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The TEL focus ring identified by OEM part number 2L10-252110-11 is a circular consumable component that sits at the outer edge of the electrostatic chuck inside a Tokyo Electron 300 mm plasma etch chamber. Its designation in the original parts catalogue, “RING, FOCUS LAB 360-306-5”, marks it out as a focus ring, one of the most heavily worked sacrificial parts in any high-density plasma etcher. Where the wafer sits on the chuck, the focus ring encircles it, bridging the abrupt geometric and electrical discontinuity that would otherwise exist at the wafer perimeter.
In a 300 mm etch process the last few millimetres of the wafer edge are the hardest area to control. Plasma sheaths bend, ion trajectories tilt, and the local electric field collapses where the conductive wafer surface ends. The focus ring extends the effective process surface beyond the wafer, pulling the plasma sheath outward so that the sheath boundary remains flat and parallel across the entire wafer rather than curling down at the edge. By doing so it preserves vertical ion incidence at the outermost dies, which is precisely the region where edge exclusion, tilt and critical-dimension drift erode usable yield.
Because the focus ring is directly exposed to the plasma and to continuous ion bombardment, it erodes over time and is treated as a scheduled consumable. Its dimensional stability, material purity and electrical behaviour all feed directly into edge etch uniformity, particle performance and chamber-to-chamber matching, making timely, qualified replacement a core element of any TEL etch maintenance programme.
The focus ring is far more than a mechanical spacer around the wafer. It is an active participant in shaping the plasma sheath and steering the etch chemistry at the wafer edge, and its condition determines how repeatably the chamber can place identical features across the full 300 mm field.
Focus rings for TEL 300 mm etchers are produced from high-purity process materials selected for their behaviour in aggressive fluorine- and chlorine-based chemistries. The choice of material directly governs erosion rate, particle generation and the rate at which the ring’s profile changes through its service life.
A focus ring only performs correctly when its height, flatness and inner-diameter relationship to the wafer edge are held to tight tolerances. These dimensions set the sheath geometry and the electrical coupling at the edge, so even small departures shift the edge etch result.
Because it governs the most sensitive region of the wafer, the focus ring’s condition shows up directly in edge yield, defectivity and tool uptime. A worn or out-of-spec ring is one of the most common root causes of edge-band excursions in plasma etch.
The dominant failure mode is gradual erosion of the top surface under sustained ion bombardment. As the ring loses height, the plasma sheath at the wafer edge drops and bends, ion trajectories begin to tilt and edge critical dimensions drift. Once the ring falls below its minimum usable height the edge process can no longer be held in specification and replacement becomes mandatory.
Thermal cycling between idle and high-power process conditions, combined with non-uniform clamping or handling shock, can introduce cracks, chips or pitting. Localised damage distorts the field at that azimuth, creating an asymmetric edge result, and any liberated fragments become a direct source of killer particle defects on the wafer.
Etch by-products and sputtered material redeposit on the ring surface during processing. As these films build up they can flake, shed particles and alter the surface chemistry and electrical behaviour of the ring. Heavy redeposition also accelerates apparent wear and can shorten the interval between chamber wet cleans.
Focus ring replacement is a routine preventive-maintenance task, but it must be carried out cleanly and precisely because the ring sits at the most contamination-sensitive point in the chamber. The following sequence reflects good general practice; always defer to your site’s TEL maintenance procedures and safety requirements.
Focus rings are predictable, scheduled consumables, which makes them ideal candidates for a planned second-source supply strategy. Carrying qualified stock removes the focus ring from the critical path of your preventive-maintenance schedule and protects against extended OEM lead times. ESCT Fab Support supplies this part, ES7099-137, with the following advantages.
It encircles the wafer on the electrostatic chuck and extends the process surface beyond the wafer edge. This keeps the plasma sheath flat and ion trajectories vertical at the outermost dies, which preserves edge etch uniformity and critical-dimension control where the process is most difficult to manage.
No. This is a new, second-source component that is OEM-compatible and verified to the form, fit and function of TEL OEM P/N 2L10-252110-11. It is not an original Tokyo Electron part and is supplied as a qualified alternative under ESCT P/N ES7099-137.
The usual indicators are loss of ring height beyond the tool’s minimum specification, drift in edge critical dimensions or etch rate, rising particle counts and visible erosion, pitting or cracking on inspection. Most fabs replace the ring on a wafer-count or RF-hours interval determined by their own qualification data.
The typical lead time is 4-5 weeks. Because focus rings are scheduled consumables with a fairly predictable replacement cadence, holding buffer stock against this lead time keeps the part off the critical path of your preventive-maintenance plan.
Yes. A worn or damaged ring bends the plasma sheath at the wafer edge, tilting etch profiles and widening the edge exclusion zone, which directly reduces the number of usable dies. Eroded or flaking rings are also a leading source of edge-band particle defects, so ring condition affects both yield and tool availability.
In most production environments, yes. After fitting a new ring it is normal to season the chamber and run monitor wafers to confirm edge uniformity, particle performance and critical-dimension targets before returning the tool to production. Always follow your site’s TEL qualification procedure.
The TEL focus ring, OEM P/N 2L10-252110-11 and ESCT P/N ES7099-137, is a sacrificial edge-confinement consumable for Tokyo Electron 300 mm plasma etch chambers. By extending the process surface beyond the wafer perimeter it keeps the plasma sheath flat and ion trajectories vertical, protecting edge etch uniformity, critical-dimension control and particle performance. As a predictable, scheduled wear part it is an ideal candidate for planned second-source supply, and ESCT Fab Support offers it as a new, fit-and-function-verified alternative with a typical 4-5 week lead time to keep your etch PM programme on schedule.
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 2L10-252110-11. 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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