China DUV Risks For ASML

A potential threat to ASML?

By Zeyao

The recent news that a Chinese-made immersion DUV lithography tool, linked to SiCarrier and its affiliate Yuliangsheng, has entered limited production has been framed by much of the financial press as a breakthrough capable of eroding ASML’s dominance and revenue base. The implicit assumption behind that framing is that price is the deciding factor: ASML’s machines cost tens of millions of dollars, a domestic Chinese alternative costs less and cheaper eventually wins. A closer, numbers-driven look at the economics of fab operations shows the opposite. Even in the extreme case where a Chinese DUV machine were handed to a fab manufacturer completely free of charge, a financially rational operator not swayed by political pressure would still choose to buy ASML’s machine at full price. The reason is that the purchase price of a lithography tool, however large it looks on an invoice, is a rounding error next to the revenue that tool’s performance determines over its operating life. Price is not the variable that decides this contest. Performance is, and the performance gap is large enough to make “free” irrelevant.

Start with a simple observation about how fabs actually make purchasing decisions. A lithography scanner is a capital expense, paid once. The wafers it produces are a revenue stream, collected every hour of every day for the machine’s entire operating life. Over that life, the two are not remotely comparable in scale, which is exactly why the acquisition price of the DUV machine (I’ll be using the NXT:1950i as the case study as it is the most relevant) , $30-45 million for the ASML machine or zero for the Chinese DUV is close to irrelevant to a financially rational buyer. Using representative figures for 28nm-class production, where wafer revenue runs around $3,000 per wafer, a machine running at 175 wafers per hour generates approximately $525,000 of theoretical hourly revenue. If an ASML tool operates at 97% uptime and a China DUV machine operates at 90% uptime, that 7-percentage-point gap alone costs approximately $36,750 per hour. Multiplied across 24 hours a day and 365 days a year, that single variable costs a fab approximately $322 million annually in missed revenue. That figure is roughly 8x larger than the entire $30-45 million ASML machine would have cost to buy outright. Put plainly, taking the free Chinese machine to avoid a $30-45 million purchase would cost the fab about $322 million a year in lost output. No fab manager who has done this arithmetic accepts a “free” machine on those terms given that the free machine is not a discount but rather a $322-million-a-year bill disguised as a gift.

Uptime is only part of the story and arguably not even the larger part. Yield, governed primarily by overlay accuracy, is the more consequential variable because it scales with every wafer produced rather than only with downtime hours. Overlay describes how precisely each lithography exposure aligns to the layers beneath it; lower overlay numbers mean higher precision and more functional dies per wafer. ASML’s currently shipped DUV tools for China, the TWINSCAN NXT:1980Fi, offer machine-matched overlay of 2.5nm. The domestic Chinese tool now entering production is architecturally comparable to the NXT:1950i, a design ASML first shipped around 2008 for 32/28nm-class single-exposure work. Reporting on advanced-node production in China using older-generation tools stretched through multi-patterning techniques indicates yields around 50%, compared to near 100% yields achieved by leading-edge fabs using modern single-exposure tools. A gap of that magnitude means a domestic machine, even if it were free and even if it somehow matched ASML on uptime, would still produce dramatically fewer sellable dies per wafer, a loss that compounds across every single wafer run, not just downtime windows. Combined, the uptime and yield gaps mean the true revenue penalty of operating a free domestic tool is considerably larger than the $322 million uptime estimate alone, which makes the “but it’s free” argument weaker still, not stronger. The zero purchase price buys the fab a bigger annual loss, not a smaller one.

This is also why the sticker price of a DUV machine is genuinely the least important variable in a fab’s decision. A lithography bay carries enormous fixed costs beyond the scanner itself which include cleanroom filtration and vibration isolation, metrology equipment, track coaters, etch and chemical-mechanical-polishing tools calibrated to that specific scanner’s alignment marks, and the trained engineering staff required to run it. That infrastructure is sunk regardless of which vendor’s machine occupies the bay, and it is only justified economically if the machine inside it maximizes revenue per square foot of cleanroom space per year which is a function of wafers/hour × yield% × uptime% × wafer price. Give a fab manager a free scanner with meaningfully worse overlay and reliability and the same expensive supporting infrastructure now produces less sellable output than it would with a $45 million ASML tool sitting in the same bay. The purchase price of the scanner itself is a small fraction of what that bay costs to run over its lifetime, so “free” does nothing to fix the underlying problem which is the fact that a free but underperforming machine still wastes the much larger, already-committed investment surrounding it. A rational fab manager evaluates the whole bay’s revenue per year, not the scanner’s price tag in isolation and by that measure the free machine is the more expensive choice.

A further factor, easy to miss because it lives in accounting conventions rather than headline specifications, is the gap between a lithography tool’s depreciation schedule and its actual operating life. Fabs typically write these machines off over a 5-year useful life for accounting purposes but ASML’s installed base routinely remains in active production for 15-20 years, with units from far older generations still running today decades past their book value. This matters in two ways. First, ASML’s 97% uptime figure comes from a track record proven across an operating horizon far longer than any domestic Chinese tool has existed (the domestic effort is only now entering limited production, with roughly 5 units expected this year). A fab taking the domestic alternative, even for free, is betting on 15-20 years of unproven reliability instead of a demonstrated multi-decade record and a reliability or overlay-drift problem discovered in year 8 or 10 is far more costly than it would appear under a 5-year depreciation lens. Second, this reframes the price comparison itself: if a 5-year accounting life dramatically understates a real 15-20 year service life, the effective annualized cost of the “expensive” ASML machine amortizes the $45 million down to roughly $9 million per year which is trivial next to the $322 million annual uptime penalty and the additional yield losses stacked on top. Viewed this way, ASML’s machine was never really the expensive option. Spread over its true operating life, its annualized cost is a tiny fraction of the annual revenue penalty the free Chinese machine would impose. The fab isn’t choosing between cheap and expensive but rather it is choosing between a $9 million a year tool and a $322 million a year loss revenue.

