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The TEL focus ring identified by OEM part number 2L10-252646-11, internally designated 314-T5G50L, is a precision annular consumable installed at the outer perimeter of the electrostatic chuck (ESC) in Tokyo Electron 300 mm plasma etch process chambers. The descriptor “LAB SHAL” in the source nomenclature refers to its shallow labyrinth profile, a stepped, recessed seat geometry that allows the ring to nest closely against the chuck shoulder while shielding the underlying clamping and gas-delivery hardware from direct plasma exposure. As a focus ring, it sits immediately outboard of the 300 mm wafer and functions as the radial boundary that conditions the plasma sheath across the wafer edge.
In any capacitively coupled or high-density etch reactor, the wafer edge is the hardest region to control. The sheath that forms over the wafer surface naturally bends and terminates at the wafer’s physical boundary, and without compensation this bending steers incoming ions away from vertical, degrading etch profiles in the last few millimetres of usable silicon. The focus ring extends the effective electrical and physical surface beyond the wafer so that the sheath remains planar across the edge, preserving vertical ion trajectories where they would otherwise diverge. Because it is consumed by the same ion bombardment it manages, the 314-T5G50L is a scheduled-replacement item rather than a permanent assembly component.
ESCT Fab Support supplies this focus ring under part number ES7099-199 as a second-source, factory-new component verified to the form, fit and function of the original TEL item. It is intended for fabs that need to maintain edge yield and chamber availability without being constrained to single-source OEM procurement.
The focus ring is one of the most influential consumables in the chamber for edge-of-wafer results. In TEL etch platforms its job is simultaneously electrical, geometric and thermal, and its condition directly maps onto the width of the usable process band at the wafer perimeter.
Focus rings in this class are produced from plasma-grade materials selected to survive sustained fluorine- and chlorine-based chemistries while contributing minimally to particle and metallic contamination. The exact grade for any given recipe is matched to the process, but the performance criteria are consistent across the family.
The ring must hold its profile under continuous ion bombardment and aggressive halogen radicals. Materials such as high-purity silicon, silicon carbide, quartz or fine-grain alumina are chosen for low sputter yield, predictable erosion behaviour and chemical inertness so that the edge geometry degrades slowly and uniformly rather than pitting or spalling.
Bulk and surface purity govern how much the ring contributes to on-wafer defectivity, while the machined tolerances of the shallow labyrinth seat, inner diameter and top surface determine how cleanly the ring registers against the chuck. Tight dimensional control keeps the wafer-to-ring gap and the ring height consistent, which matters because both directly influence sheath shape at the edge.
Because the focus ring governs the etch environment for the outermost dies, its condition has an outsized effect on overall wafer yield. A worn or mis-seated ring narrows the usable area and can quietly erode device counts long before any obvious chamber fault is flagged.
The focus ring is a sacrificial part by design, but its failure signatures are distinctive and are best caught through scheduled inspection and edge-yield monitoring rather than left to run to the point of process excursion.
Sustained ion bombardment gradually thins the ring and lowers its top surface relative to the wafer. As height is lost, the sheath drops at the edge, ion trajectories tilt inward and edge critical dimensions and profile angle drift, the dominant end-of-life mechanism for this component.
Thermal cycling, mechanical handling and localised hot spots can fracture brittle ring materials. Cracks and chips release particles onto the wafer and disturb the local field, and a fractured ring must be removed immediately to prevent defect events and possible damage to the chuck.
If the shallow labyrinth seat is fouled by polymer residue or the ring is not seated flat, the wafer-to-ring gap and RF return path change. This produces edge tilt, asymmetric uniformity and intermittent results that are easily misattributed to the recipe rather than to ring seating.
Replacement should follow TEL’s documented procedure for the specific chamber and recipe. The sequence below summarises good practice; always defer to the OEM maintenance manual and your fab’s qualification protocol.
Focus rings are high-turnover consumables, and edge-yield risk makes uninterrupted supply a planning priority. Sourcing the 314-T5G50L through ESCT Fab Support gives fabs a qualified second-source option that supports preventive-maintenance schedules and inventory resilience.
It sits just outboard of the 300 mm wafer at the edge of the electrostatic chuck and extends the plasma sheath beyond the wafer boundary. This keeps ion trajectories vertical across the wafer edge, preserving etch profile and critical-dimension uniformity for the outermost dies.
No. It is supplied as a second-source, factory-new component that is verified to the form, fit and function of TEL OEM P/N 2L10-252646-11. It is not an original OEM part and is offered as an OEM-compatible alternative under ESCT P/N ES7099-199.
Service life depends on chemistry, RF power and duty cycle, so intervals are set by each fab’s PM schedule and edge-yield data rather than a fixed figure. The ring is consumed by ion bombardment, so it is monitored for height loss and replaced before edge uniformity drifts out of specification.
“314-T5G50L” is the TEL internal designation for this specific ring variant, and “LAB SHAL” denotes its shallow labyrinth seat geometry. The labyrinth profile lets the ring nest against the chuck shoulder and shields the underlying clamping and edge hardware from direct plasma exposure.
The typical lead time is 4–5 weeks. Because focus rings are scheduled-replacement consumables, fabs are encouraged to hold buffer stock aligned to their preventive-maintenance cycles so that chamber availability is never gated by procurement.
Because the part is verified to the dimensional and material characteristics of the original, it is intended to maintain the same edge-confinement geometry as the OEM ring. Following normal seasoning and qualification on monitor wafers after installation keeps chamber-to-chamber matching within your established control limits.
The TEL focus ring 314-T5G50L (OEM P/N 2L10-252646-11, ESCT P/N ES7099-199) is an edge-confinement consumable for Tokyo Electron 300 mm plasma etch chambers. Seated against the electrostatic chuck via a shallow labyrinth profile, it extends the plasma sheath past the wafer edge to hold ion trajectories vertical, protecting edge critical dimensions, profile control and edge-die yield. As a sacrificial part it erodes predictably and is replaced on a PM schedule. ESCT Fab Support offers it as a second-source, factory-new alternative with a 4–5 week lead time, giving fabs a qualified, supply-resilient route to maintaining edge performance and chamber availability.
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 2L10-252646-11. 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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