KLA
8250 CD-SEM
Provisional entry — research in progress
This page was generated automatically from cited public sources and hasn't completed the full research pass yet. Every specification shown carries its source; more detail is added as research completes.
The KLA 8250 CD-SEM is a critical dimension scanning electron microscope (CD-SEM) for e-beam metrology, used to measure and image semiconductor wafer features. The KLA 8250 CD-SEM achieves a resolution below 4 nm and handles feature sizes below 30 nm. The KLA 8250 CD-SEM supports wafer sizes from 3 to 8 inches and can accommodate substrates such as Si, GaAs, SiC, InP, and sapphire.[1]
What it is
The KLA 8250 CD-SEM supports wafer sizes from 3 to 8 inches. The instrument uses a Schottky thermal field emitter as its electron source. The system has a resolution of less than 4 nanometers and a feature size capability of less than 30 nanometers. Accelerating voltage ranges from 0.4 to 1.5 kV. Magnification covers a range of 2.34 kX to 400 kX. The stage provides a position accuracy of less than 1 micrometer with laser guidance. Throughput is up to 55 wafers per hour.[1][2]
How it works
General reference — not yet source-verifiedA CD-SEM operates by focusing a narrow electron beam onto the wafer surface and scanning it in a raster pattern. Secondary electrons emitted from the surface are collected to form an image from which critical dimensions are measured. The instrument must maintain a high vacuum environment to allow unimpeded electron travel.
Where it fits in the process flow
General reference — not yet source-verifiedCD-SEMs are used in semiconductor fabrication after photolithography and etch steps to measure the critical dimensions of features. Measurements provide feedback for process control and ensure pattern fidelity. The tool typically operates in a cleanroom environment and may be part of an automated metrology loop.
What do the numbers mean?
Power & electrical3
Wafer handling7
Optics & imaging4
Control & software2
Dimensions & facilities1
Configuration & options4
What does it need to run?
Site utility requirements, footprint, and infrastructure needed to install and operate this tool. Sourced from public records.
Where are the manuals?
Generated from public-source data on file. Enter your email to access — nothing is published; details are routed privately.
Not publicly documented
Field notes
No research found yet — worked with this tool? Share what you know.
Frequently asked questions
How does a CD-SEM differ from a standard SEM?General reference — not yet source-verified
While both use electron microscopy, a CD-SEM is optimized for automated, precise dimensional measurement with specialized algorithms and drift compensation, and is integrated into fab automation.
What is the typical resolution of a CD-SEM?General reference — not yet source-verified
CD-SEMs achieve high resolution suitable for advanced semiconductor nodes, enabling measurement of very small features. The exact resolution depends on the specific model and operating conditions.
Are CD-SEMs non-destructive?General reference — not yet source-verified
Yes, they are typically non-destructive, using low beam currents and energies to minimize sample damage, which allows for in-line monitoring of production wafers.
Not publicly documented
The following facts about the 8250 CD-SEM are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.
No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the 8250 CD-SEM are on record.
Answerable by: OEM historical records or a trade-press announcement
No publicly documented variants, configuration options, or revision breakpoints of the 8250 CD-SEM are on record.
Answerable by: an OEM product catalog or an engineer who ordered or specified the tool
The control-system platform and OS era of the 8250 CD-SEM are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the 8250 CD-SEM are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the 8250 CD-SEM is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No research found yet — worked with this tool? Share what you know.
Sources & citations
Sources (3)Every fact above is drawn from these public sources
- [1]gcemarket.com — gcemarket.comgcemarket.com
- [2]wotol.com — wotol.comwotol.com
- [3]Equipment inventory listing
Last updated Oct 7, 2026.
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