How did TSMC's Arizona project grow from a US$12 billion fab to a US$265 billion cluster?
TSMC expanded Arizona in stages rather than by replacing its original project all at once. A federally and state-supported 5nm fab became a two-fab plan, then gained CHIPS Act support and a third-fab proposal. TSMC subsequently committed US$100 billion for additional fabs, packaging plants and R&D, moved the third fab into construction, and began work on the fourth fab and its first Arizona packaging plant. The US$265 billion figure is therefore a planned cluster investment: money committed to fabs and packaging that are planned or under construction, several of them without a firm schedule, not capacity available to supply customers today.
Trace the chain
The initial footprint
- 1Original 5nm fabAnnouncement
TSMC announces a US$12 billion 5nm fab in Arizona
TSMC said it intended to build and operate an advanced fab in the United States with support from the federal government and the State of Arizona: 5-nanometer technology, 20,000 wafers a month, over 1,600 jobs, about US$12 billion of spending from 2021 to 2029, construction from 2021 and production in 2024.
TSMC Newsroom ·
Construction is planned to start in 2021 with production targeted to begin in 2024
Why it matters here. Federal and state backing for a 5nm U.S. fab gave TSMC an Arizona project it could equip and enlarge.
TSMC Arizona: From a $12 Billion Fab to a $265 Billion Gigafab Cluster
- 2Two-fab planAnnouncement
Tool-in ceremony: first fab moves to N4, second fab announced for 3nm in 2026, US$40 billion total
At the ceremony marking the arrival of manufacturing equipment, attended by President Biden, TSMC said the first fab would begin N4 production in 2024 and that construction of a second fab had started, with 3nm production scheduled for 2026. The two fabs together were put at about US$40 billion.
TSMC Newsroom ·
TSMC has also started the construction of a second fab which is scheduled to begin production of 3nm process technology in 2026
Why it matters here. The N4 first fab and newly started second fab preceded preliminary CHIPS Act support and a planned third fab that expanded the Arizona site further.
TSMC Arizona: From a $12 Billion Fab to a $265 Billion Gigafab Cluster
Federal-backed expansion
- 3CHIPS support and Fab 3Regulatory
Up to US$6.6 billion in CHIPS Act funding; third fab planned; second fab moves to 2nm and 2028
TSMC Arizona and the U.S. Department of Commerce announced a preliminary agreement for up to US$6.6 billion in direct CHIPS Act funding. TSMC added a third Phoenix fab for 2nm or more advanced processes by the end of the decade, taking the site to more than US$65 billion. The first fab was described as on track for 4nm production in the first half of 2025, and the second fab was now to produce 2nm as well as 3nm, with production beginning in 2028 rather than 2026.
TSMC Newsroom ·
The third fab will produce chips using 2nm or more advanced processes, with production beginning by the end of the decade.
Why it matters here. The proposed US$6.6 billion CHIPS Act award and planned third fab preceded TSMC's US$100 billion commitment for additional fabs, packaging facilities and an R&D center.
TSMC Arizona: From a $12 Billion Fab to a $265 Billion Gigafab Cluster
- 4US$165 billion expansionAnnouncement
TSMC adds US$100 billion for three more fabs, two packaging plants and an R&D center: US$165 billion total
Announced at the White House with President Trump, the expansion took TSMC's planned U.S. investment from US$65 billion to US$165 billion, covering three additional fabs, two advanced packaging facilities and a major R&D team center in Arizona.
TSMC Newsroom ·
The expansion includes plans for three new fabrication plants, two advanced packaging facilities and a major R&D team center.
Why it matters here. The US$165 billion plan for three more fabs, two packaging plants and an R&D center required the physical buildout that next began with the third fab.
TSMC Arizona: From a $12 Billion Fab to a $265 Billion Gigafab Cluster
Building the cluster
- 5Fab 3 breaks groundUpdate
TSMC breaks ground on its third Arizona fab, slated for N2 and A16
TSMC broke ground on its third Phoenix fab on April 29, 2025, with Commerce Secretary Howard Lutnick attending. TSMC's Arizona site page says the fab is slated for N2 and A16 process technologies.
TSMC Arizona ·
In April 2025, TSMC broke ground on the site of the third fab, slated for N2 and A16 process technologies.
Why it matters here. Breaking ground on the third fab moved the multi-fab plan into construction, and work extended from there to the fourth fab and the first packaging plant.
TSMC Arizona: From a $12 Billion Fab to a $265 Billion Gigafab Cluster
- 6Fab 4 and packaging startUpdate
Initial construction starts on fourth Arizona fab and packaging plant
TSMC started initial construction on its fourth Arizona fab and first advanced-packaging plant. The City of Phoenix reported that TSMC announced the start during the preceding month.
City of Phoenix ·
Just last month, TSMCannounced that initial construction had started on the fourth fab and the first advanced packaging plant which is a key supply chain cog.
Why it matters here. Initial construction of the fourth fab and the first advanced-packaging plant was underway before TSMC announced another US$100 billion for Arizona, taking its planned state total to US$265 billion.
TSMC Arizona: From a $12 Billion Fab to a $265 Billion Gigafab Cluster
- 7US$265 billion planAnnouncement
Another US$100 billion for Arizona: total reaches US$265 billion for more 2nm fabs and packaging
Alongside second-quarter 2026 results, chairman C.C. Wei said TSMC would invest an additional US$100 billion in Arizona to build several more wafer fabs for 2-nanometer and below technologies plus advanced packaging fabs, bringing the state total to US$265 billion. Wei said there was a plan but no firm schedule for the new sites.
CNBC ·
TSMC will invest an additional $100 billion in Arizona to meet strong customer demand, bringing its total investment in the state to $265 billion, Wei added.
Why it matters here. Because the additional US$100 billion had no firm schedule, the US$265 billion total describes planned Arizona investment rather than capacity already available for supply.
TSMC Arizona: From a $12 Billion Fab to a $265 Billion Gigafab Cluster
Changes to this chain
- Proposal #54 rejected (verify:v6)
- Proposal #45 accepted (verify:v5): why of step 7 -> Because the additional US$100 billion had no firm schedule, the US$265 billion total describes planned Arizona investment rather than capacity already available for supply.
- Step 6 why edited by the editor: Use the entries' own naming for the fabs
- Step 5 why edited by the editor: Use the entries' own naming for the fabs
- Step 4 why edited by the editor: Use the entries' own naming for the fabs
- Proposal #35 accepted (verify:v1): why of step 2 -> The N4 first fab and newly started second fab preceded preliminary CHIPS Act support and a planned third fab that expanded the Arizona site further.; why of step 3 -> The proposed US$6.6 billion CHIPS Act award and planned third fab preceded TSMC's US$100 billion commitment for additional fabs, packaging facilities and an R&D center.; why of step 6 -> Initial construction of Fab 4 and the first advanced-packaging plant was underway before TSMC announced another US$100 billion for Arizona, taking its planned state total to US$265 billion.
Timelines in this chain
- TSMC Arizona: From a $12 Billion Fab to a $265 Billion Gigafab Cluster
- Intel Foundry and 18A: From IDM 2.0 to a Government-Owned Stake
- Nvidia Data Center GPUs: Hopper, Blackwell and Vera Rubin
A chain is written by the editor from entries already published on the timelines above, each of which was read against its source before publication. The chain changes when those entries do. Data and terms.