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The TEL focus ring identified by OEM part number 2L10-252695-11, and catalogued by ESCT Fab Support as ES7099-209, is a precision annular consumable used in Tokyo Electron 300 mm plasma etch process chambers. The descriptor “318-T5.5G76 LAB” reflects the internal TEL revision and configuration coding for this ring family, while its functional identity is unambiguous: it is the focus ring that surrounds the 300 mm wafer at the outer edge of the electrostatic chuck, sitting flush against the wafer periphery within the lower-electrode assembly.
In a capacitively coupled or reactive-ion etch chamber, the focus ring is one of the most influential consumables in the entire process kit. It is the component that physically and electrically extends the wafer surface outward, so that the plasma sheath does not collapse or distort at the wafer edge. Without a correctly dimensioned and electrically matched focus ring, the last several millimetres of every wafer would etch at the wrong rate, with the wrong profile, and at the wrong angle, squandering die that represent a disproportionate share of finished-wafer value.
Because the focus ring is sacrificial, it erodes under continuous ion bombardment exactly as intended, it is a routine replacement item rather than a permanent assembly. Keeping a qualified, dimensionally accurate spare on the shelf is therefore central to sustaining etch-rate uniformity, edge yield and chamber-to-chamber matching across a 300 mm TEL etch fleet.
The focus ring sits in the annular pocket of the lower-electrode (cathode) assembly, concentric with the electrostatic chuck and immediately outboard of the wafer edge. Its top surface is held at a controlled height relative to the wafer so that the plasma sheath transitions smoothly from the wafer onto the ring. In doing so it performs several interlinked roles:
A focus ring lives in one of the most aggressive zones of the chamber: directly in the path of energetic ions, exposed to fluorine, chlorine or bromine chemistries, and cycled thermally on every wafer. The choice of ring material and the precision of its machined geometry therefore determine both how the wafer edge etches and how long the ring survives before it must be replaced.
Focus rings of this class are produced from high-purity etch-grade materials selected to match the electrical behaviour of the process while resisting erosion. Depending on the application these include high-resistivity silicon, silicon carbide or a quartz/ceramic variant, each chosen to balance conductivity, sputter resistance and particle cleanliness.
The performance of a focus ring is as much about its geometry as its material. Inner diameter, ring height relative to the wafer, top-surface flatness and concentricity all feed directly into edge sheath shape, so this consumable is machined and inspected to tight tolerances.
Because the focus ring governs the last few millimetres of every wafer, its condition is directly visible in edge yield maps and in tool-matching data. A worn, mismatched or incorrectly dimensioned ring shows up as a systematic drift at the wafer edge long before it causes an outright fault.
The dominant wear mechanism is intended erosion: continuous ion bombardment gradually sputters the top surface of the ring, lowering its height relative to the wafer. As the ring recesses, the sheath bends down at the edge, edge etch behaviour drifts and the wafer-edge process eventually falls out of specification. This is the primary reason the ring is scheduled for replacement on an RF-hour or wafer-count basis.
Repeated thermal cycling, mechanical stress during handling, or a hard particle trapped under the ring can initiate cracks. A cracked focus ring is a serious risk: it can shed large particles onto the wafer, distort the local plasma, and in the worst case break apart during processing, contaminating the chamber and forcing a full clean and re-qualification.
Over time the ring surface roughens and may accumulate redeposited polymer or by-product films. Rough or contaminated surfaces become particle sources and can change the local electrical behaviour, while flaking deposits and degraded contact can lead to micro-arcing at the wafer edge, producing point defects and accelerating localised damage to the ring and adjacent hardware.
Focus-ring replacement is a routine preventive-maintenance task, but it must be carried out cleanly and precisely because the ring directly controls edge process performance. The following sequence reflects general good practice; always follow the applicable TEL maintenance procedure and your fab’s safety protocols for the specific chamber.
Focus rings are scheduled consumables, which makes their availability a planning issue rather than an emergency one, provided the right inventory strategy is in place. ESCT Fab Support supplies the ES7099-209 ring as a qualified alternative to OEM stock, helping fabs hold the buffer they need without single-source exposure.
It surrounds the 300 mm wafer at the edge of the electrostatic chuck and extends the electrode surface outward, keeping the plasma sheath flat and the ion flux uniform right out to the wafer edge. In short, it controls how the outermost millimetres of every wafer etch, protecting edge die yield and sidewall profile.
No. The ES7099-209 is supplied as a new, OEM-compatible focus ring from a second source. It is verified to the form, fit and function of TEL OEM part number 2L10-252695-11, but it is not an original Tokyo Electron OEM part and is not represented as one.
Service life depends on the process chemistry, RF power and duty cycle, so replacement is normally driven by accumulated RF hours or wafer count rather than a fixed calendar interval. Most fabs define a wear endpoint from edge-performance and erosion data and schedule replacement as a preventive-maintenance event before that endpoint is reached.
Typical indicators include drifting centre-to-edge etch uniformity, tilted or bowed edge profiles, rising particle or defect counts at the wafer edge, and visible recession, roughening or cracking on the ring surface. Any of these signals that the ring height and surface have eroded past the point where edge process is reliable.
The standard lead time is 4–5 weeks. Because focus rings are predictable, scheduled consumables, this lead time fits comfortably into preventive-maintenance planning when buffer stock is maintained against forecast usage.
Yes, in line with normal practice. After fitting a new ring you would typically pump down, run season and clean recipes, and confirm edge uniformity and profile with monitor wafers before returning the tool to production. Following the applicable TEL procedure lets the new ring deliver its intended edge performance.
The TEL focus ring 2L10-252695-11, offered by ESCT Fab Support as ES7099-209, is a sacrificial edge consumable that shapes and confines the plasma at the wafer periphery in Tokyo Electron 300 mm etch chambers. By extending the electrode surface, stabilising the edge sheath and protecting the underlying chuck hardware, it directly determines edge etch uniformity, sidewall profile and edge die yield. Its erosion-driven wear makes it a routine, plannable replacement, and holding a qualified, dimensionally accurate spare is key to sustaining process stability and tool matching across an etch fleet. Supplied new from a second source with a 4–5 week lead time, the ES7099-209 gives fabs a dependable, single-source-risk-reducing alternative for this critical process-kit part.
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 2L10-252695-11. 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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