TSMC Taps GlobalFoundries for $2B in AI Chip Interposers
2 min readTSMC, the Taiwanese foundry that builds most of the world’s leading AI accelerators, is handing part of a critical packaging step to an outside partner. In the TSMC GlobalFoundries deal announced on October 8, GlobalFoundries will manufacture silicon interposers for TSMC’s CoWoS advanced packaging under a multi-year, $2 billion agreement, with production based in New York.
What an Interposer Does
Modern AI chips are no longer single slabs of silicon. Top accelerators combine processor dies with stacks of high-bandwidth memory, and those pieces need a foundation that wires them together at very high speed. That foundation is the silicon interposer, a thin layer that sits beneath the chips and carries thousands of dense connections between them. TSMC’s CoWoS (chip on wafer on substrate) platform is the industry’s main way of building these packages, and packaging capacity has been one of the tightest bottlenecks of the AI boom.
Inside the TSMC GlobalFoundries Deal
According to TechNode, the agreement has an initial five-year term plus a framework for further capacity expansion. GlobalFoundries will expand its Malta, New York fab to produce the interposers, including embedded deep trench capacitor components, and expects volume production to start ramping in the first half of 2028. The company calls itself the first US-based source of silicon interposers for advanced packaging, and its shares rose about 4 percent in premarket trading after the news, Reuters reported.
GlobalFoundries supplies manufacturing services only. TSMC still runs the CoWoS ecosystem, and the companies did not disclose annual output, end customers, or which AI chips will use the parts.
Why It Matters
For TSMC, the deal adds a second source for a key component without giving up control of its packaging franchise. It also arrives while demand keeps climbing: TSMC’s September sales hit another record on AI chip orders, and a TSMC-anchored advanced packaging park broke ground in Kaohsiung in September.
The New York location matters too. Washington has pushed to bring more of the AI supply chain onshore, and a domestic interposer source gives US chip designers a slice of packaging that does not depend entirely on Taiwan. Watch whether TSMC signs similar outsourcing deals, and whether a 2028 ramp is soon enough to ease a squeeze that AI demand keeps tightening.