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The TEL focus ring designated 2L10-252671-11 is a precision annular consumable that sits in the wafer-edge region of a Tokyo Electron 300 mm plasma etch chamber. Identified internally by the descriptor “RING, FOCUS LAB 360-322-4.5”, it is the sacrificial ring that circumscribes the electrostatic chuck and the wafer it carries, sitting flush with, and immediately outboard of, the 300 mm substrate. In a plasma etch process, the wafer edge is the single most difficult zone to keep uniform, and the focus ring exists specifically to manage that boundary so that the outermost few millimetres of every wafer etch at the same rate, profile and selectivity as the centre.
Functionally, the focus ring extends the conductive (or dielectric) surface of the cathode beyond the physical edge of the wafer. This continuation keeps the plasma sheath flat and the electric field lines vertical across the wafer perimeter, instead of allowing them to curve downward at the chuck edge. Without that extension, ions arrive at the edge dies at an angle, etch features tilt, and a ring of out-of-spec die is lost on every wafer. The ring is therefore not a structural part but a process-critical electrical and geometric boundary condition.
Because it is directly exposed to the plasma and to continuous ion bombardment, the focus ring is a planned consumable. It erodes over thousands of RF hours, its thickness and inner profile change, and edge performance drifts until the ring is replaced. ESCT Fab Support stocks ES7099-212 as a second-source, form-fit-function alternative so fabs can hold the consumable against scheduled preventive maintenance without being constrained to a single supply channel.
In a TEL capacitively or inductively coupled etch chamber, the focus ring performs several interlinked jobs at once. It is simultaneously a plasma-shaping element, an RF boundary, a thermal buffer and a mechanical reference for wafer placement. Its specific contributions include:
Focus rings for 300 mm etch are manufactured from materials chosen to survive aggressive plasma chemistries while contributing the right electrical behaviour and the lowest possible particle burden. ES7099-212 is produced to the dimensional and material characteristics required by the TEL chamber it serves so that its plasma interaction matches the original consumable.
The ring must withstand reactive fluorine-, chlorine- or bromine-based chemistries and sustained ion bombardment without flaking, cracking or shedding particles. Material purity is critical because any metallic or mobile-ion contamination liberated from the ring travels straight to the wafer edge.
Inner diameter, height, step profile and flatness directly set the sheath shape at the wafer edge, so these dimensions are held tightly. Equally, the ring’s resistivity or dielectric constant determines how the RF field couples around the perimeter.
Because the focus ring governs the wafer-edge environment, its condition is felt directly in yield, particularly on the outermost die where modern fabs increasingly need every site to pass. A correctly specified, in-tolerance ring keeps the edge etching like the centre; a worn or mismatched one quietly erodes edge yield long before it triggers an alarm.
Continuous ion bombardment steadily sputters material from the ring’s upper and inner surfaces. As height drops and the inner step recedes, the sheath sags at the edge, ion angle drifts, and edge critical dimension and etch depth begin to move out of specification, the classic end-of-life signature that defines the replacement interval.
Thermal cycling, mechanical handling during PM, and clamping stresses can crack or chip the ring, especially once it has thinned. A fractured ring sheds particles directly onto the wafer edge and can disturb local field uniformity, making it a hard fail rather than a gradual drift.
Polymer and process by-products accumulate on the ring between cleans. Flaking deposits create particle adders, while uneven build-up or contamination can alter local impedance and, in severe cases, promote micro-arcing at the wafer edge that damages both the ring and the die.
Focus-ring replacement is a routine preventive-maintenance task, but because the part sits in the most contamination-sensitive zone of the chamber it must be handled cleanly and seated precisely. The following sequence reflects good practice; always follow your site’s TEL maintenance procedure and safety requirements.
Focus rings are high-frequency consumables, so securing a dependable, cost-effective supply is central to keeping TEL etch chambers running at target yield. ESCT Fab Support offers ES7099-212 as a second-source option that lets fabs diversify supply, control cost and protect uptime without compromising on conformity.
It surrounds the wafer at the edge of the electrostatic chuck and extends the cathode surface beyond the wafer perimeter. This keeps the plasma sheath flat and the ion trajectories vertical at the edge, so the outermost die etch with the same rate and profile as the wafer centre.
No. ES7099-212 is a second-source, new replacement part supplied by ESCT Fab Support. It is manufactured and verified to match the form, fit and function of TEL OEM P/N 2L10-252671-11, but it is not an original OEM-branded component and is offered as a compatible alternative.
Replacement is driven by accumulated RF hours and erosion rather than a fixed calendar. As the ring thins and its inner step recedes, edge etch performance drifts; most fabs schedule replacement at a defined RF-hour interval determined by their process and edge critical-dimension data.
A worn ring lets the sheath sag at the edge, which tilts ion incidence and pushes edge critical dimension and etch depth out of specification. The first symptom is usually lost yield on the outer ring of die, followed by rising particle counts if the ring begins to flake or crack.
Because ES7099-212 is held to the dimensional and electrical characteristics of the original consumable, it is intended to reproduce the same edge sheath behaviour. Following normal seasoning and qualification on installation, it supports consistent chamber-to-chamber matching for the same recipe.
The typical lead time is 4–5 weeks. Reorder against ESCT part number ES7099-212, referencing TEL OEM P/N 2L10-252671-11 if helpful, and consider holding buffer stock so the consumable is on hand for each scheduled preventive-maintenance window.
The TEL focus ring 2L10-252671-11, supplied by ESCT Fab Support as ES7099-212, is a process-critical edge consumable for Tokyo Electron 300 mm plasma etch chambers. By extending the cathode surface and shaping the plasma sheath beyond the wafer edge, it preserves vertical ion trajectories, edge etch uniformity and critical-dimension control on the outermost die. As a sacrificial part it erodes predictably and must be replaced on an RF-hour-driven schedule; a sound second-source supply lets fabs protect edge yield, manage consumable cost and keep chambers qualified. ES7099-212 is offered as a new, form-fit-function alternative with a typical 4–5 week lead time to support planned preventive maintenance.
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 2L10-252671-11. 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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