TSMC and Samsung commit to High-NA — and to rebuilding the photomask to make it worth it

TSMC and Samsung committed to deploying ASML's High-NA EUV lithography systems — Samsung by 2028, TSMC by 2030 — as demand for advanced AI chips rises. Intel adopted High-NA first and is already running the tools. Separately, ahead of the SPIE BACUS conference, ASML and TSMC announced an industry initiative to move photomasks from today's 6-inch format to 12-inch, with Samsung and Intel joining; the plan targets a 12-inch mask pilot line in 2031 and advanced-node production around 2033. The reason is throughput: Intel's data presented at SPIE shows that stitching two exposures together — which current mask sizes force at High-NA field dimensions — drops scanner output from roughly 175 wafers per hour to about 125, a loss of nearly 30%.

Why it matters

For two years the open question was not whether High-NA works but whether the leading foundries would buy it. TSMC in particular had signalled it could stay on 0.33-NA EUV with multipatterning and reach comparable density at lower capital cost — a real alternative, since each High-NA scanner runs around $350M. Both committing settles that, and it settles it late enough that Intel's early bet now looks like a genuine process lead rather than an expensive detour.

The mask initiative is the more interesting half, and it is the kind of detail that gets lost. High-NA's higher numerical aperture buys resolution by halving the field it can print in one exposure. Anything larger than that half-field has to be printed twice and stitched, and stitching is what eats the 30%. So the tool the industry just committed to is one that, with today's masks, is materially slower per wafer than the tool it replaces. The 12-inch mask fixes the geometry rather than working around it — which is why three competitors who agree on very little are jointly funding a standard, and why the timeline runs to 2033.

That 2033 date is the number to hold on to. Every capacity forecast and cost-per-transistor curve built on High-NA assumes throughput that the ecosystem does not have yet and will not have for seven years.

What to watch

Whether Samsung's 2028 and TSMC's 2030 dates hold, whether the 12-inch pilot line stays on 2031, and whether Intel converts its head start into a node customers move to.