Sony Group and TSMC have signed a binding agreement to establish a $4.69 billion joint venture in Kumamoto, Japan, dedicated to manufacturing next-generation smartphone image sensors. The deal signals a major expansion of Taiwan's leading chipmaker into the Japanese semiconductor landscape and deepens the partnership between the world's dominant contract chipmaker and the leading global supplier of CMOS image sensors.

The new entity, named Advanced Vision Semiconductor Manufacturing Corp., will be headquartered in Koshi City, Kumamoto Prefecture, according to a statement from TSMC.

Sony Holds Controlling Stake

Sony's semiconductor division, Sony Semiconductor Solutions, will retain a controlling stake and operate the venture as a subsidiary of Sony Group. A director will be appointed from Sony's side to oversee operations. Sony currently supplies image sensors used in iPhones and many flagship Android devices, giving the venture a direct link to the highest-volume end market for the technology.

The capital contributions are split unevenly. Sony Semiconductor Solutions plans to invest approximately 465 billion yen (roughly $2.92 billion) through a combination of cash and assets transferred via a corporate split. TSMC's share amounts to about 282 billion yen. According to Nippon.com, citing Jiji Press, the combined investment totals 747 billion yen, equivalent to approximately $4.69 billion based on the exchange rate of 159.33 yen per dollar reported by Reuters.

TSMC indicated that the investment will be contributed in stages, calibrated to market demand and business conditions, allowing both partners flexibility to adjust the pace of funding if orders decline.

The Taiwanese chipmaker also noted that the investment is contingent on sufficient financial backing from the Japanese government. The partners intend to seek support from the Ministry of Economy, Trade and Industry. Tokyo has already invested heavily in attracting semiconductor manufacturing to Japan, including subsidies for TSMC's earlier Kumamoto fabs, and this venture is structured with the expectation of continued government participation. Japan's push to rebuild domestic chip production capacity has been a cornerstone of METI policy in recent years, aimed at strengthening supply chain resilience after global semiconductor shortages exposed vulnerabilities.

Division of Responsibilities

Sony Semiconductor Solutions will lead core sensor technology development, product planning, and design. The venture will leverage TSMC's advanced-process technology and manufacturing expertise to bring those designs into mass production. The two companies stated they "intend to accelerate the commercialization of image sensor products driven by customer needs," according to TSMC.

Full commercial production is scheduled to begin in 2029. The plan integrates new development and production capacity into an existing Sony image sensor plant in Koshi. The venture will target not only the smartphone market but also the AI, automotive, and broader mobile sectors. Image sensors are becoming increasingly central to applications beyond handset cameras, including advanced driver-assistance systems, industrial automation, and edge-AI vision, broadening the potential customer base for the venture's output.

TSMC's Expanding Kumamoto Footprint

TSMC's first advanced wafer facility in Kumamoto, operated by its JASM subsidiary, began commercial operations at the end of 2024 using specialty processes. A second fab is currently under construction, with 3-nanometer mass production expected to commence in 2028. The Sony joint venture adds a third pillar to TSMC's Kumamoto operations and reinforces the site as one of the most concentrated semiconductor hubs outside Taiwan.

Kumamoto Prefecture already hosts a growing local semiconductor supply base. Locating the Sony joint venture there positions it alongside existing TSMC manufacturing capacity.

The companies first outlined the plan in May through a nonbinding memorandum of understanding. Following a two-day meeting, the partners converted that initial intention into a legally binding definitive agreement.