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The cathode electrode supplied under ESCT P/N ES2099-029 is the powered, plasma-facing electrode at the heart of a LAM 300 mm plasma etch process chamber. Catalogued by the OEM as 716-069688-005(S), this component sits within the upper or lower electrode stack depending on chamber configuration and forms the conductive, RF-driven surface that couples energy into the process gas and ignites and sustains the plasma. Because it is directly exposed to ion bombardment, reactive radicals and the full thermal load of the discharge, the cathode is one of the most heavily worked consumables in the entire tool.
In a 300 mm etch chamber, the cathode does far more than carry current. Its geometry, surface condition and material grade set the sheath profile directly above the wafer, govern the distribution of ion flux across the wafer radius, and provide a defined surface for the plasma to terminate against. The part is typically fabricated from high-purity, electrically conductive material, commonly doped silicon or a comparable plasma-grade conductor, so that it both participates in the discharge chemistry and survives prolonged erosion without contaminating the process. As a silicon-bearing electrode, it is frequently consumed slowly and intentionally during processing, which ties consistent material quality to repeatable results.
Replacing this electrode is part of routine chamber maintenance. As it wears, etch rate, uniformity and particle performance drift, and eventually the part must be swapped to recover the process window. Holding a qualified, form-fit-function equivalent on the shelf protects against extended downtime when the OEM lead time is unacceptable.
The cathode is the primary RF-coupling surface in the etch chamber. Every aspect of its design (diameter, thickness, surface finish and resistivity) is tuned to deliver a stable, uniform discharge over the wafer. Its core functions include the following.
Because the cathode is both an electrical component and a consumable surface in contact with aggressive plasma chemistry, its performance is judged on two fronts: the integrity of the bulk material and the stability of its electrical and erosion behaviour over a campaign.
A plasma-grade silicon cathode must be manufactured to tightly controlled purity and resistivity specifications. Trace metallic contamination, inclusions or inconsistent doping translate directly into wafer defects and process drift.
During processing the plasma-facing surface is steadily consumed by physical sputtering and chemical attack. A well-made electrode erodes slowly and uniformly, keeping the process window stable for as long as possible.
Few consumables influence etch results as directly as the cathode. Its condition propagates straight through to wafer-level metrics, so degraded or out-of-spec electrodes carry real yield and cost consequences.
Understanding how a cathode degrades helps maintenance teams plan replacement before the process slips out of control.
The dominant wear mode is gradual loss of plasma-facing material through sputtering and chemical etching. As the electrode thins and its surface roughens, sheath geometry and RF coupling shift, moving etch rate and uniformity off target until the part reaches its replacement threshold.
Thermal cycling and mechanical stress can initiate micro-cracks in the silicon, which propagate over time. Cracked or flaking material sheds particles into the chamber, contaminating wafers and, in severe cases, risking catastrophic fracture of the electrode during a process cycle.
Poor contact at the RF feed or ground interface (caused by oxidation, deposit build-up or loose hardware) raises contact resistance and creates uneven current paths. This destabilises the plasma, can cause localised hot spots and arcing, and accelerates wear at the affected regions of the electrode.
Replacing the cathode is a precision task performed during scheduled preventive maintenance. The following sequence summarises good practice; always follow the OEM service procedure and your site safety protocols.
Plasma-facing electrodes are recurring consumables, so a sound sourcing strategy keeps tools running without overcommitting capital to OEM-only supply. ESCT Fab Support helps fabs balance availability, cost and quality.
It is the RF-powered, plasma-facing electrode that couples energy into the process gas to strike and sustain the plasma, shapes the sheath above the wafer, and provides a controlled silicon surface that influences etch chemistry and uniformity.
No. This electrode is supplied as a 2nd source, new, OEM-compatible part. It is manufactured and qualified to match the form, fit and function of the original LAM component but is not an original OEM part and is not sold as one.
As a silicon cathode it is fabricated from high-purity, plasma-grade conductive silicon with controlled resistivity. This allows it to couple RF energy efficiently while eroding cleanly and predictably without introducing metallic contamination to the wafer.
Replacement is typically driven by accumulated RF or wafer hours, by drift in etch rate and uniformity, or by rising particle counts. Visual inspection during preventive maintenance for thinning, pitting or cracking confirms when the part has reached the end of its useful life.
The current lead time is 4–5 weeks. We recommend aligning orders with your planned maintenance schedule and holding buffer stock for critical tools so that an electrode swap never gates production.
The part is built to match the original specification, but as with any consumable change you should run your standard qualification wafers after installation to confirm etch rate, uniformity and particle performance before returning the tool to production.
The cathode electrode under ESCT P/N ES2099-029 (OEM P/N 716-069688-005(S)) is a critical RF-powered, plasma-facing consumable for LAM 300 mm etch chambers. It couples RF energy into the discharge, defines the plasma sheath above the wafer, and provides a controlled silicon surface that governs etch uniformity and particle performance. Supplied 2nd source new with a 4–5 week lead time and verified to OEM form, fit and function, it offers fabs a cost-effective, reliable alternative for keeping etch tools in qualified production.
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 Lam Research part number 716-069688-005(S). It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Lam Research, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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