Why ASML’s YieldStar 385H optical metrology tool matters for chipmakers
Published on 06/18/2026 at 08:09 | Editorial responsibility: Rafael MĂĽller, Editor-in-Chief AD HOC NEWS
Reviewed: ad hoc news Software & Services desk. Edited and checked on 2026-06-18, 08:08. Details in the imprint.
When ASML’s YieldStar 385H hums away in a cleanroom, no one outside the fab notices - but this optical metrology system quietly decides whether a cutting-edge chip design can ship in millions without nasty surprises on the wafer.
Background on the ASML Holding N.V. stock
The YieldStar 385H sits in the shadow of ASML’s giant EUV scanners, but for investors it is part of a growing software-and-services style revenue stream built around process control.
What the YieldStar 385H actually does
On the surface, YieldStar 385H looks like another white cabinet on the fab floor, but it is a high-throughput optical metrology tool that measures critical dimensions and overlay on patterned wafers to nanometer precision.
Instead of inspecting every transistor, the system shoots structured light patterns at carefully chosen test structures and analyzes the diffraction signatures to infer whether the lithography step hit the intended target.
Why chipmakers care about this box
At advanced nodes, a few nanometers of overlay error can make entire lots unusable, so fabs use YieldStar data to tweak scanner settings and keep processes inside extremely tight process windows.
The system ties into ASML’s holistic lithography ecosystem, feeding corrections back into TWINSCAN scanners and computational lithography software so that each subsequent wafer step is slightly better aligned than the last.
Speed, accuracy and integration
ASML specifies YieldStar 385H with high throughput so fabs can run frequent in-line measurements without choking production, an important point when EUV and high-NA tools cost millions per week simply to stand idle.
Because the metrology platform shares interfaces and automation concepts with ASML scanners, chipmakers can integrate it into existing wafer-handling flows rather than building bespoke links or extra robots for every tool.
Where the limitations show up
Optical metrology like YieldStar 385H is incredibly fast and non-destructive, but it still samples rather than measures every feature, so fabs have to choose representative test structures and accept some residual statistical uncertainty.
For very small or buried features, fabs may still complement optical tools with slower electron-beam metrology, trading off speed for ultimate resolution in process development and failure analysis.
Context for ASML and its stock
YieldStar 385H is one of several metrology and inspection platforms that help ASML broaden its revenue beyond pure lithography hardware into more software-like, service-heavy process control offerings.
Shares of ASML Holding N.V. (NL0010273215) trade on Euronext Amsterdam, where the company is a key barometer for global demand in advanced chipmaking equipment.
Key facts on ASML’s YieldStar 385H
- Product: YieldStar 385H
- Manufacturer: ASML Holding N.V.
- Category: Software/Service/Subscription - process control and metrology system
- Launch: Not publicly specified by year
- RRP / Price: Not publicly disclosed
- Availability: Sold directly by ASML to semiconductor manufacturers worldwide
- Target group: Advanced semiconductor fabs running leading-edge or high-volume production
- Highlight / USP: High-throughput in-line optical metrology tightly integrated with ASML lithography systems
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