Explain It in 30 Seconds
Many chip layers do not need EUV or immersion. A reliable dry scanner can print the required structures at an attractive cost and remain useful for a long time.
Dry lithography is a family of tools, not a single obsolete model. Different light sources, wafer formats and imaging capabilities serve different production needs.
ArF uses 193 nm light and KrF 248 nm. The 365 nm i-line category sits in the wider dry portfolio but should not be mistaken for another DUV laser wavelength. [S1][S15]
Where It Sits in ASML
Dry systems form the less demanding exposure layer beside immersion and EUV. They serve mature-node production and appropriate layers within more advanced processes.
They also connect with refurbishment, upgrades and customer support. A machine can remain economically useful after it no longer represents the leading edge of semiconductor scaling.
That long lifecycle changes the customer decision. Compatibility, parts and predictable operation may matter more than owning the newest platform.
The Problem It Solves
A fab must allocate expensive equipment to the work that actually requires it. Using a frontier scanner on a relatively simple layer can waste capital and operating capacity.
Dry tools offer a more proportionate solution for suitable features. Their value depends on producing acceptable results consistently, not on matching EUV's smallest possible pattern.
This is important in specialty and mature manufacturing, where customers may optimize for reliability, process compatibility and cost rather than maximum transistor density.
How It Works — Simple Version
A light source illuminates a mask, projection optics form the image, and the scanner exposes resist on a wafer. The dry approach lacks the water layer used by immersion systems.
Different product families use different wavelengths and optical designs. Wafer handling, alignment and control software coordinate the repeated exposure process.
After development, other manufacturing operations turn the resist pattern into the desired structure. The scanner performs one important step, not the complete chip-manufacturing sequence.
Why Older Technology Can Remain the Right Choice
A layer's requirements are specific. Its feature size, topography, alignment tolerance and production economics determine which tool is suitable.
A dry scanner may already have a qualified recipe and established support. Replacing it can create qualification costs without a corresponding improvement in sellable output.
That does not mean old equipment is always preferable. A newer dry platform can raise productivity or improve matching while preserving a suitable technology choice. The relevant comparison is useful output over the equipment's life.
Who Uses It?
Production users include semiconductor manufacturers running mature processes, specialty devices and less demanding layers. Equipment engineers, lithography specialists and manufacturing operators interact with the tools in different ways.
Customers may operate 200 mm or 300 mm production environments, depending on the process and equipment. A wafer-size label is not by itself a measure of chip quality or commercial value.
What It Depends On
Dry lithography needs masks, resist, stable illumination, accurate motion, alignment and maintenance. It also depends on a qualified process that fits the device.
An older tool can be constrained by parts availability or compatibility even when the underlying exposure technique remains useful. Support and refurbishment therefore matter to the product's practical lifetime.
The customer must also integrate the scanner with tracks, material handling and the rest of the production line.
What Depends on It?
A mature production process may be built around a specific equipment configuration. That creates dependence on stable recipes and service, not necessarily on the most advanced optical specification.
The range of applications is broader than leading-edge processors. Dry tools can contribute to memory, analog, power, automotive and other semiconductor production where the relevant layer fits their capabilities. [S15]
The important boundary is suitability: a broad application category does not mean every device in that category uses the same machine.
Product Economics
Customers consider purchase or refurbishment cost, throughput, availability, maintenance and process-change expense. Lower capital cost can be valuable, but an unreliable machine that interrupts the line may still be expensive.
A useful tool can have more than one ownership period. ASML participates in refurbishment and relocation, helping equipment move to another production role when appropriate. [S51][S57]
This creates a lifecycle business rather than a simple replacement cycle in which each new technology makes every older unit worthless.
Key Milestones
1980s–1990s — Early optical platforms
ASML's stepper development established the company before its later immersion and EUV programs. [S21]
2000s onward — More specialized portfolio roles
The spread of immersion and EUV changed which layers needed dry tools, without eliminating the category.
Continuing development — Productivity and application fit
Current ASML product information describes ongoing dry-platform development, including high-throughput ArF, KrF and i-line offerings. These are distinct products with different specifications, not a single interchangeable machine. [S15]
Why It Matters to ASML
The category broadens the company's customer relationships beyond the most advanced nodes. It also contributes to a long-lived installed base with service and upgrade needs.
It is a different competitive market from production EUV. Canon and Nikon participate in optical-lithography markets; ASML must offer useful performance, support and economics rather than rely on an EUV-only competitive description. [S58][S59]
What Most People Misunderstand
Dry means technically unimportant
A less demanding layer can still be essential to the finished device. The right tool is the one that meets its requirements economically.
Every dry tool is DUV
The wider portfolio includes i-line. Wavelength categories should not be collapsed.
A used machine has no productive value
Qualified refurbished systems can remain useful when their capability matches a customer's process.
Common Questions
Why not use EUV for every layer?
Some layers do not need it, and the total cost and process burden may not justify it.
Is dry lithography only for old chips?
No. Suitable layers of newer manufacturing processes can also use it.
Does a long machine life remove the need for service?
No. Maintenance, parts and calibration help preserve useful performance.