Skip to content
AI supply chain term

Wafer fab

A wafer fab is the specialized factory where raw silicon wafers are processed into finished semiconductor chips.

What it means

A wafer fab (short for fabrication plant) is the ultra-clean factory where blank silicon wafers are turned into working chips through hundreds of sequential steps: deposition, lithography, etching, doping, and polishing. It sits at the very front of the AI supply chain, because every GPU, accelerator, and memory die begins as patterns printed on a wafer inside a fab. Building one takes years and enormous capital, and the most advanced fabs, those running leading-edge process nodes, are concentrated in a handful of companies and regions. That scarcity makes foundry capacity the original bottleneck. When demand for AI chips surges, new wafer starts cannot simply be conjured; output is limited by cleanroom space, lithography tools, and skilled operators committed years in advance.

Why it matters to investors

Because leading-edge fab capacity is booked far ahead and hard to expand, the firms that own it or supply its critical tools hold real pricing power. TSMC dominates advanced foundry output, while ASML and Tokyo Electron sell the equipment every fab depends on; SMIC represents China's push to build domestic capacity under export limits.

See Wafer fab in the AI value chainIts live model score, why it matters, and every company exposed to it.

Companies on this part of the chain

TSMCTSMASMLASMLTokyo Electron8035.TSMIC (Semiconductor Manufacturing International Corp.)0981.HK

Named to show where the term sits in the AI supply chain — research, not advice, and never a recommendation to buy or sell.

Related terms

FoundryA factory that manufactures chips designed by others; leading-edge capacity is scarce.Silicon waferA silicon wafer is the thin, mirror-polished disc of ultra-pure crystalline silicon that every semiconductor chip is printed on.EUV lithographyExtreme-ultraviolet lithography — the leading-edge chip-printing tech, supplied by a single vendor.Process node (nm)A process node is the generation of chipmaking technology — labeled in nanometers like 3nm or 2nm — that defines how small and dense a chip's transistors can be.

See Wafer fab in the live AI chain.

THE ENTITY maps every constraint onto one live model — which part is tight now, who owns it, and who gets squeezed when it moves. Plain-English reads you can check.

Explore the features
All glossary terms

THE ENTITY is an educational read on the AI supply chain — research, not investment advice. It explains how the chain works and who sits where, never price targets or buy/sell calls.