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On September 19, Renesas published a strategic article on its official blog, where Vice President Primit Parikh clearly stated: “GaN will be the core of power electronics in the next decade.”
As a long-time industry observer, “Chip Chef” believes: this is not just a technical explanation, but more like an industrial declaration. Coupled with Renesas’ previous investments in SiC and recent actions to enter the NVIDIA 800V HVDC ecosystem through Flex Power Modules, it is evident that:GaN has been defined by Renesas as a strategic pivot for breakthrough.
The following is the original blog post:
Driving the Future with Gallium Nitride: Renesas Invests in Wide Bandgap Innovation
Author: Primit Parikh, Vice President of Renesas GaN Division
Traditional silicon semiconductors are struggling to meet the performance, density, and efficiency benchmarks required by the new generation of computing and energy conversion platforms, which range from AI-focused data centers to electric vehicles (EVs) and industrial robots. As applications migrate to higher frequencies, the demand for faster switching speeds, lower losses, and smaller heat dissipation systems becomes increasingly evident.
Wide bandgap semiconductors, especially Gallium Nitride (GaN), are breaking through the physical limitations of silicon and silicon carbide (SiC), filling the gap with inherently superior performance metrics. With faster switching frequencies, lower conduction and switching losses, and better thermal management, GaN enables compact power supplies that support extremely high power densities in AI and high-performance computing (HPC) workloads within data center racks. GaN reduces weight and extends the range of onboard chargers and DC/DC converters in electric vehicles, enhances the efficiency of factory robot motor drives, and enables efficient compact renewable energy systems such as uninterruptible power supplies (UPS) and photovoltaic microinverters.
Renesas and Our GaN Journey
To meet customer demands, Renesas continues to expand its GaN product portfolio, with the most significant move being the acquisition of GaN pioneer Transphorm in 2024. The company originated from the University of California, Santa Barbara (UCSB) and its renowned Solid-State Lighting and Energy Electronics Center (SSLEEC).
With 17 years of intellectual property and product maturity, Transphorm’s SuperGaN® technology platform is based on a normally-off depletion-mode (d-mode) GaN power field-effect transistor (FET), which combines high-voltage d-mode GaN high electron mobility transistors (HEMTs) with low-voltage silicon MOSFETs. This design inherits the high-voltage switching performance advantages of GaN while maintaining the usability and robustness of silicon-based drive interfaces, thereby simplifying adoption across high-performance and high-reliability applications.
This acquisition includes over 1,000 proprietary and licensed patents, giving Renesas control over Transphorm’s GaN intellectual property, products, and manufacturing, including production capacity in Japan and Taiwan, as well as R&D in California. In early 2025, Renesas announced an agreement with Polar Semiconductor in Minnesota, USA, to manufacture 200mm GaN-on-Si devices starting in 2027, expanding critical capacity sources in the U.S.
By integrating GaN with Renesas’ power controllers and drivers (including integrated IC+GaN products) and a rich microcontroller product portfolio along with Winning Combination reference designs, we will provide turnkey GaN solutions from fast chargers to megawatt-level AI servers in the future.
Areas Where GaN Makes the Most Impact
Currently, data centers are the most obvious beneficiaries of GaN adoption. To support AI and HPC workloads, rack power consumption has expanded from tens of thousands of watts to 600kW per rack, with AC/DC conversion systems reaching 1MW. In addition to power density, AI data centers also benefit from bidirectional power topologies (such as Vienna rectifiers) and higher switching frequencies to cope with the growing scale. Hyperscale data centers have expanded from about 10,000 square feet a decade ago to over 1 million square feet today, with operators planning to triple capacity by the end of this decade.¹
GaN features low switching losses, high efficiency, and higher operating frequencies than silicon and SiC, enabling advanced topologies such as high-density DC/DC converters and bridge-less totem pole power factor correction (PFC) with 99% efficiency. In July 2025, Renesas released three new 650V fourth-generation Plus GaN FETs, marking the first major product release after the acquisition of Transphorm, with a 14% reduction in chip area and a 20% improvement in performance metrics compared to the previous generation.
GaN Targeting Electric Vehicles and Industrial Robots
GaN is also suitable for onboard chargers and DC/DC converters in electric vehicles. With unique bidirectional devices (BDS) supported by GaN’s lateral structure, GaN simplifies AC/DC conversion topologies that require bidirectional current, reducing component count, improving system efficiency, and decreasing the size and weight of charging systems. GaN technology has been introduced to tier-one suppliers and OEMs, with applications expected to begin as early as 2030 models and beyond.
