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The LAM Hot Edge Ring identified by OEM part number 716-040738-120 is a plasma-exposed consumable ring fitted to the LAM Research Exelan FLEX 45 capacitively coupled dielectric etch chamber. It is the component referenced in the raw catalogue label “(C2)HOT EDGE RING FLEX45(MID)”, where “C2” denotes the chamber or component slot, “FLEX45” the tool platform, and “MID” the mid-position variant within the stacked edge-ring assembly that surrounds the production wafer. The ring sits immediately outboard of the 300 mm wafer, encircling its perimeter so that the plasma sheath sees a continuous, electrically consistent surface from the centre of the substrate out past the wafer edge.
As a “hot” edge ring, this part is deliberately allowed to run at an elevated temperature relative to cooler confinement and ground hardware. That thermal design point is what distinguishes it from a focus ring or a grounded confinement ring: the hot edge ring helps shape the radial temperature gradient and the local electrical environment at the wafer edge, where etch behaviour is most sensitive and where the largest die-loss risk traditionally lives. In a high-volume dielectric etch process (contact, via, trench and self-aligned structures in oxide and nitride stacks) the edge ring is one of the parts that most directly determines whether the outer ring of die on every wafer is saleable.
Because it is consumed by continuous ion bombardment and fluorocarbon plasma chemistry, the hot edge ring is a scheduled-replacement item. Its erosion profile is one of the primary drivers of preventive maintenance intervals on the FLEX 45, and its condition feeds directly into edge etch rate, profile control and particle performance. Keeping a qualified, dimensionally faithful replacement on the shelf is therefore central to chamber availability.
The hot edge ring performs several overlapping jobs at once, electrical, thermal, plasma-shaping and mechanical. Within the LAM FLEX 45 chamber it works as part of a coordinated ring stack to extend a uniform process environment beyond the physical edge of the wafer.
A hot edge ring lives in one of the most aggressive locations in the chamber, so its material and dimensional behaviour under fluorocarbon plasma define its working life. The two performance axes that matter most are plasma resistance and dimensional stability under thermal and electrical stress.
Edge-ring consumables for dielectric etch are produced from high-purity process materials selected to erode predictably under energetic fluorocarbon and oxygen-bearing plasmas rather than spalling or generating particles. A faithful replacement must match the OEM material grade and surface finish so that erosion rate, secondary electron behaviour and contribution to the chamber chemistry track the original part. Material purity directly governs metallic and particulate contamination risk at the wafer edge.
Running hot means the ring must tolerate repeated thermal cycling without warping, cracking or shifting its seated height. Flatness, concentricity and the wafer-to-ring step are tightly toleranced because a fraction of a millimetre of variation translates into measurable edge etch non-uniformity. Dimensional fidelity to the OEM drawing is what allows a replacement to restore baseline process behaviour without re-tuning the recipe.
Because the hot edge ring governs the outermost annulus of every wafer, its state has an outsized effect on yield and on the economics of the etch chamber. Edge die are the most expensive to lose because they have already accumulated full upstream processing cost.
The dominant wear mode is steady erosion of the exposed surface under ion bombardment and chemical attack. As the ring thins, the local sheath height and step relative to the wafer change, gradually shifting edge etch rate and feature profile until the part falls outside its qualified window and edge yield begins to roll off.
Repeated heating and cooling, combined with handling during maintenance, can initiate micro-cracks that propagate into chips or fractures. A cracked hot edge ring becomes a particle source and a contamination risk, and in severe cases can disturb the seating plane and the edge electrical environment.
Fluorocarbon chemistries deposit polymer on and around the ring. As coatings thicken and the surface roughens with age, flaking can release particles onto the wafer. Rising edge particle counts on inspection are a classic late-life indicator that the ring has reached the end of its service interval.
Replacement should follow LAM-approved procedures for the FLEX 45 chamber and be carried out by trained technicians during a scheduled preventive-maintenance window. The following sequence outlines the typical workflow; always defer to the OEM service documentation and your facility’s safety protocols.
Hot edge rings are high-turnover consumables, so their availability and cost have a direct bearing on cost-of-ownership for the FLEX 45 fleet. ESCT Fab Support supplies this ring as a qualified alternative to sole-sourcing through the OEM, giving maintenance and procurement teams more flexibility.
It encircles the 300 mm wafer at the chamber periphery and extends a uniform electrical, thermal and plasma environment beyond the wafer edge. By running hot and shaping the edge sheath, it helps control etch rate, feature profile and particle performance for the outermost die.
No. This ring is supplied as a new, second-source, OEM-compatible component verified to the form, fit and function of LAM OEM part number 716-040738-120. It is not an original LAM-branded part, but it is intended as a direct functional replacement.
“MID” identifies the mid-position variant within the FLEX 45 edge-ring assembly. Edge-ring stacks often include parts at different radial or vertical positions, so it is important to confirm you are ordering the mid-position ring that matches your chamber’s configuration.
Typical indicators are drift in edge etch rate or critical dimension, degraded profile at the wafer periphery, rising edge particle counts on inspection wafers, or visible erosion, thinning, cracking or chipping during PM. Most fabs replace the ring on a fixed RF-hour or wafer-count interval qualified for their process.
Because the part is built to match the OEM dimensions and material, a correctly seated new ring is intended to restore baseline edge behaviour without recipe changes. Standard practice is still to run conditioning and qualification wafers after any chamber-open event to confirm performance before resuming production.
The current quoted lead time is approximately 4 to 5 weeks. As a frequently consumed item, it is sensible to hold buffer stock and place reorders in line with your preventive-maintenance schedule to avoid unplanned downtime.
The LAM Hot Edge Ring, mid position (OEM P/N 716-040738-120, ESCT P/N ES2099-015), is a plasma-exposed consumable that surrounds the wafer in the Exelan FLEX 45 dielectric etch chamber. It extends a uniform electrical, thermal and plasma environment past the wafer edge, directly governing edge etch uniformity, profile control, particle performance and the yield of the outer die ring. As a scheduled-replacement part subject to erosion, thermal cracking and polymer-related particle generation, it must be dimensionally and materially faithful to the OEM to restore baseline process behaviour on installation. Supplied by ESCT Fab Support as a verified second-source alternative with a roughly 4 to 5 week lead time, it offers a cost-effective, readily reorderable route to maintaining chamber availability across a FLEX 45 fleet.
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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