AI chip demand strains substrate supply through 2028

The AI boom has shined a bright light on semiconductor design and manufacturing, but the supply chain extends far deeper than chip fabs. Substrates—the layered material foundation on which silicon dies are mounted—are a less visible but equally vital component. As demand for AI accelerators and processors has surged, substrate manufacturers have struggled to keep pace, creating a tightening in global capacity that is now expected to persist for years.

This shortage matters because substrates are not easily substituted or rapidly scaled. Unlike some other chip components, substrate production involves specialized equipment and long lead times. When demand for CPUs, GPUs, and ASICs rises sharply—as it has with the AI wave—the substrate supply chain becomes a chokepoint. The result is predictable: higher costs passed on to chip buyers, delayed shipments, and uneven allocation of capacity to major customers. Businesses and cloud providers that depend on steady flows of advanced AI processors are likely to face both price pressure and access constraints as the shortage works through the supply chain.