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The Silicon Protection Ring (OEM P/N 3D87-052882-12) is a consumable plasma-facing component used in Tokyo Electron (TEL) 300 mm plasma etch process chambers. As a protection ring, it shields underlying chamber hardware (typically a cathode, electrode assembly or wafer support periphery) from direct exposure to the reactive plasma and energetic ion flux that surrounds a 300 mm wafer during etch. The “TE GND FLAT” notation in the part name denotes a machined flat or keyed feature on the ring associated with ground and thermocouple (TE) referencing, so the component seats in a single defined orientation and maintains a consistent electrical and thermal interface to the surrounding assembly.
Within the chamber, the protection ring occupies the annular zone immediately outboard of the active process area. Here it is subjected to the same aggressive environment that governs etch results at the wafer edge: high-density plasma, fluorocarbon and oxygen-bearing chemistries, RF bias and elevated surface temperatures. Because it is fabricated from silicon, the ring shares the chemical behaviour of the wafer itself, which is what keeps the plasma sheath and etch by-product chemistry uniform across the transition from the wafer to the chamber wall.
As a sacrificial silicon part, this protection ring is expected to erode in service and is replaced on a scheduled preventive maintenance interval. Its condition directly affects edge die yield, particle counts and the integrity of the RF return path, which makes it a critical line item in any TEL etch spares inventory.
The protection ring performs several interdependent jobs at the chamber periphery. It is not merely a cover; it is an active participant in shaping the plasma, conducting RF current and managing the thermal and chemical boundary at the wafer edge.
The ring is machined from high-purity silicon so that its plasma interaction matches the silicon wafer being processed. This material choice is deliberate and central to the part’s behaviour.
In service the ring must tolerate cyclic thermal loading and continuous ion flux without distorting or shedding particles, while presenting a stable surface to the discharge.
Because the protection ring sits directly at the boundary between the wafer and the chamber, its condition propagates straight into device results. A worn, cracked or misoriented ring shows up first at the outermost die and in particle excursions.
Continuous ion bombardment gradually sputters silicon from the exposed surface. As the ring thins, the sheath geometry at the wafer edge changes and edge etch performance drifts, eventually risking exposure of the hardware the ring is meant to protect.
Silicon is brittle, so thermal cycling, mechanical mishandling during PM or an uneven seat against the ground flat can initiate cracks or chips. Fractured silicon is a direct particle source and can compromise the electrical contact that defines the ground reference.
Fluorocarbon chemistries deposit polymer on the ring between cleans. Excessive build-up flakes off as defects and can localise charge, leading to micro-arcing that pits the silicon and disturbs the local plasma. Degraded grounding at the flat aggravates this behaviour.
Replacement is performed during scheduled preventive maintenance with the chamber vented and the tool following the OEM lockout and ESD procedures. The following sequence reflects general good practice; always defer to the applicable TEL maintenance documentation for the specific platform.
Protection rings are recurring consumables, so a dependable second source materially reduces both cost per wafer and the risk of unplanned downtime. ESCT Fab Support supplies this ring as a verified, fab-ready alternative to sole-source OEM procurement.
The ground flat is a machined feature that keys the ring into a single correct orientation and defines a consistent grounding and thermal-reference interface to the surrounding hardware. It holds the RF return path and edge temperature are repeatable each time the part is fitted.
No. This ring is supplied as a new, OEM-compatible second-source component. It is manufactured to match the form, fit and function of the original TEL part but is not an original OEM-branded item.
Silicon is chosen so the ring etches and interacts with the plasma in the same way as the wafer. This keeps the chemistry and sheath behaviour continuous across the wafer edge, which is important for edge uniformity and for controlling etch by-products.
As a sacrificial consumable, it is replaced on a process-dependent PM interval determined by accumulated RF hours, observed erosion and particle or edge-uniformity trends. The correct interval is set by your own qualification data and TEL maintenance guidance.
Excessive erosion can expose and damage the cathode or electrode beneath the ring, raise particle counts and shift edge etch performance and RF grounding, all of which threaten edge die yield. Timely replacement protects the more expensive base hardware.
The typical lead time is 4-5 weeks. Order using ESCT P/N ES7099-054, cross-referenced to OEM P/N 3D87-052882-12, so the correct silicon protection ring is identified without ambiguity.
The Silicon Protection Ring (OEM P/N 3D87-052882-12, ESCT P/N ES7099-054) is a sacrificial silicon consumable for TEL 300 mm plasma etch chambers that shields the underlying electrode hardware, supports edge etch uniformity and provides a defined ground reference through its machined ground flat. Made from high-purity silicon to match wafer chemistry, it erodes predictably and must be replaced on a planned PM interval to protect yield, particle performance and base hardware. ESCT Fab Support offers it as a verified second-source part with a 4-5 week lead time, giving fabs a cost-effective, dependable alternative for a frequently replaced chamber consumable.
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 3D87-052882-12. 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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