TSMC Is Locking In CoWoS Capacity Beyond 2028
TSMC has signed a seven-year capacity outsourcing agreement with Xintec, extending through December 2033, for the on-substrate (oS) stage of CoWoS packaging.
The new line will operate inside TSMC's Central Taiwan Science Park facilities, with initial mass production targeted for 2029. Xintec plans to raise NT$15B through convertible bonds to fund equipment and production systems.
The strategic signal matters more than the immediate revenue contribution.
TSMC is not simply adding packaging capacity. It is extending its production network through a long-term partner, shifting part of the equipment investment and operating responsibility outside its own organization while retaining control over specifications, quality and yield.
The 2029 start date is particularly telling. This is not a short-term response to today's CoWoS shortage. It reflects capacity planning for the next generation of AI accelerators.
For Xintec, the opportunity comes with concentration risk: TSMC already owns approximately 41% and accounts for more than 70% of its revenue.
The AI packaging bottleneck is driving a structural change in how capacity is financed, built and operated. TSMC is preparing for demand well beyond the current expansion cycle.
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