Sony and TSMC lay groundwork for $6B joint factory in Japan

Sony Semiconductor Solutions and TSMC have signed a non-binding memorandum of understanding to create a joint venture focused on developing and producing next-generation CMOS image sensors. The facility will sit in Koshi City, Kumamoto Prefecture, the same region where the two companies already operate a separate chip fab through their JASM partnership.

The MOU, signed on May 8, sets the stage for what could become a roughly $6 billion-plus investment in Japanese semiconductor manufacturing. Sony will hold majority ownership of the new JV, a notable shift from the existing JASM arrangement where TSMC holds the controlling stake.

What the deal actually involves

The JV will operate out of Sony’s newly constructed fabrication facility in Kumamoto. Investment is expected to roll out in phases tied to market demand rather than arriving as one enormous lump sum. Sony also plans additional capital expenditures at its existing facility in Nagasaki, though those investments are contingent on support from the Japanese government.

Beyond consumer electronics, the partnership is targeting applications in what Sony describes as “physical AI,” a category that includes automotive sensors and robotics.

Building on an existing relationship

This isn’t the first time Sony and TSMC have teamed up in Kumamoto. The two companies are already partners in Japan Advanced Semiconductor Manufacturing, or JASM, alongside Denso and Toyota. JASM began volume production in late 2024 and represented TSMC’s first major manufacturing footprint in Japan.

In JASM, TSMC holds the majority stake while Sony, Denso, and Toyota serve as minority investors. The new JV flips that dynamic. Sony will be the majority owner, which gives it more direct control over the facility’s output and strategic direction.

Why Japan is betting big on chips

Japan’s semiconductor ambitions extend well beyond a single partnership. The country was once the global leader in chip manufacturing, commanding more than half of worldwide production in the late 1980s. That share has since dwindled to roughly single digits, with production migrating to Taiwan, South Korea, and mainland China.

The deal remains non-binding for now, meaning both sides still need to hammer out a definitive agreement and clear standard closing conditions.

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