Why TSMC Matters: The One Taiwanese Company the World's Phones and AI Cannot Exist Without — and Why It Built a Fab in Japan

Why does a single chip manufacturer command this much global attention? The answer is that leading-edge semiconductor manufacturing has concentrated almost entirely in TSMC. This article explains, in plain terms, what TSMC actually is and how it became a company without a substitute. For the broader picture of how the semiconductor industry fits together, see our semiconductor beginner's roadmap (in Japanese).

What kind of company is TSMC?

TSMC (Taiwan Semiconductor Manufacturing Company) is the world's largest foundry — a company that takes on only the manufacturing of semiconductors. It has no chip brand of its own. Instead, it accepts production orders from fabless companies — design specialists such as Apple, NVIDIA and AMD that own no factories — and mass-produces their chips in the world's most advanced fabs.

Within the industry's division of labor between design and manufacturing, TSMC commits entirely to manufacturing. Because it owns no products, it never competes with its customers, so design companies around the world can hand over their production with confidence. That is the core of the business model.

How did TSMC reach the top of the world?

TSMC's strength is the product of three interlocking factors. First, the manufacturing-only model established by founder Morris Chang. Second, the enormous production volume that flows in from contract work worldwide. The more a fab manufactures, the more experience accumulates, the higher the yield (the share of good chips per wafer) climbs, and the lower costs fall.

Third is sustained, massive investment in leading-edge process nodes. TSMC deploys fleets of advanced EUV lithography machines and brings each new generation into volume production before anyone else. This virtuous cycle — scale drives yield, yield funds investment, investment drives more scale — pulled it decisively away from the pack. Samsung and Intel are chasing, but at the leading edge the gap in volume production keeps widening. For where TSMC sits in the industry's structure, see how the semiconductor industry works (in Japanese).

Why did Taiwan become a geopolitical front line?

Because leading-edge manufacturing concentrated in TSMC, Taiwan became a pressure point for the entire world economy. If a conflict were to break out over Taiwan, global supplies of everything from smartphones and AI hardware to cars could grind to a halt.

This single-point concentration risk gave rise to the U.S. CHIPS Act and its push to bring production back onshore, and to a global race to attract chip fabs.

Why did TSMC come to Japan (Kumamoto)?

TSMC built a fab in Kumamoto, Japan. The reasons: customers Sony and Denso are close by, the Japanese government offered generous subsidies, and a Japanese site diversifies the risk of concentrating everything in Taiwan. The full story of the site decision — the groundwater, the neighbor, the money — is in why TSMC built a fab in rural Kumamoto.

The move is regarded as the symbol of Japan's semiconductor revival, and it has lifted employment and capital investment across the surrounding region. As for why Japan itself remains indispensable to the global chip industry, see Japan's semiconductor equipment makers, mapped. This article is not investment advice.