Metrology & inspection

Metrology and inspection tools are the quality-control eyes of every fab — the machines that measure what was just built and find microscopic defects while chips are still being made. Their importance compounds with every node: as features shrink and packages stack, more of a wafer's journey is spent being measured, because a single unseen defect destroys more value on a large AI die than it ever did on a small one. The market is strikingly concentrated — KLA holds the dominant share of process control, and actinic EUV mask inspection, which sees printable mask defects at the same wavelength the scanner exposes with, is effectively a one-vendor market held by Japan's Lasertec.

Yield-ramp speed is a competitive weapon between TSMC, Samsung and Intel, and it runs on inspection fleets from a concentrated two-country supply base. If inspection capacity binds — above all in single-sourced actinic mask inspection — node ramps slow and effective leading-edge output gets quietly capped, without any headline shortage to point at. KLA and Lasertec carry the concentrated exposure, and the process-control intensity of High-NA lithography and advanced packaging pulls the category deeper into the critical path with each generation.