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The Focus Ring, 306-T5 Flat (OEM P/N 2L10-252693-11) is a wafer-edge plasma confinement consumable used in Tokyo Electron (TEL) 300 mm plasma etch process chambers. It is the annular ring that surrounds the 300 mm wafer where it sits on the electrostatic chuck, bridging the gap between the silicon being processed and the surrounding chamber hardware. The “306-T5 Flat” designation refers to the specific profile family and the flat upper-surface geometry that defines how the sheath behaves across the last few millimetres of the wafer perimeter.
In an etch chamber, the focus ring is one of the most directly consumed parts in the process kit. It is continuously exposed to energetic ions, reactive radicals and RF fields, and it physically erodes over time in a way that gradually alters edge etch behaviour. Because the ring sits at the boundary between the wafer and the bias electrode, its shape, height and dielectric properties have an outsized influence on the uniformity, profile angle and defectivity of devices located in the outermost die.
As an edge-critical consumable, the 306-T5 flat focus ring is replaced on a defined wear interval rather than run to failure. A healthy, correctly seated ring keeps wafer-edge yield within specification and protecting the underlying chuck and RF return path from premature damage.
The focus ring extends the wafer’s electrical and physical surface outward so that the plasma sheath terminates beyond the silicon rather than collapsing across the wafer edge. By “focusing” the ion trajectories at the perimeter, it allows the same vertical etch behaviour seen at wafer centre to continue out to the very last die. Its key functions include:
Focus rings of this type are manufactured from process-grade materials selected to balance plasma resistance against the need to manage particle generation. Depending on the recipe set, etch focus rings are commonly produced from high-purity silicon or silicon-based ceramic, chosen so the ring erodes in a controlled, predictable manner and so that any sputtered material is chemically compatible with the wafer being processed. The objective is steady, even wear rather than localised pitting or flaking.
The flat profile of the 306-T5 ring relies on tight control of inner diameter, outer diameter, thickness and the flatness of the upper surface. Small deviations in any of these dimensions shift the sheath geometry and the ring-to-wafer gap, which directly changes edge etch rate and profile. A precision-finished surface also reduces nucleation sites where polymer and etch by-products would otherwise accumulate.
Because the focus ring controls the most variable region of the wafer, its condition shows up immediately in edge metrology. A worn, mis-seated or out-of-spec ring drives a predictable set of consequences:
The dominant wear mode is steady erosion of the upper surface under ion bombardment. As the ring loses height, the sheath at the wafer edge gradually changes shape, tilting edge etch profiles and pushing edge CD out of specification. This is the normal end-of-life mechanism and the reason the ring is replaced on a scheduled RF-hour interval.
Repeated thermal cycling, mechanical handling during maintenance, or an uneven seat can initiate cracks and edge chips in a brittle ring. Fragments become a serious particle source and can land on the wafer or in the chamber, so any visible cracking or chipping calls for immediate replacement rather than continued use.
Etch by-products and polymer can accumulate on the ring and on its seating surface. A contaminated or poorly seated ring sits at the wrong height or tilts slightly, breaking the concentric gap to the wafer and creating azimuthal non-uniformity. Careful cleaning of the seat and verification of flat, even contact at install prevent this failure mode.
Focus ring replacement is a routine preventive-maintenance task, but it must be performed cleanly to protect both the new ring and the chamber. Follow the tool owner’s approved maintenance procedure and qualified clean-room practice:
Focus rings are high-turnover consumables, so a reliable second-source supply protects both tool availability and budget. ESCT Fab Support supplies the ES7099-207 focus ring as a part verified to the form, fit and function of the original TEL component, with the following advantages:
It surrounds the 300 mm wafer at the edge and shapes the plasma sheath so that ion trajectories stay vertical out to the wafer perimeter. This keeps edge etch profiles and critical dimensions uniform and protects the chuck from direct erosion, with the flat profile defining the specific sheath geometry for this kit.
No. This is a new, second-source part supplied by ESCT Fab Support and verified to the form, fit and function of the original TEL component. It is not an original OEM part and is not sold as one; it is offered as an OEM-compatible alternative for TEL 300 mm etch chambers.
Focus rings are replaced on a defined RF-hour or wafer-count interval set by the process owner, because erosion is continuous and progressive. The right interval depends on the recipe and the edge specification, and is usually refined from inspection of worn rings and edge metrology trends.
Typical indicators are drifting edge critical dimension, tilted edge etch profiles, worsening centre-to-edge non-uniformity and rising particle counts. Visible erosion below the wear limit, cracking or chipping on inspection are all reasons to replace the ring immediately.
Etch focus rings of this type are made from high-purity, process-compatible materials such as silicon or silicon-based ceramic, selected for controlled erosion and low contamination. The exact material grade is matched to the chamber recipe so that wear behaviour and particle performance align with the original part.
The typical lead time is 4–5 weeks. Because the focus ring is a recurring consumable, many fabs hold buffer stock and place repeat orders against their preventive-maintenance schedule to avoid any impact on tool availability.
The Focus Ring, 306-T5 Flat (OEM P/N 2L10-252693-11, ESCT P/N ES7099-207) is an edge-critical plasma confinement consumable for TEL 300 mm etch chambers. It shapes the sheath at the wafer perimeter to keep edge etch uniformity, profile and particle performance within specification, and it wears in a controlled, predictable way that makes scheduled replacement necessary. Supplied by ESCT Fab Support as a new, second-source part verified to form, fit and function, it offers a cost-effective, reliable alternative for keeping TEL etch process kits in qualified 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 2L10-252693-11. 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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