Content last revised on February 20, 2026
RM500UZ-24 Mitsubishi High Power Diode Module: Robust Rectification for 2400V Industrial Systems
The RM500UZ-24, manufactured by Mitsubishi Electric, is a high-capacity general-purpose diode module designed for heavy-duty industrial rectification. For engineers prioritizing voltage headroom and thermal durability, this module provides a 2400V repetitive peak reverse voltage and a 500A average forward current rating. It is specifically engineered to handle the rigorous demands of high-voltage power supplies where long-term reliability is non-negotiable.
What is the primary benefit of the RM500UZ-24 surge current handling? Its massive 10,000A non-repetitive surge rating protects the system during transient overload events. For heavy-duty rectifiers requiring a 2400V blocking margin, the RM500UZ-24 500A module is the optimal choice for thermal stability.
Key Parameter Overview
Functional Specifications for High-Voltage Power Conversion
The following technical data highlights the RM500UZ-24's capacity to operate in high-stress environments. Detailed performance curves and safe operating areas are essential for precise thermal modeling.
| Technical Specification | Rating / Value | Engineering Context |
|---|---|---|
| Repetitive Peak Reverse Voltage (Vrrm) | 2400V | Ensures safe operation in 690V AC line systems. |
| Average Forward Current (If(av)) | 500A | Rated at a case temperature (Tc) of 100°C. |
| Surge Forward Current (Ifsm) | 10,000A | Critical for 60Hz half-cycle non-repetitive protection. |
| Thermal Resistance (Rth(j-c)) | 0.08°C/W | Minimizes junction-to-case temperature rise. |
| Insulation Voltage (Viso) | 2500V | Standard AC 1-minute isolation for safety compliance. |
Download the RM500UZ-24 datasheet for detailed specifications and performance curves.
Application Scenarios & Value
Ensuring Rectification Integrity in Harsh Industrial Grids
Engineers often face the challenge of managing high-current rectification in environments prone to voltage spikes. The RM500UZ-24 addresses this by offering a significant voltage buffer. In traction power systems or heavy industrial DC drives, the 2400V rating acts as a safety shield, preventing catastrophic failure from line transients that might overwhelm a standard 1600V or 1700V diode.
Consider an industrial conveyor system utilizing a Variable Frequency Drive (VFD) with a large input rectifier stage. During motor startup or sudden braking, the surge current can be immense. The RM500UZ-24's 10,000A Ifsm rating is comparable to a "structural dam," absorbing massive kinetic electrical energy without degrading the silicon junction. This ruggedness is vital for systems adhering to IEC 60146-1-1 standards for semiconductor converters.
For designs requiring different current densities, the SKKD162/16 provides a more compact solution for lower power tiers, while the MDS500A/1600V serves systems where a three-phase bridge configuration is preferred over discrete modules.
Industry Insights & Strategic Advantage
Strategic Thermal Management for Long-Cycle Reliability
In the evolving landscape of industrial 4.0, power density is often prioritized, but for 24/7 heavy industry, thermal reliability remains the superior metric. The RM500UZ-24 features a Thermal Resistance (Rth(j-c)) of only 0.08°C/W. To put this in perspective, think of the thermal resistance as a highway for heat; a lower value means a wider, faster road, allowing heat to escape the semiconductor die toward the heatsink with minimal bottlenecking.
By keeping the junction temperature (Tj) low, engineers can significantly extend the power cycling capability of the module. This is particularly relevant in welding power supplies and electrochemical plating rectifiers, where the load is constantly pulsed. Strategically choosing a module with a 2400V rating also reduces the need for complex snubber circuits, as the device can inherently withstand higher peak voltages. You may explore further insights on IGBT and Diode analysis to understand how these components interact in modern reliable power architectures.
FAQ
How does the 2400V rating of the RM500UZ-24 impact safety margins in a 600V AC system?
In a 600V AC system, the peak voltage is approximately 848V. Using a 2400V module provides a nearly 3x safety margin, which is essential for surviving the inductive spikes and line surges common in heavy industrial grids without the need for excessive external protection.
Does the RM500UZ-24 require specific mounting torque for its UZ package?
Yes, maintaining the correct mounting torque is critical for achieving the rated 0.08°C/W thermal resistance. Insufficient torque creates air gaps that act as thermal insulators, while excessive torque can stress the internal ceramic isolation. Always refer to the Thermal Management guidelines provided by the manufacturer for mounting specifications.
Our technical team is available to provide data verification and logistics support for your high-power rectification projects. Contact us today to discuss your RM500UZ-24 requirements or to request a quote for your scheduled production runs.
