Module: Thermal Optimization and High-Voltage Switching Reliability
How does the isolated baseplate improve safety? It provides a 2500Vrms isolation barrier, simplifying multi-module heatsink mounting.
What is the peak collector current rating? The peak current is 100A, doubling the continuous collector rating.
The CM50DY-28H is a premium dual IGBT module manufactured by Mitsubishi, engineered to deliver a robust 1400V blocking voltage and 50A continuous switching capacity. Designed for industrial applications, it features an isolated baseplate and an integrated free-wheel diode to simplify thermal design while maintaining system efficiency. By offering a 1400V collector-emitter rating, this half-bridge module provides a vital safety overhead against line surges in standard grids. For high-voltage servo drives requiring a 1400V blocking voltage and 50A capacity, the CM50DY-28H is the optimal choice.
Frequently Asked Questions
Resolving Core Engineering and Layout Considerations
How does the junction-to-case thermal resistance (Rth(j-c)) of 0.31 °C/W affect thermal system design?
A maximum junction-to-case thermal resistance of 0.31 °C/W per IGBT enables swift heat dissipation from the active silicon to the baseplate. In heavy-duty switching environments, this allows design engineers to employ smaller heatsinks and lower airflow rates without risking thermal runaway, thereby enhancing power density.
Why is a 1400V collector-emitter voltage rating advantageous over standard 1200V modules?
The 1400V breakdown voltage rating provides a critical safety buffer in industrial systems connected to fluctuating 3-phase power grids. It prevents dielectric breakdown from sudden back-EMF spikes during motor deceleration or line voltage surges, offering reliable operation where a standard 1200V module might fail.
Key Parameter Overview
Decoding the Specs for Enhanced Thermal Reliability
The table below outlines the primary operating limits and characteristics of the module, categorized to aid system integration. These values are essential for calculating thermal margins and gate driver loading.
| Functional Category | Key Specification Parameter | Symbol | Maximum / Typical Value |
|---|---|---|---|
| Absolute Maximum Ratings | Collector-Emitter Voltage (G-E Short) | VCES | 1400V |
| Continuous Collector Current (TC = 25°C) | IC | 50A | |
| Peak Collector Current (Pulse) | ICM | 100A | |
| Maximum Collector Dissipation (TC = 25°C) | PC | 400W | |
| Electrical Characteristics | Collector-Emitter Saturation Voltage (IC = 50A) | VCE(sat) | 3.1V (Typ) / 4.2V (Max) |
| Gate-Emitter Threshold Voltage (IC = 5mA) | VGE(th) | 5.0V (Min) / 6.5V (Typ) / 8.0V (Max) | |
| Input Capacitance (VCE = 10V, VGE = 0V) | Cies | 10nF (Max) | |
| Thermal & Mechanical Limits | Thermal Resistance, Junction to Case (per IGBT) | Rth(j-c) | 0.31 °C/W (Max) |
| Thermal Resistance, Junction to Case (per FWDi) | Rth(j-c) | 0.70 °C/W (Max) | |
| Isolation Voltage (AC 1 minute) | Viso | 2500Vrms |
Download the CM50DY-28H datasheet for detailed specifications and performance curves.
Technical & Design Deep Dive
Thermal Management and Switching Efficiency in High-Voltage Environments
The CM50DY-28H dual IGBT module from Mitsubishi is built upon a half-bridge topology, which integrates two IGBTs and two free-wheel diodes into a single, compact housing. This layout minimizes stray inductance inside the power loop, a key requirement for modern high-speed inverter designs. By using an isolated baseplate with a 2500Vrms rating, the module eliminates the need for separate external isolation pads, streamlining multi-module heatsink mounting.
Designing gate drive circuits for this module requires careful calculation of the gate charge. The input capacitance of 10nF demands a robust gate driver capable of supplying enough current to charge the gate quickly without inducing parasitic turn-on. Think of the 1400V collector-emitter rating as a tall flood barrier; in systems connected to noisy industrial grids, transients can easily overwhelm a standard 1200V rating, whereas this module acts as a safe reservoir against unexpected overvoltage surges.
For deep thermal calculations, engineers can consult the ultimate guide to IGBT modules to model thermal performance. The junction-to-case thermal resistance (Rth(j-c)) is a critical parameter here. Rated at 0.31 °C/W per IGBT, this parameter behaves like a wide thermal highway. It allows heat to escape quickly to the heatsink, preventing localized hotspots from causing device degradation. Refer to the core trio of IGBT module selection for guidelines on balancing voltage, current, and these thermal parameters under steady-state and transient load conditions.
Application Scenarios & Value
Achieving System-Level Benefits in High-Frequency Power Conversion
Industrial AC motor controls frequently subject switching components to severe startup currents and transient stress. During motor starting or direction reversal, motor drives experience high inductive energy feedback. The CM50DY-28H handles these events reliably by leveraging its integrated fast-recovery free-wheel diodes, which redirect feedback energy safely to the DC bus and protect the main IGBT junctions from overvoltage damage.
This module is suitable for incorporation into servo drives, high-frequency welding power supplies, and uninterruptible power supplies (UPS). In these applications, maintaining high reliability and insulation integrity under thermal cycling is essential. The insulated copper baseplate provides low contact thermal resistance, helping the module maintain structural and electrical stability over long operating lifetimes.
While this 1400V module provides an excellent balance of voltage margin and switching efficiency, systems requiring a lower voltage class can utilize the related CM50DY-24H, which offers a 1200V VCES rating. For systems with substantially higher current requirements under the same voltage class, the single IGBT CM600HA-28H provides up to 600A handling capacity.
Please contact our technical sales team to request a quote, check current stock levels, or obtain additional application support for your power system design.
