Behind ASML's Volatility: The Reality and Significance of China's Immersion DUV Lithography

Recently, tech circles have been buzzing with the headline: "Chinese lithography machines achieve mass production." Taken at face value, this might create the illusion that pure domestic 7nm smartphones are imminent. However, when we strip away emotional filters and return to reports from sources like Reuters in late July 2026, the picture becomes clearer and more profound.

According to reports, a state-owned Chinese semiconductor equipment manufacturer has initiated production of its self-developed immersion Deep Ultraviolet (DUV) lithography machine. The first batch of equipment is expected to be delivered within the year to leading foundries such as SMIC (Semiconductor Manufacturing International Corporation), Huahong Group, and Changxin Memory Technologies (CXMT). In industrial terms, this "production" is more accurately defined as "small-batch commercial validation" rather than the million-unit "mass production" seen in consumer goods. This means the machine is no longer a fragile "prototype" cared for in a laboratory; it has entered the fab, ready to operate continuously on production lines characterized by noise, vibration, and stringent environmental requirements. For the general public, this signals that China's chip manufacturing, on its path to reducing reliance on US technology, has crossed the most difficult "zero-to-one" commercial threshold. The signal that it is "usable" and that customers are "willing to use it" is more important than any specification sheet.

Why the Focus on "Immersion" Technology?

To understand the significance of this breakthrough, one must first understand what "immersion DUV" is. In chip manufacturing, the lithography machine acts like an ultra-fine pen. "Immersion" technology involves placing a layer of high-purity deionized water between the lens and the silicon wafer, using the refractive index of water to improve resolution.

This is a critical node for manufacturing logic and memory chips at process nodes of 28nm and below.

Previously, domestic companies had accumulated experience with dry DUV technology, but immersion involves extremely complex optical lens groups, dual-workpiece stage synchronization control, and light source stability. Any minor jitter in a subsystem could lead to the scrapping of an entire batch of wafers. In my view, the core value of this development lies not in a single-point technical breakthrough, but in the maturity of system integration. A lithography machine contains tens of thousands of components; making them work together with nanometer-level precision is the "crown jewel" of industry. The ability to deliver to top-tier clients like SMIC indicates that its Mean Time Between Failures (MTBF) and production line yield have reached the baseline for commercial entry.

Not a Solo Breakthrough, but a Supply Chain Collective Effort

Many tend to view lithography machines as the victory of a single company, but in reality, they are a projection of a nation's entire industrial foundational capability. The ability to achieve small-batch production relies on the coordinated localization of key subsystems. We need to pay attention to several behind-the-scenes heroes: RSLaser's excimer laser light sources, Guowang Optics' precision optical components, and Hwa Jing Precision's dual-workpiece stages. In the past, these links were often choke points subject to external restrictions. Today, they have transitioned from "usable" to "reliable," supporting the batch assembly capabilities of the original equipment manufacturers (OEMs).

This change is directly reflected in market sentiment. Influenced by this news, the stock price of ASML, the global lithography giant, saw a significant decline in late July 2026. Analysis points out that before large-scale substitution by domestic equipment, ASML's revenue share in the Chinese market had already dropped from 33% to 16%. Investors are re-evaluating the speed of substitution by China's local supply chain. It is worth noting that this should not be interpreted as a "collapse" of ASML, but rather a rational correction of market expectations regarding its long-term growth. For the Chinese industry, gaining market share is just the beginning; ensuring the stability of equipment under 24/7 high-intensity operation is the real test ahead.

Gaps Remain: Maintaining Clear-headed Long-termism

While achieving mass production of immersion DUV is a major breakthrough, we must objectively acknowledge that there is still a clear generational gap compared to ASML's most advanced EUV (Extreme Ultraviolet) lithography machines. Current domestic equipment mainly meets the needs for mature processes (28nm-14nm) and partial advanced process de-Americanization, while the path remains long for the most cutting-edge fields below 7nm.

One perspective is that we do not need to surpass competitors in all tracks immediately, but rather secure our base first. For most IoT chips, automotive electronics, and power management chips, mature processes of 28nm-14nm are already sufficient. The breakthrough in domestic lithography primarily solves the issue of "availability," safeguarding the security baseline of national information infrastructure. The next key step is not merely pursuing paper-leading specifications, but improving equipment reliability and ecosystem compatibility. If we can gradually improve yields and reduce costs on this basis, China's semiconductor industry will shift from "passive defense" to "active competition."

Key Takeaway: Domestic lithography machines have entered the stage of small-batch commercial delivery, marking the maturity of supply chain coordination rather than a signal of comprehensive superiority. Viewing the gap rationally and focusing on autonomous control of mature processes is the most pragmatic industrial path at present.