ASML has categorically denied shipping any EUV (extreme ultraviolet) lithography system — or components specifically designed for one — to China, after US Secretary of Commerce Howard Lutnick reportedly raised concerns that such technology may have reached the country. The episode, while widely ridiculed by industry observers, cuts to a deeper and more consequential question: with EUV firmly out of reach and access to advanced DUV (deep ultraviolet) tools tightening, how far can Chinese chipmakers realistically go?

Why the rumour was met with ridicule

The logistics alone make an illicit EUV transfer almost impossible to conceal. A single ASML EUV lithography system weighs approximately 180 tonnes, comprises a vast number of precision components, and is typically transported in the cargo holds of large freight aircraft. Installation, calibration, and ongoing service support require teams of specialists — making any covert shipment extraordinarily difficult to execute without detection.

That context is why Secretary Lutnick's reported concern was greeted with scepticism, and in some quarters outright mockery, by semiconductor industry analysts and observers. ASML, headquartered in the Netherlands, has maintained strict compliance with export control regimes that bar it from selling EUV systems to Chinese customers.

The real bottleneck: lithography access

Despite the implausibility of the rumour, the broader issue it surfaces is entirely real. Lithography — the process of etching circuit patterns onto silicon — remains one of the most critical chokepoints in China's semiconductor ambitions. Semiconductor Manufacturing International Corporation (SMIC) and other domestic foundries are attempting to push DUV multi-patterning techniques further than previously thought viable, compensating for the absence of EUV by layering multiple exposure steps.

At the same time, domestic tool makers are working to develop indigenous lithography systems, though these remain well behind the capabilities of ASML and Japan's Nikon. Export controls have also progressively tightened around advanced DUV equipment, narrowing the workaround options available to Chinese fabs.

Alternative paths and their limits

China's chip industry is exploring several parallel strategies to navigate the restrictions. Advanced packaging — stacking and interconnecting chips to boost system-level performance without requiring the most advanced nodes — has gained traction. Huawei Technologies has also been developing its own framework, referred to as Tau Law, as a system-level optimisation approach aimed at extracting greater efficiency from existing process nodes.

Kirin chipsets, produced in partnership with SMIC, have demonstrated that DUV-based multi-patterning can yield competitive results at certain nodes — but analysts, including those at SemiAnalysis, note the yield costs and complexity involved make scaling these approaches economically challenging. TSMC and Samsung Electronics, by contrast, continue to advance on EUV-enabled nodes that remain inaccessible to their Chinese counterparts.

What's next

The ASML denial may close this particular chapter, but the structural tension it highlights will not dissipate. As US export controls evolve and domestic Chinese alternatives remain years behind the frontier, the lithography gap is likely to widen before it narrows. Watch for further tightening of DUV equipment rules and the pace of China's domestic lithography development as the key indicators of how this constraint plays out.