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The focus ring is one of the most consequential consumables in a Tokyo Electron (TEL) 300 mm plasma etch chamber. Designated by OEM part number 2L10-252181-11 and supplied by ESCT Fab Support as ES7099-143, this annular component encircles the 300 mm wafer where it rests on the electrostatic chuck. It sits directly within the plasma sheath, framing the wafer edge and extending the electrical and physical boundary of the active etch field beyond the silicon. In doing so, it determines whether the outermost few millimetres of every wafer etch to the same profile and depth as the centre.
In a parallel-plate or capacitively coupled etch reactor, the wafer edge is a natural discontinuity: the RF field, ion trajectories and plasma density all want to behave differently where the conductive substrate ends. The focus ring exists to mask that discontinuity. By presenting a sacrificial surface at the same height and dielectric character as the wafer, it pushes the sheath boundary outward so the ion flux arriving at the wafer perimeter stays vertical and uniform rather than bending inward. The “LAB 360-310-5” descriptor in the raw part name reflects the ring geometry and dimensional family for this particular chamber generation.
Because the ring is plasma-facing and continuously bombarded by energetic ions, it is a true consumable. It erodes predictably over thousands of RF hours and is replaced on a planned preventive-maintenance interval. Keeping a qualified spare such as ES7099-143 on the shelf is therefore central to sustaining edge yield without unplanned tool downtime.
The focus ring performs several interdependent jobs at once, blending electrostatics, plasma physics and mechanical positioning into a single sacrificial part that frames the wafer edge throughout every process step.
A focus ring earns its place in the chamber through material behaviour under sustained plasma exposure. The right material chemistry and dimensional tolerance determine both how the ring shapes the etch field and how long it survives before its erosion shifts edge results out of specification.
Focus rings for silicon and dielectric etch processes are typically manufactured from high-purity silicon, silicon carbide or quartz, selected so the ring erodes cleanly without releasing metallic or particulate contamination onto the wafer. The material must withstand continuous ion bombardment, fluorine- and chlorine-bearing chemistries and high RF power densities while eroding at a slow, predictable rate. A uniform, low-contaminant erosion signature is what allows the ring to be tracked confidently against a defined RF-hour replacement limit.
The ring’s inner diameter, height, flatness and surface finish are held to tight tolerances because they directly set the sheath geometry at the wafer edge. Even small departures in step height between the ring top surface and the wafer plane alter the local ion angle and etch rate. A correctly machined and finished ring sits flush on the chuck, couples consistently to the RF field, and reproduces edge results from chamber to chamber across a matched fleet.
Because the focus ring controls the most yield-sensitive zone of the wafer, its condition propagates directly into process and fab economics. A worn or mismatched ring rarely fails dramatically; instead it quietly drags edge results until die loss becomes visible at probe.
The dominant wear mode is gradual erosion of the ring top surface under ion bombardment. As material is removed, the step height relative to the wafer falls, the sheath geometry at the edge shifts, and edge etch rate and profile drift away from the qualified recipe window. This wear is expected and is the primary driver of the planned replacement interval.
Repeated thermal cycling, mechanical handling during wafer transfer or clamping, and stress concentrations can crack or chip a ceramic or silicon ring. A fractured ring loses its sheath-shaping function locally, may move out of position, and becomes a major particle source that can contaminate subsequent wafers.
Process by-products and polymer deposit on the ring over a campaign. If deposition becomes thick or non-uniform, or flakes during cycling, it generates particles and alters the local electrical environment. Beyond a point, accumulation cannot be recovered by cleaning and the ring must be replaced to restore stable performance.
Focus ring replacement is a routine preventive-maintenance task, but it is also a contamination-sensitive operation performed close to the electrostatic chuck. Follow the TEL maintenance procedure for the specific platform; the sequence below outlines the typical steps.
Focus rings are scheduled consumables, so their supply should be managed as planned inventory rather than reactive purchasing. ESCT Fab Support helps fabs maintain etch availability with qualified, cost-effective alternatives to single-source OEM procurement.
It encircles the 300 mm wafer and extends the plasma sheath beyond the wafer edge, keeping ion bombardment vertical and uniform at the perimeter so the outer die etch to the same profile and depth as the centre.
No. ES7099-143 is supplied as a new, second-source part that is OEM-compatible and verified to the form, fit and function of TEL OEM P/N 2L10-252181-11. It is not an original OEM-branded component.
Replacement is driven by accumulated RF hours and process recipe, since the ring erodes steadily in use. Most fabs replace it on a defined preventive-maintenance interval; the exact limit is set by your edge-uniformity and particle qualification data.
Common indicators are drifting edge etch rate or critical dimensions, narrowing usable edge exclusion, rising particle or defect counts at inspection, and visible erosion or height loss when the chamber is opened for PM.
The typical lead time is 4–5 weeks. Because the focus ring is a planned consumable, we recommend holding buffer stock and ordering against your forecast PM schedule to avoid tool downtime.
The part is verified to the dimensional and functional characteristics of the referenced TEL OEM ring, so it is intended to seat and perform like the part it replaces. As with any consumable change, qualify it with monitor wafers and confirm edge uniformity before returning the chamber to production.
The focus ring referenced by TEL OEM P/N 2L10-252181-11 and supplied as ESCT P/N ES7099-143 is a plasma-facing sacrificial consumable that governs edge etch uniformity in TEL 300 mm etch chambers. By extending the plasma sheath beyond the wafer and shaping the field at the perimeter, it protects the outermost die and the chuck hardware beneath it. As a part that erodes predictably under ion bombardment, it is a planned replacement item, and keeping a qualified, competitively priced spare on hand directly protects edge yield and tool availability.
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 2L10-252181-11. 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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