TSMC Shifts Japan Plant to 3nm Chips, Targets 2028

TSMC Revises Kumamoto Plant Plan for 3nm Semiconductor Production

Japan’s Ministry of Economy, Trade and Industry (METI) announced on October 16 that it had approved a revised production plan from Taiwan Semiconductor Manufacturing Company Ltd (TSMC). The company will now produce 3-nanometer (nm) generation logic semiconductors exclusively at its second semiconductor plant under construction in Kumamoto Prefecture, Japan. The facility was previously planned to manufacture 6nm and 12nm chips, but the revised plan changes its production focus to the more advanced 3nm generation. The decision forms part of TSMC’s effort to strengthen its local manufacturing presence as demand for advanced semiconductors is projected to grow, particularly from AI data centers and autonomous driving applications.

Second Plant to Be Developed in Two Phases

The second Kumamoto plant will be developed in two phases, with the revised plan specifying changes to the semiconductor products and investment arrangements. During the first phase, the facility is expected to produce the equivalent of 6,000 12-inch wafers per month. The capital investment for this phase has been reduced to approximately USD 10.8 billion, while the government subsidy has also been lowered to a maximum of JPY 645.15 billion. These revised figures reflect the updated project plan approved by METI. Production capacity for the second phase has not yet been finalized, and the investment required for that stage will be determined later, based on the assumption that government support will continue.

First Kumamoto Plant Also Faces Production Changes

The revised plan extends beyond the second facility. According to the announcement, the types of semiconductors produced at Taiwan Semiconductor Manufacturing Company Ltd’s first plant in Kumamoto, as well as its production capacity, will also be changed. The announcement does not specify the revised chip categories or capacity figures for that first facility, so the precise operational changes cannot yet be established from the available information. Together, the changes to both plants indicate that TSMC is adjusting its manufacturing framework in Japan rather than treating the second plant’s move to 3nm production as an isolated change. Further details on the first plant’s updated production arrangements were not provided in the announcement.

Investment, Government Support, and Production Timeline

The second plant is scheduled to begin operations in December 2028. Its first phase carries an estimated capital investment of approximately USD 10.8 billion, with a subsidy of up to JPY 645.15 billion. Both amounts have been reduced under the revised plan. The project’s second phase remains less defined: its production capacity has not been finalized, and future investment amounts will depend on the assumption of continued government support. The announcement does not provide a confirmed second-phase timetable or final capacity. As a result, December 2028 is the stated operational target for the second plant, while the full scale and longer-term investment profile of the facility remain subject to further decisions.

Demand From AI Data Centers and Autonomous Driving

TSMC is strengthening its local production framework in Japan for advanced semiconductors amid projected demand from AI data centers and autonomous driving. These applications are central to the rationale described for expanding advanced-chip manufacturing in the country. The revised second-plant plan specifically prioritizes 3nm logic semiconductors instead of the previously planned 6nm and 12nm products. However, the announcement does not identify individual customers, confirm specific automotive supply agreements, or quantify how much production will be allocated to AI or autonomous-driving applications. The change establishes the intended manufacturing direction, but customer allocation, actual output, and the eventual contribution of the facility to these markets have not been disclosed.

Industry Impact & Outlook

The revised Kumamoto plan strengthens Japan’s stated effort to expand domestic access to advanced semiconductor manufacturing, with potential relevance for companies developing AI data centers and autonomous-driving systems. A shift to exclusive 3nm logic-chip production at the second plant could align its output more closely with demand for advanced computing, although the announcement does not confirm customer commitments or supply volumes for either application. The lower planned investment and subsidy also change the project’s financial framework, while the undecided second phase leaves its eventual production scale uncertain. The next important milestones are the scheduled December 2028 start of operations, further details on changes at the first Kumamoto plant, and decisions on the second phase’s capacity and investment under the assumption of continued government support.

Frequently Asked Questions

What change has METI approved for TSMC’s second Kumamoto plant?
Japan’s Ministry of Economy, Trade and Industry approved a revised plan under which TSMC’s second Kumamoto plant will exclusively produce 3nm generation logic semiconductors instead of the previously planned 6nm and 12nm chips. The facility is under construction in Kumamoto Prefecture, Japan, and is being developed in two phases. The revision also changes the planned production arrangements for TSMC’s first Kumamoto plant, including its semiconductor types and production capacity, although the announcement does not provide the specific revised details for that first facility.

When is the second Kumamoto plant expected to begin operations?
The second Kumamoto semiconductor plant is scheduled to begin operations in December 2028, according to the revised plan approved by METI. This is the stated operational target for the facility, which will focus exclusively on 3nm logic semiconductor production. The announcement does not establish a separate start date for the second development phase or provide its finalized production capacity. The overall timeline beyond the stated opening target therefore remains dependent on future project decisions, including the arrangements for the second phase and the assumption that government support will continue.

What are the planned investment and subsidy amounts for the second plant?
The revised plan reduces the second plant’s capital investment to approximately USD 10.8 billion and lowers the government subsidy to a maximum of JPY 645.15 billion. These figures relate to the revised project plan, while the facility is scheduled to begin operations in December 2028. The announcement does not provide a finalized investment amount for the second phase. Instead, future investment decisions will be made on the assumption that government support continues, meaning the total investment required for the full two-phase development has not yet been established.

How much semiconductor production capacity is planned for the first phase?
The first phase of the second Kumamoto plant is planned to produce the equivalent of 6,000 12-inch wafers per month. This capacity figure accompanies the revised plan to manufacture 3nm generation logic semiconductors exclusively at the facility. Production capacity for the second phase has not yet been finalized, so the announced first-phase figure should not be interpreted as the completed plant’s total capacity. The announcement also states that production types and capacity at TSMC’s first Kumamoto plant will change, but it does not specify the updated figures for that facility.

Why is TSMC expanding advanced semiconductor production in Japan?
TSMC is strengthening its local manufacturing framework in Japan for advanced semiconductors as demand is projected to increase from AI data centers and autonomous driving applications. The revised plan places 3nm logic-chip production at the center of the second Kumamoto plant’s intended operations, replacing its previous 6nm and 12nm production plan. However, the announcement does not disclose specific customer agreements, allocation volumes, or confirmed supply commitments for AI or automotive applications. The stated demand outlook explains the strategic context for the revision, but the exact distribution of future production remains unconfirmed.