Although SiC currently dominates traction inverters, GaN is expected to enter charging and auxiliary systems first, which require extremely high power density, eventually expanding into traction applications, with positive EV ODM/OEMs exploring this direction. In industrial robots and automation products, efficiency, reliability, and compact form factors are crucial. GaN can enhance the efficiency and miniaturization of servo and AC drives, resulting in lighter, more flexible robotic arms and reduced system costs.
Challenges and Opportunities for GaN
The potential of GaN becomes increasingly clear with each generation of products, currently transitioning from 150mm to 200mm wafers, with long-term plans to move to 300mm wafers to match the economics of silicon. Renesas’ differentiated advantage lies in its mature d-mode high-voltage SuperGaN technology, integration capabilities with controllers and drivers, and world-class system-level design support.
To meet the stringent specifications of high-reliability markets such as automotive and industrial automation, Renesas’ GaN product portfolio exceeds current JEDEC JESD47 semiconductor reliability standards and achieves high reliability in switching lifetime tests such as HTOL. Additionally, our latest Gen4 Plus platform is expected to meet automotive-grade certification (AEC Q101) by mid-2027. Advanced packaging is another key factor in reducing GaN parasitic effects and optimizing thermal performance. Renesas offers one of the industry’s broadest packaging combinations, including emerging top-side cooled (TOLT) and integrated driver-FET solutions.
These design and manufacturing challenges also present opportunities to enhance scale efficiency, establish reliability benchmarks, achieve packaging standardization, and assist customers in transitioning from discrete devices to system-level solutions.
Looking Ahead: Renesas’ GaN Journey
The major trend driving GaN is rapidly penetrating AI data centers, electric vehicle power systems, industrial robot servo drives, and renewable energy power conversion systems. In addition to the mature high-voltage GaN (650V+), Renesas is developing low-voltage GaN (40V–200V) products to extend advantages to secondary power conversion, such as AI high-voltage direct current (HVDC) systems (48V down to 12V or 1V), PC client computing, battery management, industrial power tools, and micro-mobility. This strategy positions GaN as the core of Renesas’ wide bandgap product portfolio and will shape the development of power electronics over the next decade, leveraging Renesas’ extensive system expertise in microcontrollers, SoCs, analog, and power management. Wherever high density, high efficiency, and high reliability are needed, GaN can provide support.
Through the acquisition of Transphorm and ongoing investments in GaN innovation, Renesas is building scale, reputation, and ecosystem support to make GaN a mainstream technology. While the challenges of manufacturing, packaging, and product certification for larger diameter wafers are significant, they also contain major opportunities to reshape power electronics.
Looking to the future, Renesas’ continuously expanding GaN product portfolio will empower designers to create smaller, faster, more efficient, and more reliable systems, driving the next generation of power electronics to build a safer, smarter, and more sustainable future.
Industry Observation Notes
From SiC’s Sunk Costs, HVDC Supplementation to GaN Breakthrough, Renesas’ trajectory is indeed distinct; viewed from another perspective, these three acts resemble a common mirror of the entire wide bandgap industry:
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Boundaries of Material Narratives: SiC and GaN each have intrinsic advantages, but must also overcome three hurdles: capital intensity, yield ramp-up, and long-term reliability. Relying solely on discrete devices is insufficient to independently support system-level performance and cost objectives.
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Emphasis on System Narratives: The integrated architecture represented by HVDC is shifting the value focus from “better materials” to “better systems.” Material advantages can only be fully realized when embedded in controlled topologies, controls, and thermal/electrical parasitic management.
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Objective Constraints of Cycles: On one end, the financial impact of approximately $2 billion in prepayment re-evaluations, and on the other end, the CapEx and yield ramp-up requirements corresponding to the transition to 200mm processes and packaging upgrades such as top-side cooling/integrated driver-FET—currently more like a phase of aligning technology, capacity, and cash flow.
Therefore, a more worthwhile question for the industry to ponder is not whether “a certain company can break through,” but:
👉 In the context of accelerating AI factories, electric vehicles, and energy transitions, can companies still rely on a single material route? Or do they need to integrate devices, controllers/drivers, packaging/modules, and reference designs into replicable system solutions, supplemented by multi-source capacity layouts and contractual mechanisms such as long-term supply, buyback, and joint investment to hedge against the uncertainties of process ramp-up and market introduction, thereby maintaining long-term competitiveness?
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