NEW YORK — What happened: Global semiconductor output continues to face constraints, not from silicon wafer fabrication plants, but from a critical shortage of advanced packaging facilities capable of assembling chiplets.
Why it matters: Modern high-performance processors are no longer built as a single monolithic block of silicon. Instead, they are broken into smaller chiplets—such as CPU cores, memory controllers, and I/O dies—stitched together on an interposer using advanced packaging techniques. Without packaging capacity, finished wafers cannot be turned into usable products.
Deep dive: Advanced packaging requires extreme precision, placing multiple silicon dice side-by-side or stacked vertically with microscopic copper pillars. Facilities capable of performing processes like chip-on-wafer-on-substrate (CoWoS) require specialized, high-cost cleanrooms and advanced robotic alignment tools. Because building these facilities takes years and billions of dollars, supply-chain bottlenecks have shifted downstream from the lithography machines to the back-end assembly lines.
Report check: Industry supply chain audits show packaging lead times remaining extended well into late 2026. While foundries are aggressively expanding capacity, equipment delivery delays for packaging lines are widely documented.
Open questions: Will regional fab subsidies successfully build out local advanced packaging ecosystems, or will assembly remain centralized in a few geographic locations?