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The LAM Hot Edge Ring (OEM P/N 716-040738-120), designated as a Flex45 polished variant, is a wafer-perimeter consumable that sits immediately outboard of the 300 mm wafer within the lower electrode assembly of a LAM Research plasma etch chamber. As a "hot" edge ring it is intended to run at an elevated, RF-coupled temperature rather than being held passively cool, which is fundamental to how it shapes the plasma sheath and thermal profile at the most sensitive region of the wafer, the extreme edge.
In a modern high-aspect-ratio etch process, the few millimetres of silicon at the wafer edge are notoriously difficult to control. Sheath bending, RF field termination and local gas residence time all change abruptly where the wafer ends and the surrounding hardware begins. The hot edge ring is the component engineered to manage that discontinuity, extending the effective electrical and thermal boundary of the wafer outward so that ion flux, ion energy and etch rate remain uniform right out to the last die. The polished surface finish referenced in the part name is a deliberate process tuning feature: a controlled, low-roughness face influences secondary electron behaviour, particle adhesion and consistency of plasma coupling across the ring.
Because it is exposed directly to energetic ion bombardment and aggressive process chemistries, the hot edge ring is a scheduled consumable. Its condition has an outsized effect on edge yield, defectivity and chamber matching, making a reliable, qualified supply of replacement rings central to keeping etch tools productive and stable across preventive maintenance cycles.
Within the lower electrode stack, the hot edge ring performs several overlapping electrical, thermal and process-confinement duties at the wafer perimeter. It is not a passive spacer; it is an active participant in shaping the plasma sheath and the RF return path at the chamber edge.
As a plasma-facing consumable, the value of this ring lies in how its material behaves under sustained ion bombardment and reactive chemistry, and in how tightly its geometry and surface are held. Both factors directly govern process stability and ring lifetime.
Edge rings of this class are produced from high-purity, etch-grade materials selected for low sputter yield and chemical stability in fluorine- and chlorine-based plasmas. The objective is a slow, predictable, planar erosion rate so that the ring wears uniformly across a known service window, keeping edge process behaviour drifting gently and correctably rather than failing abruptly.
The Flex45 polished designation indicates a tightly toleranced ring with a controlled, low-roughness face. Flatness, inner-diameter step height relative to the wafer and the finish of the plasma-facing surface all feed directly into sheath geometry, so they are held to fine tolerances for consistent edge results and clean tool-to-tool matching.
Because it governs the most marginal region of the wafer, the hot edge ring exerts an influence on yield far larger than its physical size would suggest. Its condition is often the deciding factor in how many edge dies survive a given process.
The dominant wear mode is gradual sputter erosion of the plasma-facing surface. As material is removed, the inner step height drops and the sheath geometry at the wafer edge shifts, causing the edge etch rate and profile angle to drift away from the qualified target until the ring reaches its end of life.
Roughening of the eroded surface and the build-up of redeposited polymer or by-product films can flake away during processing or wafer transfer. These particles land on the wafer edge as added defects and are a frequent driver of yield excursions and unplanned cleaning.
Thermal cycling, mishandling during preventive maintenance or localised arcing can chip or crack the ring. Any loss of seating flatness or surface integrity disturbs the RF coupling and thermal contact, producing localised non-uniformity and accelerating further damage.
The hot edge ring is replaced during scheduled preventive maintenance with the chamber vented and the lower electrode accessible. Cleanliness and correct seating are critical, since any debris or misalignment beneath the ring directly degrades edge performance. The following sequence reflects general good practice; always follow the applicable LAM maintenance procedure for the specific platform.
Edge rings are high-turnover consumables, so a dependable replacement supply chain keeps etch tools available and edge yield stable. ESCT Fab Support provides qualified compatible rings that reproduce the form, fit and function of the OEM part while improving cost predictability and lead-time flexibility.
It sits just outboard of the 300 mm wafer in the lower electrode and extends the electrical and thermal boundary of the wafer outward. By shaping the plasma sheath and stabilising the edge temperature at an elevated, RF-coupled level, it keeps etch rate, ion energy and feature profiles uniform out to the extreme wafer edge.
No. This ring is supplied as a new, OEM-compatible second-source component. It is manufactured to match the form, fit and function of LAM OEM P/N 716-040738-120 and is not an original OEM-branded part. It cross-references to that OEM number purely for compatibility identification.
It identifies a specific ring configuration with a controlled, low-roughness polished face. The polished finish is a deliberate process feature that stabilises plasma coupling, influences secondary electron behaviour and minimises particle adhesion at the wafer edge.
As a plasma-exposed consumable, its life depends on the chemistry, power and duty of your process. It is typically retired on a defined RF-hours or wafer-count schedule, or sooner if edge uniformity drift or rising particle counts indicate erosion has reached its limit.
As the ring erodes, the edge sheath geometry shifts, producing tilted etch profiles, edge critical-dimension drift and loss of edge-die yield. A roughened or flaking surface also adds particles, raising defectivity and potentially forcing an unscheduled chamber clean.
The indicative lead time is 4–5 weeks, which supports planned preventive maintenance scheduling. Order against ESCT P/N ES2099-013, quoting the LAM OEM reference 716-040738-120 if helpful, and our team can assist in confirming fitment for your etch platform.
The LAM Hot Edge Ring, Flex45 polished (OEM P/N 716-040738-120, ESCT P/N ES2099-013) is a precision wafer-edge consumable that governs sheath geometry, edge thermal behaviour and plasma confinement at the most yield-critical region of the 300 mm wafer. Its high-purity material, tight dimensional tolerances and controlled polished finish are what keep edge etch uniformity, critical-dimension control and particle performance within specification across the service window. Supplied by ESCT Fab Support as a new, OEM-compatible second-source part with a 4–5 week lead time, it offers a cost-effective, qualified route to maintaining etch-tool availability and stable edge yield.
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 716-040738-120. 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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