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The Flex45 Inner Electrode is the centre electrode element that sits at the heart of the cathode stack in Lam Research Flex series dielectric etch chambers. Identified by OEM part number 839-044157-031 and supplied by ESCT Fab Support under part number ES2099-033, this is the inner section of the segmented top electrode, the silicon-based surface that faces the plasma directly above the wafer and defines the central region of the etch field. The “SCREW REV01” designation in the part name refers to the revised fastening and mounting scheme used to secure the electrode to its backing and gas-distribution structure, an engineering revision intended to improve repeatability of clamping, thermal contact and electrical bonding across the electrode interface.
In a Flex chamber, the top electrode is typically divided into an inner and an outer zone so that the plasma sheath, RF coupling and gas delivery can be tuned independently across the wafer radius. The inner electrode governs behaviour over the central die, where centre-to-edge etch rate balance, deposition control and particle performance are most sensitive to electrode condition. Because it is a plasma-facing silicon consumable, it erodes over time and is treated as a scheduled replacement item rather than a permanent assembly.
A correctly specified inner electrode is what holds the process window. A worn, cracked or poorly seated electrode shifts the central plasma impedance, changes the gas conductance through the showerhead-style perforations and introduces particle excursions that can scrap wafers and force unplanned chamber opens. ESCT Fab Support stocks ES2099-033 as a form, fit and function alternative so fabs can sustain availability of this critical consumable without depending solely on the OEM supply chain.
The inner electrode performs several interlocking jobs at once. It is simultaneously an RF electrode, a process-gas distribution surface, a thermal interface and a sacrificial silicon source that participates in the plasma chemistry. Its specific functions include the following:
As a plasma-facing electrode, ES2099-033 is built around high-purity silicon engineered for predictable erosion behaviour and low contamination, with a mounting scheme designed for consistent electrical and thermal contact.
The electrode is fabricated from high-purity silicon so that the material it sacrifices into the plasma is chemically compatible with the etch process and does not introduce metallic or particulate contamination. Tight control of resistivity, crystal quality and surface finish governs how the electrode erodes, how its perforations open up over life, and how reproducibly one electrode behaves compared with the next. Consistent material grade is what allows a replacement consumable to match the process signature of the part it succeeds.
The REV01 screw-based mounting arrangement secures the silicon electrode to its backing and gas-feed structure with controlled, repeatable clamping. Good mechanical seating is critical because it simultaneously sets the electrical bond for RF return and the thermal path that removes plasma heat. Uneven clamping or a degraded interface raises local temperature, distorts the impedance the plasma sees, and accelerates non-uniform erosion, so fastener integrity and flatness at the interface are central to long, stable electrode life.
Because the inner electrode defines the central etch environment, its condition propagates directly into wafer-level results and tool availability:
Continuous ion bombardment and chemical attack steadily consume the silicon surface and enlarge the gas perforations. As the electrode thins, sheath behaviour and gas conductance shift, etch rate at the wafer centre drifts, and eventually the part reaches an erosion limit beyond which the process can no longer be recentred by recipe adjustment.
Thermal cycling and mechanical stress at the mounting points can initiate micro-cracks in the brittle silicon, particularly if clamping is uneven or the electrode has thinned in service. Cracks and chipped edges become particle sources, driving defect excursions and, in severe cases, risking fragmentation that contaminates the chamber.
A loose, corroded or unevenly torqued mounting interface degrades both the RF bond and the thermal path. The result is local hot spots, arcing or micro-arcing at the electrode boundary, accelerated and asymmetric erosion, and unstable plasma impedance, failure mechanisms the REV01 screw revision is specifically intended to mitigate when installed correctly.
Replacement should follow the OEM maintenance procedure for the specific Flex chamber and be carried out by trained personnel under appropriate cleanliness controls. A typical sequence is as follows:
Plasma-facing electrodes are scheduled consumables, so availability and consistency matter as much as the part itself. Sourcing ES2099-033 through ESCT Fab Support gives fabs a dependable second-source path with several advantages:
It is the central silicon electrode in the top of a Lam Research Flex etch chamber. It couples RF power and delivers process gas into the central plasma zone, sets the plasma impedance over the wafer centre, and erodes sacrificially as part of the etch chemistry, making it a primary determinant of centre-to-edge uniformity and particle performance.
No. ES2099-033 is not an original Lam Research part. It is supplied as a new, second-source, OEM-compatible component verified to match the form, fit and function of OEM P/N 839-044157-031. It is intended as a direct alternative for maintenance and replacement.
It refers to the revised screw-based mounting and fastening scheme used to secure the electrode to its backing structure. This revision improves the repeatability of clamping, electrical bonding and thermal contact at the electrode interface, all of which influence erosion uniformity and electrode life.
Typical indicators are drifting centre etch rate or uniformity that can no longer be recentred by recipe tuning, rising particle counts, visible thinning or enlargement of the perforations, and any cracking or chipping. Most fabs replace it on a scheduled basis tied to accumulated RF hours or wafer count defined in their preventive-maintenance plan.
The typical lead time is 4–5 weeks. Because the electrode is a scheduled consumable, we recommend aligning orders with your preventive-maintenance calendar and holding appropriate buffer stock to avoid unplanned downtime.
When installed correctly and seasoned per the OEM procedure, the electrode is designed to reproduce the original part’s behaviour. Consistent silicon grade and a correct, even mounting interface are key to maintaining stable etch performance and good matching across chambers. Qualification with monitor wafers after installation is always recommended.
The Flex45 Inner Electrode (OEM P/N 839-044157-031, ESCT P/N ES2099-033) is the central silicon cathode element in Lam Research Flex series dielectric etch chambers. It couples RF power, distributes process gas, sets central plasma impedance and erodes sacrificially, functions that place it at the centre of etch uniformity, particle control and yield. Its REV01 screw mounting scheme is engineered for repeatable clamping, bonding and thermal contact. As a high-purity silicon consumable subject to erosion, cracking and interface degradation, it is a scheduled replacement item, and ESCT Fab Support offers it as a reliable, verified second-source alternative with a 4–5 week lead time to keep production running.
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 839-044157-031. 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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