CX10-350909-11
WAFER, TEACHING TACTRAS

Teaching wafer (OEM P/N CX10-350909-11), robot calibration and position-teaching aid for Tokyo Electron TACTRAS etch systems

Precision teaching wafer for handler and end-effector setup on TEL TACTRAS 300 mm plasma etch platforms

The Teaching Wafer, OEM part number CX10-350909-11, is a precision setup and calibration aid used during installation, requalification and maintenance of Tokyo Electron (TEL) TACTRAS 300 mm plasma etch systems. Unlike the focus rings, edge rings and silicon electrode parts that live inside the process chamber, a teaching wafer never sees plasma during production. It is a service-floor tool: a dimensionally controlled 300 mm disc, often instrumented or precisely indexed, that engineers use to teach the transfer robot, atmospheric and vacuum handlers, aligners and chamber lift pins exactly where a wafer should sit at every handoff in the tool.

In a high-throughput etch cluster, dozens of mechanical handoffs occur for every production wafer, from the front-opening unified pod (FOUP) load port, through the equipment front-end module (EFEM), across the loadlock, into the transfer module and finally onto the electrostatic chuck (ESC) of each process chamber. Each of those positions has a taught coordinate stored in the tool controller. The teaching wafer is the physical reference against which those coordinates are established and verified, so that the production wafer arrives centred, flat and repeatably placed on the chuck.

Because it sets the geometric baseline for the entire wafer path, a correctly specified teaching wafer is fundamental to particle performance, placement repeatability and chamber-to-chamber matching on a TACTRAS platform. A mis-taught position can shift a wafer by fractions of a millimetre on the chuck, which is enough to degrade edge etch uniformity, disturb backside helium sealing, or cause the wafer to clip a focus ring or lift-pin during transfer.

Functional role of the teaching wafer in Tokyo Electron TACTRAS platforms

The teaching wafer serves as the master geometric reference for every station a wafer touches inside the tool. Its job is to let service engineers establish and confirm the handoff coordinates that the tool then trusts for the life of the configuration. Typical functions include:

• Teaching atmospheric and vacuum transfer robot pick and place positions at each load port, aligner, loadlock and process chamber.
• Establishing wafer centring on the electrostatic chuck so the wafer sits concentric with the focus ring and confinement hardware.
• Verifying lift-pin and end-effector handoff heights to prevent scraping, tilting or dropped-wafer events.
• Calibrating the pre-aligner notch-find and centring optics against a known, true-round reference disc.
• Supporting chamber-to-chamber and tool-to-tool matching during installation, requalification and after major maintenance.
• Providing a non-product disc for dry-cycling the handler to confirm placement repeatability before production wafers are loaded.

Material and process performance

A teaching wafer must reproduce the mechanical envelope of a production 300 mm wafer with very tight tolerance, because every coordinate it sets is referenced from its edge, notch and surface. Its value lies not in plasma resistance but in dimensional fidelity, flatness and handling neutrality.

Dimensional and flatness characteristics

The disc is manufactured to the SEMI-standard 300 mm outline (diameter, edge profile and notch geometry) with controlled total thickness variation and bow so that the aligner and robot read it exactly as they would a process wafer.

• True-round 300 mm diameter and standard notch for accurate aligner centring and orientation.
• Low bow and warp so taught Z-heights remain valid across the wafer face.
• Stable, machined edge profile that the end-effector and edge-grip sensors register consistently.

Sensing and handling behaviour

Depending on the variant, the teaching wafer may be a passive precision disc or an instrumented type carrying targets or sensors; in all cases it is selected so that mapping sensors, optical centring and any backside detection behave as they would for production silicon.

• Surface finish and edge optics compatible with the EFEM mapping and aligner sensors.
• Clean, low-outgassing construction suitable for entry into the vacuum transfer module.
• Handling-neutral mass and stiffness so robot motion profiles match those used for product wafers.

Impact on tool performance and yield

Although it is a service consumable rather than a process part, the teaching wafer sets the baseline that determines whether every production wafer is correctly placed. Errors introduced at teaching propagate into every wafer the tool subsequently runs:

• Accurate wafer centring on the chuck preserves edge etch uniformity and consistent focus-ring coupling.
• Correct handoff heights prevent backside scratches, particle generation and dropped-wafer crashes.
• Repeatable placement supports stable backside helium cooling and clamping at the ESC.
• Good teaching underpins chamber-to-chamber matching and shortens tool qualification time.
• Reliable transfer reduces unplanned downtime, wafer scrap and the cost of crash recovery.

