Be it with hybrid, plug-in hybrid, or all-electric drivetrains, soon, every modern vehicle will be electrified. Mazda hasn’t been swift to embrace electrification, though, instead relying on its highly efficient internal-combustion engines. Still, that will soon change, with the Japanese automaker joining forces with ROHM to harness the potential of gallium nitride (GaN) power semiconductors — a next-generation technology poised to transform electric vehicle (EV) performance.
GaN semiconductors are gaining attention as a promising alternative to traditional silicon components. They offer lower power conversion losses and can operate at higher frequencies, enabling the development of smaller, lighter, and more efficient automotive systems. A great example is GaN phone chargers, which are significantly smaller than their silicon counterparts, while also delivering higher efficiency and safety.
With this in mind, Mazda and ROHM have announced a new phase in their ongoing partnership: the joint development of GaN-based automotive components aimed at next-generation electric vehicles. The collaboration builds upon a 2022 agreement between the two companies to co-develop inverters using silicon carbide (SiC) semiconductors. Now, the focus shifts to GaN, with both companies aiming to unveil a concept demonstration model by the end of FY2025. If successful, real-world implementation is targeted for FY2027.
The project’s overarching goal is to deliver system-level innovation that impacts the entire vehicle. Mazda plans to integrate the benefits of GaN semiconductors not just for power efficiency but also to enable new approaches to weight reduction and vehicle design. Meanwhile, ROHM will leverage its proprietary EcoGaN™ technology and supporting control ICs to optimize performance and miniaturization of power electronics.
From Mazda’s side, the collaboration reflects its commitment to delivering electric vehicles that preserve the brand’s signature driving feel. A great example would be the MX-5 Miata, a lightweight roadster that offers an exhilarating driving experience. Lightness is seen as the key to a good driver’s car, and GaN will allow Mazda to reach that goal with the usually heavier EVs.
To achieve that, the company aims to create a “new value chain” that directly connects semiconductor devices with vehicle development. ROHM, on the other hand, views the partnership as an opportunity to better understand the application-specific demands of GaN devices and fast-track their adoption in the automotive space.
If the companies succeed in achieving their milestones, this collaboration could mark a significant step toward more efficient and compact EV architectures — and set the tone for broader semiconductor adoption in mobility-focused industries.
