Content last revised on February 26, 2026
CM800DZB-34N: A High-Current 1700V Dual IGBT Module for Demanding Power Systems
Engineered for High-Power Conversion and System Reliability
The Mitsubishi CM800DZB-34N is a high-power dual IGBT module designed for robust performance in demanding power conversion systems. It integrates two IGBT elements in a single package, delivering a formidable 1700V collector-emitter voltage and an 800A continuous collector current. This combination of high voltage and current handling makes it a strategic component for engineers developing high-reliability converters, inverters, and choppers. Featuring Mitsubishi's CSTBT™ (Carrier Stored Trench-gate Bipolar Transistor) technology and an AlSiC baseplate for enhanced thermal management, the module is optimized for both electrical efficiency and long-term operational stability. For systems requiring even greater current capacity in a similar voltage class, the CM1200DB-34N offers an increased rating of 1200A.
What is the primary benefit of the CM800DZB-34N's dual-element design? It enables more compact and simplified layouts for chopper or half-bridge inverter topologies.
Key Parameter Overview
Decoding the Specs for High-Current Applications
The technical specifications of the CM800DZB-34N are critical for system designers aiming to maximize performance and reliability. The module's parameters reflect its capacity to handle substantial electrical and thermal loads. A standout feature is the 1700V collector-emitter voltage (Vces), which provides a significant safety margin for applications running on 690V AC lines, a common standard in heavy industrial equipment. The high continuous DC collector current of 800A (at Tc=80°C) allows for the design of high-output power stages without the immediate need for complex paralleling of multiple devices. This simplifies the busbar layout and gate drive circuitry, contributing to a more robust and cost-effective system design. For a detailed breakdown of performance curves and application notes, it's essential to consult the official documentation.
| Electrical Characteristics (IGBT) | |
| Collector-Emitter Voltage (Vces) | 1700V |
| Collector Current (Ic) at Tc=80°C | 800A |
| Collector-Emitter Saturation Voltage (VCE(sat)) at Ic=800A, Tj=125°C | 2.7V (Typ) |
| Total Gate Charge (Qg) | 4.6µC (Typ) |
| Thermal & Mechanical Characteristics | |
| Junction Temperature (Tj) | -40 to +150°C |
| Thermal Resistance, Junction to Case (Rth(j-c)Q) | 0.024 K/W |
| Baseplate Material | AlSiC |
Download the CM800DZB-34N datasheet for detailed specifications and performance curves.
Application Scenarios & Value
Achieving Robust Performance in Traction Drives and High-Power Inverters
With its combination of high voltage and current ratings, the Mitsubishi CM800DZB-34N is engineered for applications where power density and reliability are paramount. For developers of Variable Frequency Drives (VFDs) used in heavy industry, such as those controlling large motors in mining or manufacturing, this module's 800A capacity is a significant asset. It allows the inverter to handle high starting currents and dynamic loads without stressing the power components. Best fit for high-power 690V industrial inverters, the CM800DZB-34N's 1700V rating offers the necessary design margin for robust performance.
A key engineering challenge in these systems is managing thermal performance under continuous high load. The module's AlSiC baseplate is central to its value proposition. Aluminum Silicon Carbide (AlSiC) has a coefficient of thermal expansion (CTE) that is much closer to that of the ceramic substrate than traditional copper. This minimizes mechanical stress during temperature fluctuations, a common occurrence in applications like wind turbine converters or traction drives that experience frequent start/stop cycles. The reduced stress translates directly into improved power cycling capability and a longer operational lifespan. This makes the CM800DZB-34N a strong candidate for systems where maintenance is difficult and long-term reliability is a primary design goal.
Frequently Asked Questions (FAQ)
How does the AlSiC baseplate in the CM800DZB-34N improve reliability compared to copper?
The AlSiC baseplate has a thermal expansion coefficient that closely matches the ceramic substrate inside the module. This reduces mechanical stress during the thermal cycles of operation, mitigating solder fatigue and delamination—key failure modes in high-power modules. This leads to enhanced long-term reliability and power cycling capability, particularly in applications with fluctuating loads like motor drives.
What is the significance of the 1700V Vces rating for system design?
A 1700V rating provides a crucial safety margin for inverters operating on a 690V AC industrial power grid. It ensures the device can withstand voltage spikes and overshoots that commonly occur during switching operations, especially in inductive load environments like large motor drives or traction systems. This robustness is critical for preventing catastrophic failures and ensuring the longevity of the power conversion system. For more information on IGBT selection based on voltage, see our guide on the core trio of IGBT module selection.
To further assess the suitability of the CM800DZB-34N for your specific power system architecture or to inquire about procurement for your next project, please contact our technical sales team for a detailed consultation.
