The short version: two of the world's largest chipmakers have committed to a new generation of machine for printing circuits onto silicon. High NA EUV, which stands for High Numerical Aperture Extreme Ultraviolet lithography, is ASML's newest class of chip-printing equipment. TSMC and Samsung are both adopting it as artificial intelligence drives demand for chips that are smaller and more complex.
EUV lithography uses light with an extremely short wavelength to etch microscopic circuit patterns onto silicon wafers. The smaller the pattern the machine can print, the more computing capacity fits onto a single chip. High NA refers to numerical aperture, a measure of how tightly the machine's lens can focus that light. A higher numerical aperture means a finer focal point, which in plain terms means the ability to draw narrower lines on the silicon. Narrower lines allow smaller circuit features. Smaller features allow more transistors in the same area of silicon. More transistors means more computing capability per chip.
The demand AI is creating has two characteristics: chips that are smaller and chips that are more complex. High NA EUV is the industry's direct response to the smaller part.
TSMC, short for Taiwan Semiconductor Manufacturing Company, and Samsung are the two manufacturers named as committing to ASML's equipment. ASML makes the lithography machines both companies will adopt.
What this actually says is that AI is pushing chipmakers toward the most precise printing tools available. Large AI models require more compute per chip. More compute requires denser transistor layouts. Denser layouts require finer features. Finer features require a machine that can print them with greater precision. TSMC and Samsung committing to High NA EUV follows that chain.
Neither company has said when the new tools will enter active production, or how many machines each has ordered. The commitment is what was announced. The scale and timeline are not yet public.