GlobalFoundries and TSMC have signed a $2 billion agreement under which GlobalFoundries will supply silicon interposers for TSMC's CoWoS advanced packaging platform, according to a report by Chinese outlet 超能网.

The deal addresses a specific chokepoint in the advanced semiconductor supply chain. CoWoS (Chip-on-Wafer-on-Substrate) packages combine logic dies and high-bandwidth memory on a silicon interposer, and interposer capacity has constrained output of AI accelerators and other high-performance devices. TSMC has repeatedly flagged packaging capacity, not front-end wafer supply, as the binding limit on shipments.

Details of the source report are limited to the headline announcement. The reported figure of $2 billion and the scope of the agreement — silicon interposers for CoWoS — are the confirmed elements at this stage.

What does the agreement cover?

The contract positions GlobalFoundries as a supplier of silicon interposers, the passive wafers that carry high-density wiring between compute dies and stacked memory in 2.5D packages. Key points from the announcement:

• Contract value: $2 billion
• Supplier: GlobalFoundries
• Buyer: TSMC
• Product: silicon interposers for the CoWoS advanced packaging family

Why does interposer supply matter?

Interposers sit at the center of the advanced packaging bottleneck. AI accelerator demand has pushed CoWoS capacity to its limit, and TSMC has expanded packaging output aggressively to keep pace with orders for high-performance computing customers.

Bringing GlobalFoundries into the interposer supply chain adds a second large-scale manufacturer to a step previously handled largely in-house. For GlobalFoundries, the deal represents a revenue stream outside its core specialty logic business.

No timeline for deliveries, volume commitments, or facility allocations formed part of the reported announcement. Additional terms, including which GlobalFoundries fabs will produce the interposers, remain undisclosed.

What happens next?

Both companies typically confirm contractual details through official statements or regulatory filings. Watch for confirmation of:

• Delivery schedules and volume targets
• Production sites within GlobalFoundries' fab network
• Whether the arrangement covers current-generation CoWoS or future variants

Die Signal will update this story as manufacturers publish specifics.