TSMC Revives Longtan for 1.4nm Fabs and CoWoS Hub as Both Sell Out Globally
According to supply chain sources cited by Liberty Times, Taiwan Semiconductor Manufacturing Co (TSMC) plans to restart Longtan Phase 3 in Taoyuan, building two to three 1.4nm A14 fabs and two advanced CoWoS packaging facilities after local opposition reversed. The five-facility plan was approved by Taiwan’s NSTC in May 2026 and sent to the Executive Yuan in June; land acquisition may run to 2029.
How this was made
The 30-second read
Why it matters
The key new information is the reported revival of a combined A14 logic and CoWoS packaging cluster at Longtan Phase 3, plus the status of approvals and remaining hurdles. This matters for AI supply-chain capacity expectations, but the production timeline is late-2028 and beyond.
Market read
Traders may use this as incremental evidence that TSMC is working to secure constrained CoWoS capacity alongside next-gen logic, but the investable catalyst is likely to be official confirmation and nearer production milestones.
What to watch
The article relies on supply-chain sources and does not quantify capex, customer commitments, or final go/no-go dates; traders may need confirmation from official TSMC filings or government documents.
Background
Longtan Phase 3 was previously shelved by TSMC in 2023 after local landowner opposition to compulsory acquisition; the article claims opposition has reversed and the plan has advanced through Taiwan’s science park and NSTC steps.
Ticker impact
Article says TSMC revived Longtan Phase 3 plans for 1.4nm A14 fabs plus CoWoS advanced packaging after local opposition reversed and approvals advanced.
Near-term: limited direct earnings impact due to 2028+ production timelines, but sentiment could improve on capacity visibility. Medium-term: supports upside optionality for AI-related wafer and packaging demand.
The piece is a new development in site planning and regulatory progression, but it also highlights major remaining hurdles (Executive Yuan review, EIA, land acquisition through 2029) and production targets (mid-2028 for A14).
Market effects
Strengthens the AI semiconductor supply-chain bottleneck story around advanced packaging (CoWoS) and leading-edge nodes (A14), potentially shifting expectations for capacity availability.
Highlights Taiwan’s domestic industrial policy and land/regulatory process as a gating factor for next-gen fab and packaging buildouts.
If realized, Longtan Phase 3 could reduce global uncertainty about AI accelerator supply by co-locating logic and advanced packaging capacity, though timelines extend into 2028-2029.
Counterpoint
Even with opposition softening and NSTC approval, the Executive Yuan review, environmental clearance, and land acquisition through 2029 could still delay or derail the plan, limiting tradable near-term impact.
Key entities
- companyTSMC
Taiwan Semiconductor Manufacturing Company, reported to be planning 1.4nm A14 fabs and CoWoS packaging at Longtan Phase 3.
- locationLongtan Phase 3 Science Park
Taoyuan district site in northern Taiwan, described as the only planned greenfield cluster to house both A14 logic and CoWoS packaging simultaneously.
- government_bodyExecutive Yuan
Taiwan’s executive branch review step that remains outstanding per the article.
- government_bodyNSTC
National Science and Technology Council, reported to have approved the Phase 3 proposal in May 2026.
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