The Mitsubishi CM50MXB2-24A and CM35MXB2-24A are both insulated-gate bipolar transistor (IGBT) modules commonly used in high-power switching applications, such as inverters, servo amplifiers, and power converters.
1. Current and Voltage Ratings
- CM50MXB2-24A: This model is rated for a collector current (I_C) of 50A and a collector-emitter voltage (V_CES) of 1200V. These values make it suitable for more demanding applications where higher current handling is required.
- CM35MXB2-24A: On the other hand, this module is designed to handle a lower current of 35A, with the same collector-emitter voltage of 1200V. The lower current capacity suggests it is better suited for applications where energy efficiency is important but the current demand is lower.
The main difference here is the current handling capability, where the CM50MXB2-24A is clearly the more powerful option, supporting up to 50A, while the CM35MXB2-24A is more appropriate for lower-power requirements, supporting 35A.
2. Power Dissipation
- CM50MXB2-24A: With higher current ratings comes greater power dissipation, which means this module needs a more robust cooling system. Power dissipation affects the module’s efficiency and the design of the cooling system for the overall equipment.
- CM35MXB2-24A: This module, due to its lower current handling, will dissipate less power and may require less intensive cooling, which could reduce the overall cost of the system.
3. Applications and Use Cases
- CM50MXB2-24A: This module is ideal for use in industrial applications where high power is required, such as large motor drives, power inverters, or solar inverters. It is particularly suited for high-load applications due to its 50A rating, which gives it a greater capacity to handle higher current and power levels.
- CM35MXB2-24A: This model is better suited for mid-range applications where lower current levels are sufficient. It is typically used in situations where efficiency is prioritized over raw power, such as smaller servo drives or light industrial machines.
4. Thermal Management
Both modules come with insulated baseplates, which aid in thermal management, providing electrical insulation between the module and the heatsink while maintaining good thermal conductivity. However, the CM50MXB2-24A, due to its higher current rating, will typically require a more robust thermal management system to dissipate the additional heat generated during operation.
5. Price and Availability
- CM50MXB2-24A: This module is generally more expensive than the CM35MXB2-24A due to its higher power rating and the components required to handle higher currents. Prices range from to 8 per unit depending on the supplier and quantity ordered.
- CM35MXB2-24A: Being a lower-powered module, the CM35MXB2-24A is more affordable, making it a cost-effective choice for applications that don’t require high current handling.
6. Physical Design
Both modules are designed in a similar package style, making them easy to integrate into existing designs with minimal modifications. However, due to the higher current rating, the CM50MXB2-24A may require thicker cables and a larger cooling setup, which could increase the overall space requirements in some installations.
7. Efficiency and Performance
While both modules are designed to offer high efficiency, the CM50MXB2-24A provides a performance edge in applications that demand higher power. However, if the current requirements are within the capacity of the CM35MXB2-24A, this module may be more efficient due to lower power losses at lower currents.
Conclusion: Which Should You Choose?
- For high-power applications, such as industrial motor drives, heavy-duty inverters, or large solar power systems, the CM50MXB2-24A is the clear winner due to its ability to handle higher currents (up to 50A) and its robust thermal management requirements.
- For mid-range applications, where efficiency is a higher priority and current demands are lower, the CM35MXB2-24A is a more cost-effective and efficient choice, handling up to 35A.
The key decision factor is the current handling requirement of your specific application. If your system demands more than 35A, the CM50MXB2-24A is the better choice, but for applications under this threshold, the CM35MXB2-24A can save costs while still delivering high performance.
