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ROHM Develops 5th Generation SiC MOSFETs with Approx. 30% Lower On-Resistance at High Temperatures

ROHM has announced it has developed the latest device of its EcoSiC series: the 5^th Generation SiC MOSFETs optimised for high efficiency power applications.

The company says this technology is ideally 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, raising concerns about localised supply shortages. While smart grids that combine renewable energy sources (i.e., solar power) with existing power supply networks are emerging as a possible solution, minimising 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). Against this backdrop, 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.

Reported to be the first semiconductor company globally, ROHM says it was the first in the world 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. Furthermore, the 4^th 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, supporting the rapid market adoption of SiC technology.

The newly developed 5^th Generation SiC MOSFETs can achieve industry-leading low loss, driving the broader adoption of SiC technology. Through structural enhancements and manufacturing process optimisation, ON resistance is reduced by approximately 30% during high temperature operation (Tj=175°C) compared to conventional 4^th 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 5^th Generation SiC MOSFETs in 2025 and completed development in March 2026. Furthermore, starting from July 2026, ROHM says it will provide samples of discrete devices and modules incorporating 5^th Generation SiC MOSFETs.

Going forward, ROHM says it plans to expand its 5^th Generation SiC MOSFET lineup with additional breakdown voltage and package options. ROHM will also continue to enhance its design tools and strengthen application support. By further promoting the implementation of SiC technology – now entering the mainstream phase – ROHM contributes to more efficient power utilization across a wide variety of high-power applications.

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