TSMC’s Arizona campus keeps getting bigger. What started as a $12 billion plan is now a roughly $165 billion commitment for a six-fab cluster north of Phoenix, the largest foreign direct investment in U.S. history. The first fab is already making chips. The rest are racing to catch up.
Project Scope
- A planned “gigafab” cluster of six fabs, plus two advanced-packaging facilities and a research and development center, on the north Phoenix campus.
- Fab 21’s first phase began high-volume 4nm production in late 2024; the second fab finished construction in April 2026, with commercial output expected in the second half of 2027.
- Investment scaled from $12 billion to about $165 billion, supported by CHIPS Act incentives, and TSMC has floated growing the site to as many as 12 fabs.
- Finished wafers head to an Amkor advanced-packaging plant in nearby Peoria, with Apple among the marquee customers.
Why It Matters
For the first time, the most advanced logic chips are being made on U.S. soil at scale, not just designed here. That’s the headline, and it’s real. The harder questions sit underneath it. Ramping leading-edge nodes far from TSMC’s Taiwan base has meant importing expertise, training a new workforce, and running a water-hungry process in the desert. The economics depend on demand holding and the later fabs filling up. The first chips are flowing, which is more than most onshoring bets can say. It sits alongside other U.S. fab projects like the Texas Instruments Sherman complex.
Project Team & Details
| Developer | TSMC (Taiwan Semiconductor Manufacturing Company) |
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| Owner / Client | TSMC Arizona |
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| Status | Under Construction |
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| Funding Source | Mixed |
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