A further point often lost in coverage of this development is that the domestic machine entering production is not actually competing against ASML’s current product line at all because ASML does not sell that class of machine to China anymore. The domestic tool is being compared, implicitly, to a 1950i-class design from around 2008. ASML’s actual recent shipments to China have consisted of newer-generation immersion DUV tools such as the NXT:1980Fi (330 WPH, 38nm resolution, 2.5nm overlay), offering meaningfully higher throughput and tighter overlay than the 175 WPH, 2.5nm-overlay, 2008-vintage design the Chinese tool resembles. In other words, China’s new machine is not displacing a sale ASML would otherwise have made, because ASML was never going to sell a 2008-generation tool into that market in the current period regardless of whether a domestic alternative existed. The domestic tool is substituting for legacy capacity ASML has already been regulated out of supply, not winning business away from the machines ASML is actively selling.

The pace and scale of actual adoption so far leaves more to be desired given that reporting indicates the domestic tool is expected to ship in roughly 5 units this year, scaling to around 20 units next year with initial deliveries going to SMIC, Hua Hong and CXMT primarily for production-line validation rather than volume manufacturing. A separate domestic effort from Shanghai Micro Electronics Equipment has reportedly sold around 10 units of a comparable series to date. These are pilot scale deployments measured in single digit and low double digit unit counts, not a fleet level replacement of ASML’s installed base, which numbers in the thousands of systems globally. Industry analysis of similar transitions notes that moving a new lithography platform from early production into high volume fab use typically takes months to years, because uptime and yield can only be proven under sustained real world manufacturing conditions. Some reporting also indicates domestic tools still depend on imported components, including parts sourced from Japan, meaning full supply chain independence has not yet been achieved either.

Taken together, the numbers converge on a single, deliberately extreme conclusion: even setting the price of the Chinese machine to zero does not make it the rational choice over ASML’s machine at full price. An approximate $322 million/year in lost revenue as an uptime penalty alone dwarfs the entire $30-45 million purchase price of the ASML machine it would replace, meaning the “savings” from taking the free machine are wiped out roughly eight times over in the first year of operation alone. Layer on a likely larger yield-related loss from materially worse overlay (2.5nm on a 2008-era-comparable design, versus 1.4nm on ASML’s current lineup) and the case against the free machine only strengthens. A 5-year depreciation schedule that masks a real 15-20 year service life shrinks the effective annualized cost of the “expensive” ASML machine to roughly $9 million a year. The domestic tool is being measured against a machine class (NXT:1950i-era) that ASML no longer even sells to China, with shipment volumes of roughly 5 units in 2026 scaling to 20 in 2027 against an ASML installed base numbering in the thousands.

Every one of these facts points in the same direction. A rational fab operator, free from political pressure, does not compare a $30-45 million ASML machine against a free Chinese machine and conclude that free is the better deal. It compares an approximately $9 million annualized ASML cost against a $322-million-plus annual revenue penalty and concludes, correctly, that the free machine is by far the more expensive option on the table. The domestic Chinese DUV tool is a meaningful supply chain resilience milestone for China. But it is not an economically rational substitute for ASML’s machines at any price point, including zero, and it does not represent a material near-term threat to ASML’s revenue.

To conclude, these numbers point to a clear set of conditions China’s domestic lithography industry would need to satisfy before it could genuinely displace ASML in the Chinese market rather than merely supplement it at the margins.

First, the domestic tool would need to close the reliability gap entirely, moving from today’s roughly 90% uptime to something in the 95-96% range that ASML tools already deliver.

Secondly, it would need to match the yield fabs currently extract from ASML machines at the 28nm node yields that sit close to 100% for leading fabs like TSMC which is not the product of a single engineering breakthrough but of decades of accumulated trial and error over decades formatting the fab layout and process so that it can achieve the highest possible yield. If this new machine were to be implemented, the whole fab layout would have to be rerouted to suit the new machine which will incur unnecessary costs.

Third, even after closing both gaps, the domestic tool would still need to be priced significantly below ASML’s machines by enough to entice fab operators to walk away from a platform with roughly 30 years of DUV history and an unmatched track record of compounding reliability, process stability and yield performance. This is a switching decision few rational operators make lightly even when the economics look close, let alone when a new, unproven entrant is asking them to bet a fab’s output on it.

Each of these three conditions is individually difficult. Achieving all three simultaneously:matching uptime, matching yield built on decades of accumulated learning and still undercutting ASML on price by enough to justify the switching risk would be a genuinely remarkable feat and one with no real precedent in the history of the lithography industry. Given the scale of the gap on each dimension individually and the fact that all three must be closed at once rather than one at a time, it would be a considerable surprise if China’s domestic DUV effort managed to clear all three bars in the foreseeable future. Until it does, the domestic tool remains a supply-chain resilience achievement rather than a genuine competitive threat to ASML’s position in China.