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The TEL Focus Ring 306-T6G50L (LAB/FLT variant) is a precision plasma-etch consumable that sits directly around the wafer in a Tokyo Electron 300 mm etch process chamber. Identified by OEM part number 2L10-252645-11 and supplied under ESCT part number ES7099-198, this component is one of the most consequential consumable rings in the chamber kit. Despite its simple annular geometry, the focus ring performs a demanding electrostatic and aerodynamic job: it extends the wafer-bias environment beyond the silicon edge so that the plasma sheath and the trajectory of incoming ions stay vertical and uniform all the way to the extreme outer die.
In a TEL etch chamber the focus ring is mounted concentrically on the electrostatic chuck (ESC) assembly, encircling the 300 mm wafer and bridging the gap between the wafer edge and the surrounding chamber hardware. Because it is consumed by direct ion bombardment and chemically aggressive plasma, the ring is a scheduled wear item. Its dimensions, surface profile and electrical characteristics are tightly controlled, since even small amounts of erosion shift the sheath shape over the wafer edge and degrade the etch result on the outermost rows of die, precisely the region where yield is most fragile.
As a high-turnover consumable, the focus ring directly influences edge etch uniformity, critical dimension (CD) control at the wafer perimeter, particle performance and the overall cost of ownership of the etch tool. Sourcing a dimensionally faithful, electrically matched replacement is therefore central to keeping a TEL etch chamber producing within specification.
The focus ring is the principal edge-confinement consumable in the chamber. By presenting a controlled surface and dielectric environment around the wafer, it makes the plasma “see” a larger effective wafer, pushing sheath non-uniformities and field fringing off the silicon and onto the sacrificial ring instead. Its functions in a TEL etch process chamber include the following.
Focus rings for TEL etch chambers are produced from plasma-grade materials selected for their erosion behaviour in fluorine- and oxygen-bearing chemistries, typically high-purity silicon, silicon carbide or quartz-class dielectrics depending on the process. The 306-T6G50L is built to the material specification appropriate to its process pocket, with controlled purity and grain structure so that it erodes predictably and slowly rather than spalling or generating particles. Material consistency batch-to-batch matters, because the etch rate of the ring itself must track the OEM part to preserve sheath geometry over a known consumable lifetime.
The electrical and aerodynamic behaviour of a focus ring is governed by its flatness (the “FLT” designation), inner and outer diameters, step height relative to the wafer surface and surface finish. The 306-T6G50L is machined and finished to tight tolerances so that the ring seats correctly on the chuck and presents the intended profile to the plasma. Deviations of only tens of microns in step height or flatness can measurably shift edge CD, which is why dimensional fidelity to the OEM drawing is treated as a primary acceptance criterion.
Because the focus ring controls the etch environment over the most yield-sensitive region of the wafer, its condition translates directly into measurable process and yield outcomes. A worn, mismatched or incorrectly seated ring produces effects that propagate straight to electrical test results.
The dominant failure mode is normal, expected erosion. Continuous ion bombardment thins the ring and lowers its step height relative to the wafer, gradually changing the sheath shape at the edge. As the ring approaches end of life, edge etch results drift out of specification and the ring must be replaced before edge yield degrades.
Thermal cycling and RF stress can initiate micro-cracks that propagate into chips or fractures, particularly in lower-grade or poorly matched material. Loose fragments and surface flaking become particle sources, contaminating the wafer edge and forcing unscheduled chamber cleans. A ring made to the correct material and finish specification resists this far longer.
A ring that is not seated flat and concentric on the chuck (whether from debris under the ring, handling damage or an out-of-tolerance part) disturbs both the RF return path and the local gas flow. The result is asymmetric edge etch and arcing risk. Careful handling and verified dimensions at installation prevent this avoidable failure.
Replacing a focus ring is a routine preventive-maintenance task, but it must be performed cleanly and precisely because the ring sits at the heart of the etch environment. The following sequence reflects good practice for TEL 300 mm etch chambers; always follow the applicable TEL maintenance procedure and your site safety rules.
Focus rings are consumed on a predictable schedule, so they belong in any well-planned spares inventory for TEL etch fleets. ESCT Fab Support supplies the 306-T6G50L (ES7099-198) as part of a broader TEL consumable strategy designed to keep chambers running and budgets under control.
It encircles the 300 mm wafer on the electrostatic chuck and extends the plasma sheath and RF field environment beyond the wafer edge. This keeps ion trajectories vertical and edge etch uniform, while acting as a sacrificial barrier that protects the chuck from direct ion bombardment.
No. This focus ring is supplied as a second-source, brand-new part that is verified to the original OEM form, fit and function. It is not an original Tokyo Electron OEM component and is offered as a compatible alternative referenced to OEM P/N 2L10-252645-11.
Replacement is usually driven by accumulated RF or process hours and by trends in edge CD, edge uniformity and particle data. As the ring erodes and its step height drops, edge results drift; most fabs replace the ring at a defined life limit before that drift affects yield.
It is manufactured from the plasma-grade material appropriate to its process pocket, high-purity silicon, silicon carbide or a quartz-class dielectric depending on the chemistry, with controlled purity, grain structure and finish so that its erosion behaviour matches the OEM part.
The typical lead time is 4-5 weeks. Because focus rings are consumed on a predictable PM schedule, we recommend holding buffer stock and ordering ahead of forecast demand to avoid any impact on chamber availability.
When the ring is built to the correct material, dimensional and flatness specifications, it is designed to behave like the OEM part across its life. As with any new consumable, we recommend a standard requalification after installation to confirm edge CD, uniformity and particle performance before returning the tool to production.
The TEL Focus Ring 306-T6G50L (OEM P/N 2L10-252645-11, ESCT P/N ES7099-198) is a critical edge-confinement consumable for Tokyo Electron 300 mm plasma etch chambers. By shaping the plasma sheath and RF field around the wafer edge, it protects the electrostatic chuck and governs edge etch uniformity, CD control and particle performance over the yield-sensitive perimeter of the wafer. Supplied as a second-source new part verified to OEM form, fit and function, with a typical 4-5 week lead time, it offers a cost-effective, dependable route to keeping TEL etch chambers within specification.
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 Tokyo Electron part number 2L10-252645-11. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Tokyo Electron, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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