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The LAM Hot Edge Ring FLEX45 is a consumable edge ring that surrounds the 300 mm wafer at the perimeter of a plasma etch process chamber. Carrying the OEM part number 716-040738-427(S1) and supplied by ESCT Fab Support as ES2099-007, it belongs to the family of edge consumables that sit at the boundary between the wafer surface and the chamber furniture. The term “hot” in the part name reflects that this ring is deliberately held at an elevated temperature relative to a conventional grounded focus ring, allowing it to act as a thermally and electrically active extension of the wafer’s edge environment rather than a passive spacer.
In a 300 mm etch chamber, the outermost few millimetres of every wafer are the hardest to control. Plasma density, sheath shape, ion-trajectory angle and local surface temperature all change abruptly where the wafer ends and the surrounding hardware begins. The hot edge ring is engineered to push that transition outwards, off the product die and onto a sacrificial part. By matching the dielectric and thermal behaviour of the wafer edge as closely as practical, it keeps the etch front vertical and the etch rate stable right out to the last die ring.
Because it is directly exposed to ion bombardment and reactive chemistry, the ring is a scheduled-replacement consumable. Its condition has an outsized effect on edge yield, particle counts and chamber-to-chamber matching, which is why fabs treat the hot edge ring as a tracked, high-turnover spare rather than a fit-and-forget component.
The hot edge ring performs several overlapping duties at once, combining plasma shaping, thermal management and RF coupling into a single annular part that frames the wafer. Its primary functions include:
Edge rings of this class are manufactured from process-compatible materials selected for plasma resistance, dielectric stability and predictable erosion. The FLEX45 hot edge ring must combine the right electrical properties with mechanical and thermal durability to survive thousands of RF hours.
The ring material is chosen to erode slowly and cleanly under fluorine, chlorine and oxygen-bearing plasmas, sputtering away in a controlled manner without shedding loose particulate or contaminating the wafer edge.
As a deliberately heated component, the ring must hold its shape and seat precisely across the temperature range it experiences during processing, since dimensional drift directly translates into edge-uniformity drift.
Because the hot edge ring governs conditions in the very region where edge die are most vulnerable, its state has a direct and measurable effect on fab output. A worn, cracked or mis-seated ring shows up quickly in process data and downstream yield:
The dominant wear mode is gradual erosion of the upper surface and inner step under continuous ion bombardment. As material is removed, the step height changes, the sheath geometry shifts and edge uniformity slowly drifts out of specification, defining the ring’s replacement interval.
Repeated heating and cooling, combined with mechanical handling during wafer transfer and maintenance, can initiate cracks or chips at the edges and contact surfaces. Fragments become a particle source and can compromise both seating and RF return, often forcing early replacement.
Particles, residue build-up or warpage beneath the ring can prevent it from sitting flat, creating inconsistent thermal contact and RF coupling. The result is asymmetric edge behaviour, localised hot spots and arcing risk that show up as repeatable signatures in edge yield maps.
The hot edge ring is typically replaced during scheduled preventive maintenance, alongside other edge consumables. Replacement should follow the tool owner’s approved procedure; the sequence below outlines the general best-practice flow:
Edge rings are high-turnover consumables, so availability and consistency matter as much as unit price. Sourcing ES2099-007 through ESCT Fab Support gives fabs a dependable, qualified alternative for keeping etch tools productive:
It frames the 300 mm wafer at the perimeter and is held at an elevated temperature so it behaves as an active extension of the wafer edge. By shaping the plasma sheath, tuning RF coupling and controlling edge temperature, it keeps etch rate and feature profiles uniform out to the outermost die.
No. ES2099-007 is supplied as a second-source new, OEM-compatible edge ring. It is manufactured to match the form, fit and function of LAM part number 716-040738-427(S1), but it is not an original OEM part and carries no OEM branding.
The “hot” designation refers to the fact that the ring is deliberately held at an elevated temperature, rather than running cold or fully grounded. Edge temperature strongly influences polymer deposition and etch by-product behaviour, so heating the ring is a key lever for controlling edge uniformity.
Replacement intervals depend on chemistry, power and wafer throughput, so they are set by each fab from RF-hour or wafer-count data and edge-metrology trends. The ring is a scheduled consumable, normally swapped during preventive maintenance once edge uniformity or erosion approaches the defined limit.
Typical indicators include drifting edge critical dimensions or etch depth, tilted profiles near the wafer edge, rising particle and defect counts, and degraded chamber-to-chamber matching. Visible thinning, chipping or cracking on inspection confirms the ring has reached the end of its useful life.
The typical lead time for ES2099-007 is 4–5 weeks. Because edge rings are consumed on a predictable cadence, we recommend maintaining safety stock and placing reorders against your preventive-maintenance schedule so that replacements are always on the shelf when a tool comes down.
The LAM Hot Edge Ring FLEX45 (OEM P/N 716-040738-427(S1), ESCT P/N ES2099-007) is a temperature-controlled edge consumable that frames the 300 mm wafer in a plasma etch chamber. By shaping the plasma sheath, managing edge temperature and providing a consistent RF return at the perimeter, it protects etch uniformity, profile control and particle performance in the most critical region of the wafer. As a wear part with a defined replacement interval, it benefits from a reliable second-source supply that holds material and dimensional consistency across a tool fleet. ESCT Fab Support offers this ring as a verified, OEM-compatible spare with a typical 4–5 week lead time to keep etch capacity productive.
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 716-040738-427(S1). 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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