Renesas to Close Takasaki 6-Inch Wafer Plant Within Three Years
The semiconductor leader will shutter its Gunma manufacturing facility to pivot toward R&D for data center and automotive power chips.
Renesas Electronics has announced it will phase out production at its Takasaki Factory in Gunma Prefecture, Japan. The move signals a strategic shift away from legacy manufacturing as the company navigates structural changes in the global semiconductor supply chain.
Manufacturing operations at the facility, which operates a 6-inch wafer line, will be gradually scaled down and fully discontinued within the next two to three years. Following the cessation of production, the factory will be closed. Despite the end of manufacturing, Renesas stated it will maintain and strengthen the site's research and development (R&D) functions to ensure continued innovation.
The Obsolescence of 6-Inch Lines
The decision is driven by systemic shifts in how semiconductors are produced. According to Renesas Electronics Corporation, the industry is facing structural changes specifically affecting 6-inch wafer lines, as production materials and maintenance support for aging equipment and utility facilities are being discontinued.
As the broader semiconductor industry migrates toward larger wafer sizes and more modern fabrication processes, older 150mm (6-inch) lines have become increasingly difficult to sustain. The lack of available spare parts and specialized materials for legacy machinery makes the continued operation of such plants technically and economically unsustainable.
Strategic Realignment
This transition allows Renesas to align its resources with high-growth strategic sectors. By repositioning the Takasaki site to focus on R&D, the company is prioritizing the development of analog ICs and discrete power semiconductors. These components are critical for the expanding infrastructure of data centers and the evolving requirements of automotive applications.
By shifting away from legacy fabrication, Renesas is mitigating the risk of supply chain obsolescence. The move reflects a wider industry trend where firms are abandoning aging fabs in favor of more efficient, scalable technologies that can meet the precision and volume demands of modern electronics.
Future Outlook
While the manufacturing footprint in Gunma will shrink, the strengthening of R&D functions suggests that Takasaki will remain a hub for the company's intellectual property and design efforts. The company has not detailed which specific product lines will be migrated to other facilities to replace the Takasaki output, but the focus remains on securing the supply chain for next-generation power semiconductors.