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The Ring Protection Assembly designated TE-RP470 is a plasma-facing consumable component fitted within the lower electrode stack of Tokyo Electron (TEL) 300 mm plasma etch process chambers. Its role is exactly what the name implies: it protects underlying, harder-to-replace hardware, the electrostatic chuck periphery, focus ring seating, insulator surfaces and metallic clamp rings, from the corrosive plasma chemistry and energetic ion bombardment that characterise high-density etch processing. By taking the brunt of the plasma exposure at the wafer edge region, the protection ring becomes the sacrificial layer that preserves the integrity and service life of the more expensive assemblies beneath it.
In a 300 mm etch chamber the area immediately surrounding the 300 mm wafer is one of the most aggressive environments in the entire tool. Fluorine- and chlorine-bearing plasmas, combined with high RF bias accelerating ions onto every exposed surface, attack any material that is not deliberately engineered to resist them. The protection ring sits in this zone as a continuous annular barrier, masking structural and dielectric surfaces that must not be allowed to erode, sputter or generate particles. Where a focus ring shapes the plasma sheath above the wafer edge, the protection ring works one level lower, shielding the components that hold the wafer-edge environment together.
Because it is a wear item that is consumed in normal operation, the protection ring is a routine replacement part on a planned-maintenance schedule. Keeping a verified, dimensionally correct ring on hand prevents an avoidable chamber-down event from cascading into wafer-edge yield loss or damage to the parts the ring is meant to defend. This page describes the function, materials behaviour, failure modes and replacement of the TE-RP470 protection ring supplied by ESCT Fab Support under part number ES7099-053.
The protection ring performs several interlinked functions in the lower electrode assembly. It is not a passive cover; its geometry, surface finish and material selection all influence how the chamber edge region behaves electrically, thermally and in terms of particle generation. Its principal duties include:
Protection rings in TEL etch chambers are manufactured from materials chosen specifically for their resistance to the chemistry of the process they serve. The TE-RP470 is supplied to match the form, fit and function of the original component, so its material and surface specification reflect the demands of the wafer-edge environment in which it operates.
The ring is engineered to withstand sustained exposure to fluorine- and chlorine-based etch chemistries and energetic ion bombardment. Materials used for protection rings of this type are selected for low etch rate against the relevant plasma, dimensional stability under repeated thermal cycling, and an erosion behaviour that remains uniform and predictable rather than producing localised pitting or flaking.
Fit is critical for a protection ring: the seating face, inner and outer diameters and overall height must reproduce the original geometry so that the ring sits flush, masks exactly the intended surfaces and does not perturb the plasma sheath or thermal contact at the chamber edge.
Although it is a protective and largely sacrificial component, the condition of the protection ring has a direct bearing on process results and on the health of the surrounding hardware. A worn, cracked or incorrectly fitted ring quickly translates into measurable problems at the fab level:
The dominant wear mechanism is gradual erosion from ion bombardment and chemical attack. Over many RF hours the ring thins and its profile changes, shifting the edge-region plasma conditions and eventually exposing the surfaces it was installed to protect. This is normal, expected consumption and is the reason the ring is replaced on a defined interval.
Repeated thermal cycling and the stresses of plasma exposure can lead to micro-cracking, chipping or surface flaking, particularly as the material thins. Liberated flakes become a direct particle source, depositing on the wafer and surrounding surfaces and driving defect-related yield loss long before the ring reaches end of life by erosion alone.
Process by-products can accumulate on the ring surface and at its seating interface. Build-up changes the surface electrical and thermal behaviour, while debris or damage at the seating face prevents the ring from sitting flush, introducing gaps that allow plasma to reach masked hardware and creating non-uniform thermal contact at the chamber edge.
Replacement should be carried out during a scheduled preventive-maintenance window by a qualified technician following the relevant TEL procedure for the specific chamber. The protection ring is handled as a high-cleanliness consumable, so contamination control is as important as mechanical fit. A typical sequence is:
Because the protection ring is a recurring consumable, fabs benefit from securing a reliable, dimensionally verified supply rather than depending on a single channel. ESCT Fab Support offers the ES7099-053 protection ring as a cost-effective alternative for fleets running TEL etch chambers, with the following advantages:
It is a sacrificial annular barrier in the lower electrode assembly of a TEL 300 mm etch chamber. It shields the electrostatic chuck periphery, insulators and clamp hardware from plasma and ion bombardment, taking the wear itself so that the more expensive underlying parts are protected and last longer.
No. This is not an original TEL part. It is supplied as a 2nd-source, brand-new OEM-compatible component, manufactured and verified to match the form, fit and function of OEM P/N 3D10-350067-11 for use in the same application.
As a plasma-exposed consumable, its life is measured in RF hours and depends on the process chemistry, power levels and recipe mix in your chamber. It is replaced on a planned preventive-maintenance interval determined from your own erosion and particle data rather than on a fixed universal figure.
Excessive erosion exposes the hardware the ring was meant to protect, risking damage to the chuck and insulators, while cracking or flaking raises particle counts and defect levels. The changing profile also degrades edge-region etch uniformity and chamber matching, so replace it on time.
The standard lead time is 4-5 weeks. Order by quoting the ESCT part number ES7099-053 or the OEM reference 3D10-350067-11; quoting both gets the correct protection ring matched to your TEL etch chamber.
Because the ring is produced to the original dimensions, material specification and surface finish, it is intended to drop in and behave like the part it replaces. As with any consumable change, the chamber should be conditioned and requalified against your standard particle, etch-rate and uniformity criteria before returning to production.
The TE-RP470 Ring Protection Assembly (ESCT P/N ES7099-053, OEM P/N 3D10-350067-11) is a sacrificial plasma-facing consumable for Tokyo Electron 300 mm etch chambers. Positioned in the lower electrode stack, it shields the electrostatic chuck periphery, insulators and clamp hardware from corrosive chemistry and ion bombardment, helping to maintain edge etch uniformity, low particle levels and stable chamber matching while extending the life of higher-value assemblies. Supplied as a 2nd-source NEW part on a 4-5 week lead time, it gives fabs a verified, cost-effective second source for a critical wear item.
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 3D10-350067-11. 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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