ROHM has developed the latest device of its EcoSiC series: the 5th Generation SiC MOSFETs optimized for high efficiency power applications. This technology is suitable for automotive electric powertrain systems such as traction inverters for electric vehicles (xEVs) as well as power supplies for AI servers and industrial equipment such as data centers.
In recent years, the rapid proliferation of generative AI and big data processing has accelerated the deployment of high-performance servers in the industrial equipment sector. The resulting surge in power density is placing a greater strain on power infrastructure. Smart grids that combine renewable energy sources such as solar power with existing power supply networks are emerging as a possible solution, but minimizing losses during energy conversion and storage remains a key challenge.
In the automotive sector, next-generation electric vehicles require extended cruising range and faster charging, creating demand for lower-loss inverters and higher performance onboard chargers (OBCs). The adoption of SiC devices capable of both low loss and high efficiency is increasing in high-power applications ranging from a few kilowatts to hundreds of kilowatts.
ROHM was the first semiconductor company globally to begin mass production of SiC MOSFETs in 2010, contributing to reducing energy losses by implementing SiC devices over a wide range of high-power applications, including offering an early lineup of products compliant with automotive reliability standards such as AEC-Q101. The 4th generation SiC MOSFETs, for which sample provision began in June 2020, have been adopted globally in automotive and industrial applications. They are available across a broad product portfolio, including both discrete devices and modules.
The newly developed 5th Generation SiC MOSFETs achieve low loss through structural enhancements and manufacturing process optimization. ON resistance is reduced by approximately 30% during high temperature operation (Tj=175°C) compared to conventional 4th Generation products under the same breakdown voltage and chip size conditions. This improvement contributes to making units smaller while increasing output power in high temperature applications such as traction inverters for xEVs.
ROHM began supporting the bare dies business with 5th Generation SiC MOSFETs in 2025 and completed development in March 2026. Starting from July 2026, ROHM will provide samples of discrete devices and modules incorporating 5th Generation SiC MOSFETs.
ROHM plans to expand its 5th Generation SiC MOSFET lineup with additional breakdown voltage and package options. ROHM will also continue to enhance its design tools and strengthen application support.
Application Examples
Automotive Systems: xEV traction inverters, onboard chargers (OBCs), DC-DC converters, electric compressors
Industrial Equipment: Power supplies for AI servers and data centers, PV inverters, ESS (Energy Storage Systems), UPS (Uninterruptible Power Supplies), eVTOL, AC servos
EcoSiC is a brand of devices that utilize silicon carbide. ROHM independently develops the core technologies needed to advance SiC devices completely in-house, from wafer fabrication and process development to packaging and quality control. ROHM has established a fully integrated production system that spans the entire manufacturing flow.
Traction Inverter
Traction motors in electric cars are driven by 3-phase AC power with a phase shift of 120 degrees. Traction inverters convert direct current supplied from the battery into 3-phase alternating current.
