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AI supply chain term

DUV lithography

DUV lithography is the deep-ultraviolet light-based printing process fabs use to pattern most chip layers, including mature and many mid-range advanced nodes.

What it means

Deep ultraviolet (DUV) lithography uses ultraviolet light — typically 193nm wavelength, often with water immersion to sharpen the image — to project circuit patterns from a mask onto a wafer. It is the workhorse of chipmaking: the majority of the layers on almost every chip, and the entire process for older and mid-range nodes, are printed with DUV. For the very smallest features on leading-edge logic, fabs increasingly rely on EUV instead, but DUV remains essential and is still used for most steps even on advanced nodes. Because DUV scanners are complex, expensive tools built by only a few suppliers, and because export controls now govern the most capable systems, DUV capacity sits in the AI supply chain as both a manufacturing enabler and a policy-sensitive constraint.

Why it matters to investors

DUV tools come from a tiny group of equipment makers, so demand for new fabs flows straight to their order books. DUV is also central to export-control debates, which makes the firms that build these scanners — and the foundries that depend on them — exposed to geopolitics as much as to chip demand.

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

Companies on this part of the chain

ASMLASMLTSMCTSMTokyo 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

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.FoundryA factory that manufactures chips designed by others; leading-edge capacity is scarce.Wafer fabA wafer fab is the specialized factory where raw silicon wafers are processed into finished semiconductor chips.

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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.