Whitepaper: Advancing Power Efficiency with SiC Merged-PiN Schottky (MPS) Diodes
31 March 2026 
Perry Schugart, CMO & Head of Business Development, RIR Power
Executive Summary
The rapid electrification of transportation, renewable energy systems, data centers, and industrial power infrastructure is driving unprecedented demand for power semiconductors that deliver higher efficiency, higher power density, and superior reliability. Silicon Carbide (SiC) technology has emerged as a cornerstone of this transformation, offering dramatic improvements over traditional silicon devices.
Within the SiC diode family, Merged-PiN Schottky (MPS) diodes represent a critical evolution beyond conventional SiC Schottky Barrier Diodes (SBDs). By intelligently combining Schottky and PiN diode structures in a single, monolithic device, SiC MPS diodes overcome the historical trade-offs between low conduction loss, high blocking capability, and ruggedness.
RIR Power Electronics Limited, leveraging over 55 years of high-power semiconductor expertise and its global Si and SiC development capabilities, is introducing SiC MPS diodes designed to meet the demanding requirements of next-generation EVs, renewable energy systems, industrial drives, aerospace, and green hydrogen infrastructure.
RIR’s Leadership in SiC Power Devices RIR is uniquely positioned as India’s only company with existing high-power semiconductor fabrication capability, backed by proven experience in devices rated up to 20,000V and 12,000A. Through its U.S. development operations and its forthcoming first-of-its-kind SiC manufacturing facility in Odisha, RIR is building a vertically integrated SiC ecosystem spanning wafer processing, device design, packaging, and application support.
This foundation enables RIR to deliver high-voltage, high-reliability SiC MOSFETs and diodes, optimized not only for electrical performance, but also for manufacturability, long-term reliability, and system-level value.
Understanding SiC Schottky and Merged-PiN Schottky Diodes
Conventional SiC Schottky Barrier Diodes (SBDs) SiC Schottky diodes are majority-carrier devices that offer:
Near-zero reverse recovery charge (Qrr)
Extremely fast switching
Low switching losses
However, at higher voltages and temperatures, traditional SiC Schottky diodes face inherent limitations:
Increased leakage current
Reduced surge current capability
Higher sensitivity to overload and short-term fault conditions
These factors can constrain their robustness in demanding applications such as traction inverters, grid-connected converters, and industrial power supplies.
SiC Merged-PiN Schottky (MPS) Diodes
The Merged-PiN Schottky (MPS) structure integrates a PiN diode region within the Schottky architecture. Under normal forward operation, the device behaves like a Schottky diode, maintaining low forward voltage and fast switching. Under high current or high voltage stress (surge current), the PiN regions become active, dramatically enhancing device ruggedness.
This intelligent self-adapting behavior allows MPS diodes to deliver the best attributes of both Schottky and PiN devices—without their traditional drawbacks.
Key Performance Advantages of SiC MPS vs. SiC Schottky Diodes
One of the key advantages of SiC MPS diodes is in the forward conduction loss curve, RIR Power’s SiC MPS diodes closely match SiC Schottky diodes at low to nominal current, maintaining low forward voltage and high efficiency during normal operation. At higher current and overload conditions, MPS diodes exhibit lower incremental conduction loss as the embedded PiN regions conduct, stabilizing forward voltage and reducing thermal stress compared to conventional SiC Schottky diodes.
- Superior Surge Current Capability MPS diodes can safely conduct significantly higher surge currents due to the activation of PiN regions during overload events. This makes them far more robust in real-world systems exposed to inrush currents, short circuits, and grid disturbances.
- Lower Leakage at High Temperature While standard SiC Schottky diodes experience rapidly increasing leakage current as junction temperature rises, MPS structures suppress leakage through their PiN regions—enabling stable operation at elevated temperatures.
- Improved Avalanche and Blocking Robustness The merged structure enhances highvoltage blocking stability and avalanche capability, making MPS diodes better suited for high-voltage DC-link and gridtied applications.
- Near-Zero Reverse Recovery Performance Like Schottky diodes, SiC MPS diodes remain majority-carrier devices during normal operation, preserving ultra-fast switching and negligible reverse recovery losses—critical for high-frequency power conversion.
- By combining efficiency with fault tolerance, MPS diodes reduce the need for over-design, snubber circuits, and excessive derating, improving overall system reliability and lowering total cost of ownership
Application Impact
RIR’s SiC MPS diodes enable higher system efficiency and reliability across demanding applications by combining Schottky-like switching performance with enhanced surge, thermal, and high-voltage robustness. This makes them ideally suited for EV traction inverters, renewable energy systems, industrial drives, aerospace, and green hydrogen applications where high-power density, efficiency, ruggedness, and thermal performance are equally critical:
Electric Vehicles (EVs & HEVs)
Traction inverters, onboard chargers, and DC-DC converters benefit from reduced losses, higher efficiency, and improved fault tolerance
Data Centers & AI Infrastructure
High-efficiency UPS, PDU, and server power systems benefit through reduced switching losses, higher power density, and enhanced reliability under continuous high-load operation—critical for hyperscale, edge, and AI-driven data centers with stringent uptime and energy-efficiency requirements
Renewable Energy & Grid Infrastructure
Solar inverters, wind power converters, and energy storage systems gain higher power density and improved reliability under grid disturbances
Industrial Power Supplies & Motor Drives
High-frequency switching, improved thermal margins, and surge robustness enable compact, high-performance industrial designs.
Aerospace & Defense Power Systems
Extreme environmental resilience, fast switching, and high voltage capability align with mission-critical reliability requirements
Green Hydrogen & Electrolysis Systems
High-efficiency rectification and robust high-voltage performance support continuous operation and long service life
Value Proposition
RIR’s SiC MPS diode portfolio offers several decisive advantages:
Higher System Efficiency – Reduced switching and conduction losses across operating conditions
Greater Ruggedness – Enhanced surge, avalanche, and thermal robustness
Design Flexibility – Simplified protection and reduced derating requirements.
Conclusion
As power electronics systems push toward higher voltages, higher switching frequencies, and more demanding operating environments, RIR Power’s SiC Merged-PiN Schottky diodes emerge as a clear advancement over conventional SiC Schottky devices. By combining efficiency with ruggedness, MPS technology enables designers to achieve higher performance without compromising reliability.
With the launch of its SiC MPS diodes, RIR Power Electronics Limited reinforces its leadership in high-power semiconductor innovation—delivering devices that are not only technologically advanced, but also engineered for real-world deployment across EVs, data centers, renewables, industrial systems, aerospace, and green hydrogen.
RIR is not merely supplying components, it is enabling the next generation of efficient and reliable power electronics solutions for the world. Powering Progress—Enabling Tomorrow
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