Common wear and failure modes

Edge and surface damage

Repeated handling, edge gripping and accidental contact can chip or nick the edge or scratch the surface. Because the aligner and robot reference the edge and notch, any localised damage corrupts the very coordinates the wafer is meant to set, so a marked disc should be retired rather than trusted.

Warp and dimensional drift

Mishandling, thermal exposure or long-term storage stress can introduce bow or flatness drift. A warped teaching wafer leads to incorrect Z-height teaching and inconsistent placement, undermining the matching it was supposed to guarantee.

Contamination

A teaching wafer that picks up particles or residue can deposit contamination at the chuck and across the transfer path, and can also be misread by mapping and centring sensors. Dirty or fingerprinted discs should be cleaned to specification or replaced before use in the vacuum environment.

Installation and replacement guidance

A teaching wafer is used during scheduled teaching and verification procedures by qualified service personnel following TEL guidelines. A typical sequence is:

• Confirm the tool is in the correct maintenance or teach mode with handlers under manual or jog control.
• Inspect the teaching wafer for edge chips, surface marks, warp and cleanliness before use.
• Load the disc with clean, gloved handling or approved tooling and run the pre-aligner to establish centring and notch orientation.
• Teach and verify each handoff in sequence, load port, EFEM, loadlock, transfer module and each process chamber chuck and lift-pin position.
• Dry-cycle the handler repeatedly to confirm placement repeatability and absence of scraping or tilt.
• Record the taught coordinates and run any required placement or particle verification before returning to production.
• Clean the teaching wafer and return it to protective storage so it remains a reliable master reference.

Spare parts strategy for Tokyo Electron TACTRAS fleets

Keeping a qualified teaching wafer on hand means a tool can be re-taught immediately after a robot crash, handler replacement or major maintenance, rather than waiting on a single shared reference disc. ESCT Fab Support helps fabs manage these setup consumables alongside chamber parts:

• Second-source new parts verified to the form, fit and function of OEM P/N CX10-350909-11.
• Dimensionally controlled construction so taught coordinates match those set with the original reference.
• Support for fleet-wide standardisation, helping keep teaching consistent across multiple TACTRAS tools.
• Competitive cost of ownership compared with sole-sourced setup hardware.
• A typical lead time of 4-5 weeks to support planned maintenance and spares replenishment.
• Application support to confirm suitability for your specific tool and handler configuration.

Frequently asked questions

What is a teaching wafer used for on a TACTRAS etch system?

It is a precision 300 mm reference disc used to teach and verify the positions where the transfer robot, aligner and handlers pick, place and seat a wafer throughout the tool, including centring on the electrostatic chuck. It is a setup and maintenance aid, not a production wafer or a plasma-exposed chamber part.

Is this an original Tokyo Electron OEM part?

No. This item is supplied as a second-source, new part that is verified to the form, fit and function of OEM P/N CX10-350909-11. It is not an original OEM-branded component and is offered as a compatible alternative for maintenance and spares.

Does the teaching wafer go into the plasma chamber during production?

No. It is used during teaching, calibration and verification only. It may be cycled through the transfer path and onto the chuck to confirm placement, but it is not part of a production etch process and is not subjected to plasma processing.

How often should a teaching wafer be used or replaced?

It is used whenever handoffs must be taught or reverified, typically at installation, after robot or handler service, following a wafer crash, or during requalification. The wafer itself should be replaced once it shows edge chips, scratches, warp or contamination that could compromise its accuracy as a reference.

Why does accurate teaching matter for etch uniformity?

If a wafer is not centred correctly on the chuck, it sits eccentric to the focus ring and confinement hardware, which can disturb edge etch uniformity and backside cooling. Teaching with a true-dimension reference disc keeps placement repeatable so each production wafer couples to the chamber the same way.

What is the lead time for this part?

The typical lead time is 4-5 weeks. We recommend holding a qualified teaching wafer in your maintenance spares so position teaching can proceed without delay after handler service or a transfer fault.

Summary

The Teaching Wafer, OEM P/N CX10-350909-11, is a precision setup and calibration disc for Tokyo Electron TACTRAS 300 mm plasma etch systems. It provides the geometric master reference used to teach and verify robot, aligner and handler positions across the wafer path, so wafers are centred and seated repeatably on the electrostatic chuck. Though it never processes a production wafer, the accuracy it establishes directly underpins placement repeatability, particle performance, edge uniformity and chamber-to-chamber matching. Supplied as a dimensionally controlled second-source new part with a typical 4-5 week lead time, it is a practical, cost-effective addition to any TACTRAS maintenance spares inventory.

Disclaimer: This part is supplied by ESCT Fab Support as a new, OEM-compatible second-source component, verified to the form, fit and function of the original equipment manufacturer part number CX10-350909-11. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with the original equipment manufacturer, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.

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