Content last revised on February 10, 2026
RM500HA-2H: A Robust 1600V, 500A Diode Module for High-Power Rectification
The Mitsubishi RM500HA-2H is a high-power diode module engineered for reliability and performance in demanding power conversion systems. With core specifications of 1600V, 500A, and an excellent thermal resistance of 0.06 K/W, this device provides a durable solution for power rectification. Key benefits include high voltage blocking capability and superior thermal performance, ensuring operational stability under heavy loads. What is its peak voltage rating? The module provides a repetitive peak reverse voltage of 1600V. It is the optimal choice for demanding DC power supplies and motor control front-ends requiring high surge current immunity.
Application Scenarios & Value
Delivering Robust Rectification in Industrial Power Systems
The RM500HA-2H is engineered for high-power rectification roles, such as the front-end of AC motor controllers, welding power supplies, and battery charging systems. In these applications, the ability to withstand high inrush and fault currents is critical. The module’s impressive 10,000A surge forward current rating (IFSM) provides an essential safety margin, protecting the system during unexpected load conditions like motor stalls or short circuits. This high surge capability ensures operational continuity and prevents catastrophic failures in industrial environments.
Its high repetitive peak reverse voltage of 1600V makes the RM500HA-2H a solid choice for systems connected to high-voltage DC buses, offering substantial headroom and enhancing long-term reliability. It is important for system designers to note that this series is a well-established design; for new developments, consulting the latest product families is advisable to ensure access to the most current technologies. For systems requiring a dual-diode configuration at a different power scale, the SKKD162/16 offers a different set of specifications for consideration.
Key Parameter Overview
Functional Ratings for Power System Design
The technical specifications of the RM500HA-2H are optimized for high-power applications. The following table groups key parameters by their function, providing a clear overview for design and evaluation purposes.
| Parameter | Symbol | Value | Conditions |
|---|---|---|---|
| Absolute Maximum Ratings | |||
| Repetitive Peak Reverse Voltage | VRRM | 1600V | - |
| Average Forward Current | IF(AV) | 500A | Single-phase, half-wave, Tc=90°C |
| Surge (Non-repetitive) Forward Current | IFSM | 10000A | One half cycle at 60Hz, peak value |
| I²t for Fusing | I²t | 4.2 × 10⁵ A²s | Value for one cycle |
| Operating Junction Temperature | Tj | -40 to +150°C | - |
| Thermal and Electrical Characteristics | |||
| Repetitive Peak Reverse Current | IRRM | 50mA (Max) | Tj=150°C, VRRM applied |
| Thermal Resistance (Junction to Case) | Rth(j-c) | 0.06 K/W (Max) | Per 1/2 module |
| Isolation Voltage | Visol | 2500V | AC, 1 minute |
For a complete understanding of its performance characteristics, including detailed graphs and application notes, please Download the RM500HA-2H datasheet for detailed specifications and performance curves.
Technical Deep Dive
The Critical Role of Thermal Resistance in High-Current Applications
A key parameter defining the reliability of a high-power diode like the RM500HA-2H is its thermal resistance. With a maximum junction-to-case thermal resistance (Rth(j-c)) of just 0.06 K/W, this module demonstrates highly efficient heat transfer. Think of thermal resistance as the narrowness of a pipe for heat; the RM500HA-2H's low value is like having a very wide pipe, allowing waste heat generated during conduction to escape the semiconductor junction quickly and efficiently. This characteristic is fundamental to maintaining a lower operating junction temperature, which directly correlates to a longer operational lifespan and higher system reliability. For engineers, this enables more compact heatsink designs or higher power throughput in a given thermal envelope, a core aspect of effective thermal management.
Furthermore, the module's high I²t rating of 4.2 x 10⁵ A²s is a measure of its robustness against surge events. This can be compared to a fuse's ability to absorb a specific amount of energy before failing. A high I²t value signifies that the diode can withstand significant, non-repetitive current surges without degradation, a critical factor for system survivability in applications prone to faults or high inrush currents.
Frequently Asked Questions
What is the engineering significance of the 10,000A surge current rating (IFSM) on the RM500HA-2H?
The 10,000A surge rating is a critical reliability feature. It ensures the module can survive massive, brief current spikes that occur during events like motor startup, capacitor inrush, or downstream short-circuits without failing. This robustness is essential for building resilient power systems in demanding industrial environments.
How does the low thermal resistance (Rth(j-c)) of 0.06 K/W influence system design and reliability?
A low Rth(j-c) allows heat to be extracted from the diode junction more effectively. This results in a lower operating temperature under load, which significantly enhances the module's long-term reliability and lifespan. For designers, it can mean using a smaller, more cost-effective heatsink or pushing the system to higher power levels while staying within safe thermal limits.
To further explore component reliability and failure analysis, a visit to the Field Engineer's Handbook can provide valuable insights. For inquiries regarding the RM500HA-2H or to discuss your specific application needs, please contact our technical sales team for assistance.
