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The 305-T5G50L LAB (FLT) focus ring is a precision-machined, plasma-facing consumable that surrounds the production wafer inside a Tokyo Electron (TEL) 300 mm plasma etch chamber. Identified by OEM part number 2L10-252644-11 and supplied by ESCT Fab Support under part number ES7099-197, it is one of the most consequential edge-process components in the chamber. Although it is a passive ring rather than an active assembly, its profile, dielectric properties and dimensional accuracy directly determine how the plasma sheath behaves over the outermost few millimetres of every wafer.
In a 300 mm etcher the wafer rests on an electrostatic chuck within a tightly engineered electrode stack. The focus ring sits concentrically around the wafer edge, bridging the abrupt transition between the silicon surface and the surrounding chamber hardware. The "FLT" flat-profile designation in the part name reflects a specific edge geometry tuned to a particular process recipe family, while "LAB" identifies the configuration variant. Because the ring is consumed by the same energetic ions and reactive radicals that etch the wafer, it is a scheduled replacement item with a finite, predictable service life.
Understanding what the focus ring does, how it erodes and when to replace it is central to sustaining edge yield. A worn or incorrectly specified ring will not stop the tool, but it will quietly degrade edge critical-dimension control, tilt etch profiles at the wafer periphery and elevate particle counts, problems that often surface only after good material has already been processed.
The focus ring extends the effective electrical and physical surface of the wafer outward, so that the plasma sheath remains flat and vertical right out to the wafer edge rather than curving downward into the chamber hardware. In doing so it performs several interlinked functions that are difficult to substitute with any other component:
Focus rings of this class are produced from high-purity materials chosen to balance erosion resistance, dielectric behaviour and freedom from metallic contamination. Common choices for TEL edge consumables include high-purity silicon, silicon carbide and quartz, each selected to match the chemistry and bias conditions of the target process. The material must erode predictably and cleanly: it should retain its profile for as long as possible, and when it does erode it must not shed metallic species or generate hard particles that land on the wafer. Purity has to be high because any trace metal liberated from the ring becomes a direct contamination source at the wafer edge.
The flat ("FLT") profile of this variant is not cosmetic; the inner diameter, step height, wall angle and overall flatness are engineering parameters that set the position and shape of the plasma sheath relative to the wafer edge. Tight tolerances on these surfaces are what allow a replacement ring to reproduce the established edge process without re-tuning the recipe. A part that is dimensionally faithful to the OEM drawing drops in and behaves like the ring it replaced; one that drifts even slightly will shift edge critical dimension and tilt.
Because the focus ring governs the electrical and physical environment over the wafer periphery, its condition is felt most strongly in the dies nearest the edge, precisely the region where yield is already hardest to hold. The cumulative effect of ring condition on the fab’s output is substantial:
The dominant wear mode is steady erosion of the upper surface and inner edge under ion bombardment. As the ring thins, the sheath drops relative to the wafer edge, ion trajectories begin to tilt and edge etch profiles lean outward. This is a gradual, expected process, which is why the ring is treated as a scheduled consumable with a defined wafer-count or RF-hour replacement interval rather than a run-to-failure part.
Thermal cycling, mechanical handling and an unevenly seated ring can all initiate cracks or chips, particularly once the part has thinned through use. Liberated fragments and flakes become particles that land on the wafer edge, and a cracked ring can also distort the local RF field. Any visible cracking, chipping or flaking is grounds for immediate replacement regardless of remaining nominal life.
Prolonged exposure roughens the ring surface and allows process by-products and polymer to accumulate. Roughened or fouled surfaces erode unevenly, create localised hot spots and can flake during subsequent runs. This wear mode is closely tied to the chamber clean schedule, and rings should be inspected for build-up at every preventive-maintenance interval.
Focus ring replacement is a routine preventive-maintenance task, but because the part sits directly in the wafer-edge process zone it must be handled and seated with care. The following sequence reflects good practice; always defer to your site’s qualified TEL maintenance procedures and safety requirements.
Focus rings are scheduled consumables, so availability and consistency matter as much as the part itself. ESCT Fab Support sources the ES7099-197 ring as a 2nd Source new component verified to the form, fit and function of the OEM part, giving fabs a dependable alternative for keeping etch chambers qualified and running:
It surrounds the wafer and extends the plasma sheath beyond the wafer edge, keeping ion trajectories vertical and the RF field uniform out to the periphery. This preserves edge etch profiles and critical-dimension control, while also protecting the electrode and chuck edge from direct plasma erosion.
No. This is a 2nd Source new part, supplied as a new, OEM-compatible component verified to the form, fit and function of TEL OEM P/N 2L10-252644-11. It is not an original Tokyo Electron part and is not sold as one.
Replacement is driven by accumulated RF hours or wafer count rather than a fixed calendar date, because erosion depends on the process chemistry and bias conditions. Each fab establishes a replacement interval from its own edge-process monitoring; any cracking, chipping or excessive height loss warrants earlier replacement.
"FLT" identifies the flat-profile variant of this ring family, reflecting the specific edge geometry tuned to a particular recipe set. It is important to match the correct profile variant, as the inner diameter, step and wall geometry directly affect the wafer-edge sheath and the resulting etch behaviour.
Because the part is verified to the OEM geometry, it is intended to drop in and reproduce the qualified edge process without recipe changes. As with any consumable replacement, you should still run your standard conditioning recipe and verify edge performance and particles on a monitor wafer before returning the chamber to production.
The typical lead time is 4–5 weeks. The part is referenced by ESCT P/N ES7099-197 and cross-referenced to OEM P/N 2L10-252644-11, allowing you to plan preventive maintenance and hold appropriate buffer stock with clear part traceability.
The 305-T5G50L LAB (FLT) focus ring (OEM P/N 2L10-252644-11, ESCT P/N ES7099-197) is a high-purity, plasma-facing consumable that controls the sheath, RF field and etch behaviour over the outermost edge of every wafer in a TEL 300 mm etch chamber. Its dimensional accuracy and material purity directly govern edge critical-dimension uniformity, profile control and particle performance, and its erosion-driven service life ties consistent, well-specified replacement parts to sustained yield. Supplied by ESCT Fab Support as a verified second-source new component with a 4–5 week lead time, it gives fabs a dependable way to keep etch chambers qualified and running.
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 2L10-252644-11. 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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