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The TEL focus ring identified by the descriptor 305-80-T7.0-297 and OEM part number 2L10-252588-11 is a plasma-facing consumable that sits immediately outboard of the 300 mm wafer in a Tokyo Electron capacitively coupled plasma etch chamber. It is the annular ring that encircles the wafer edge on the lower electrode, bridging the electrical and geometric discontinuity between the silicon wafer and the surrounding chamber hardware. In the raw nomenclature, “305” reflects the 300 mm wafer platform it serves, the “T7.0” field denotes a nominal seven millimetre ring thickness, and the trailing dimensions describe the inner and outer diameters that locate it precisely around the wafer perimeter.
Although it carries no active electronics, the focus ring is one of the most influential passive components in the etch process. By extending the electrostatic chuck surface radially and shaping the sheath at the wafer edge, it determines whether the outermost few millimetres of every wafer etch to the same depth, profile and critical dimension as the device-dense centre. Because it is continuously exposed to energetic ions and reactive fluorine- or chlorine-bearing chemistries, it erodes over time and is replaced on a defined preventive maintenance schedule.
This page describes the function, material behaviour, wear characteristics and replacement of the 305-80-T7.0-297 focus ring as supplied by ESCT Fab Support, and explains why a dependable second-source supply chain matters to fabs running high-volume TEL etch fleets.
The focus ring performs several interlocking roles at the wafer edge, all of which exist to make the plasma behave as though the wafer were larger than it really is, so that edge die receive the same process as centre die. Its principal functions include the following.
A focus ring earns its place through how predictably its material erodes and how little it contaminates the process while doing so. The 305-80-T7.0-297 is built and finished to behave consistently across its service life.
Focus rings for TEL etch chambers are produced from high-purity, plasma-compatible materials such as silicon, silicon carbide or quartz depending on the process recipe, all selected to withstand sustained fluorine and chlorine chemistries with low and uniform erosion.
Because the ring defines an electrical and geometric boundary at the wafer edge, its dimensions and surface finish are held to tight tolerances so that every replacement reproduces the same sheath geometry.
The condition of the focus ring propagates directly into device results, and edge die are usually the first to suffer when the ring drifts out of specification. The downstream consequences include the following.
As a sacrificial consumable, the focus ring is expected to wear; the engineering objective is to replace it before that wear degrades the process. The dominant mechanisms are described below.
Continuous ion bombardment and chemical etching steadily remove material from the ring, reducing its thickness and recessing the plasma-facing surface. As the ring thins, the sheath at the wafer edge drops, tilting ion trajectories over the edge die and degrading profile and CD uniformity until the ring reaches its end-of-life thickness limit.
Repeated thermal cycling between idle and high-power plasma conditions stresses the ring, and brittle ceramic or silicon material can develop micro-cracks, edge chips or fractures. Handling damage during preventive maintenance compounds this risk. Any crack or chip becomes a particle source and a localised disturbance in the edge field.
Over a service interval the plasma-facing surface roughens and accumulates redeposited polymer and etch by-products. This altered surface changes local secondary-electron behaviour and erosion rate, can flake to produce defects, and accelerates the drift of edge process behaviour away from the qualified baseline.
Focus ring replacement is a routine preventive-maintenance activity, but because the ring sits at the heart of the wafer-edge environment it must be handled and seated with care. The following sequence reflects good practice; always defer to the site-specific TEL maintenance procedure and safety requirements.
Focus rings are high-turnover consumables, so their availability and consistency have an outsized effect on tool uptime and cost of ownership. Sourcing the 305-80-T7.0-297 through ESCT Fab Support gives fabs a dependable second-source channel with several advantages.
It is the annular ring that surrounds the 300 mm wafer on the lower electrode of a TEL plasma etch chamber. By extending the sheath beyond the wafer edge and shaping the local electric field, it keeps ion trajectories vertical over the edge die so that the outer wafer area etches with the same rate, profile and critical dimension as the centre.
No. This is supplied as a new, second-source OEM-compatible focus ring. It is not an original Tokyo Electron part and is not sold as such; it is manufactured to match the form, fit and function of OEM P/N 2L10-252588-11 so it can be used as a direct functional replacement.
Replacement is normally driven by accumulated process hours or RF-on time against a defined ring-life limit, or by ring thickness measured at PM. Indicators that the ring is at end of life include drifting edge-to-centre uniformity, falling edge die yield, rising particle counts and visible thinning, cracking or surface roughening.
Focus rings for TEL etch chambers are made from high-purity, plasma-resistant materials such as silicon, silicon carbide or quartz, selected to match the process chemistry and to erode predictably with minimal contamination. The correct material for a given chamber follows the qualified process recipe and OEM specification.
Any plasma-facing consumable change should be followed by the site’s standard post-PM qualification, including chamber seasoning and monitor or qualification wafers. Because the ring is built to the original dimensions and material intent, it is designed to drop into the established process window, with on-tool verification confirming edge etch and particle performance before production resumes.
The typical lead time is four to five weeks. Reference the part by ESCT P/N ES7099-188 or by the OEM P/N 2L10-252588-11 when ordering, and we can align supply with your preventive-maintenance and buffer-stock planning.
The TEL focus ring 305-80-T7.0-297 (OEM P/N 2L10-252588-11, ESCT P/N ES7099-188) is a plasma-facing edge-confinement consumable for Tokyo Electron 300 mm etch chambers. Sitting around the wafer on the lower electrode, it shapes the sheath and edge field to keep ion trajectories vertical, protecting edge die uniformity, profile control and particle performance. As a sacrificial part it erodes, thins, cracks and roughens over its service life and is replaced on a planned PM schedule. Supplied by ESCT Fab Support as a new, second-source, OEM-compatible ring with a four to five week lead time, it gives fabs a cost-effective, consistent and reliably available alternative for keeping TEL etch fleets in qualified, high-yield condition.
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 2L10-252588-11. 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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