716-040738-120
HOT EDGE RING FLEX45(GRINDING)

Hot edge ring FLEX45 (OEM P/N 716-040738-120), plasma-exposed edge ring for LAM 300 mm etch systems

ESCT P/N ES2099-026, second-source NEW hot edge ring, ground finish

The Hot Edge Ring FLEX45 (LAM OEM P/N 716-040738-120) is a plasma-facing consumable ring used at the wafer perimeter inside the etch chamber of LAM FLEX-series 300 mm process tools. The “grinding” notation in the raw part description denotes the ground surface finish applied to the ring during manufacture, which controls dimensional flatness, edge geometry and the consistency of the plasma-exposed face. As a hot edge ring, it operates within the heated zone immediately surrounding the electrostatic chuck, where it must withstand sustained ion bombardment, reactive fluorine and chlorine chemistries and elevated surface temperatures throughout each etch cycle.

In a 300 mm plasma etch chamber, the edge ring is one of the most influential consumables governing the quality of the outermost few millimetres of every wafer. It surrounds the wafer, extends the effective electrical and thermal boundary of the chuck past the wafer edge, and shapes the way the plasma sheath bends as it approaches the wafer perimeter. Because so much of a 300 mm wafer’s printed area sits near the edge, the condition of this single ring has a disproportionate effect on edge die yield and overall tool productivity.

ESCT Fab Support supplies this part as a second-source NEW component (ESCT P/N ES2099-026), verified to the form, fit and function of the LAM original, with a typical lead time of four to five weeks. It is intended as a maintenance-cycle replacement consumable to be installed during scheduled preventive maintenance when the incumbent ring has reached its erosion limit.

Functional role of the hot edge ring in LAM FLEX etch platforms

The hot edge ring sits concentrically around the wafer on the lower electrode assembly, bridging the gap between the wafer edge and the surrounding chamber hardware. Its job is to make the wafer “see” a uniform electrical and thermal environment right out to its physical boundary, so that etch behaviour at the edge mirrors etch behaviour at the centre. The principal functions include:

• Extending the RF and plasma-coupling field beyond the wafer edge so the plasma sheath remains parallel to the wafer surface, keeping etch features vertical at the perimeter.
• Tuning the sheath shape and ion-angle distribution at the wafer edge to suppress tilting, striation and edge roll-off of etched profiles.
• Defining the radial boundary of the active etch zone and confining the plasma over the wafer for repeatable edge etch rates.
• Providing a sacrificial, plasma-exposed surface that erodes in place of more costly chamber hardware and the chuck itself.
• Contributing to the thermal boundary at the wafer edge, helping stabilise edge temperature and therefore edge critical dimension.
• Maintaining a controlled gap and step relative to the wafer plane to minimise polymer accumulation and particle generation at the perimeter.

Material and process performance

Erosion and plasma resistance

Edge rings of this class are manufactured from process-grade consumable materials selected for predictable, low-particle erosion under aggressive plasma chemistries, commonly high-purity silicon, silicon carbide or comparable etch-resistant materials matched to the chamber process. The ground surface finish referenced in the part name gives a flat, controlled exposed face and consistent edge geometry, both of which directly influence how the sheath behaves and how uniformly the ring wears. A surface that erodes evenly preserves etch uniformity over a longer service interval.

• High purity to avoid introducing metallic or particulate contamination into the etch environment.
• Resistance to fluorine- and chlorine-based plasma chemistries used in dielectric, polysilicon and conductor etch.
• Predictable, gradual erosion that allows a defined replacement interval rather than abrupt failure.

Dimensional and thermal stability

Because the ring sits in the heated zone of the chuck, it must hold its dimensions and seat correctly across the full operating temperature range without warping or cracking. Tight control of flatness, parallelism and inner-diameter geometry keeps the wafer-to-ring step within specification, which gives stable edge etch results. The ground finish supports the flatness and seating consistency needed for repeatable thermal contact.

• Controlled flatness and parallelism for repeatable seating on the lower electrode.
• Thermal stability that resists distortion across rapid heating and cooling cycles.
• Precise inner diameter and step height to maintain the designed wafer-to-ring relationship.

Impact on tool performance and yield

As the hot edge ring erodes, the plasma sheath at the wafer edge gradually changes shape, shifting ion angles and etch rates in the outer annulus of the wafer. Left unaddressed, this drift erodes yield from the very region that holds the most die. The consequences of a worn or out-of-specification ring include:

• Edge-to-centre etch-rate non-uniformity that pushes edge critical dimensions outside the process window.
• Profile tilting and feature distortion in the outermost die, reducing usable edge yield.
• Increased particle counts as the eroded surface roughens and polymer flakes shed.
• Process drift that forces more frequent recipe re-centring and additional qualification wafers.
• Unplanned downtime if the ring is run beyond its erosion limit to the point of damage.

Common wear and failure modes

Surface erosion and thinning

The dominant failure mode is steady plasma erosion of the exposed face. As material is removed, the ring thins and its top surface drops relative to the wafer, altering sheath geometry at the edge and progressively degrading edge etch uniformity until the ring reaches its replacement threshold.

Cracking and chipping

Repeated thermal cycling, mechanical handling and localised hot spots can cause cracks or edge chips. A cracked ring is an immediate particle source and a risk to wafers and chamber hardware, and it must be replaced without delay rather than run to its nominal erosion limit.

Polymer build-up and contamination

Etch by-products and polymer can accumulate on and around the ring, especially as the surface roughens with age. This build-up shifts the local electrical and thermal environment and can flake during subsequent runs, driving defectivity excursions at the wafer edge.

Installation and replacement guidance

The hot edge ring is replaced during scheduled preventive maintenance, typically alongside other perimeter consumables. Always follow the applicable LAM maintenance procedure and your fab’s safety protocols; the following sequence is a general guide only:

• Vent the chamber and confirm it has cooled and is fully isolated and locked out before opening.
• Don clean-room gloves and handle the new ring only by approved means to avoid contaminating the plasma-exposed surface.
• Remove the worn edge ring, noting its orientation, and inspect the chuck and seating area for residue, debris or damage.
• Clean the seating surface per procedure so the new ring beds flat with full, even contact.
• Unpack the new ring (ES2099-026), inspect for shipping damage, and seat it in the correct orientation, confirming it sits flush without rocking.
• Close the chamber, pump down and perform any required leak-up and seasoning or conditioning runs.
• Run qualification wafers and verify edge etch uniformity and particle performance before returning the tool to production.

Spare parts strategy for LAM etch consumables

Edge rings are scheduled-replacement consumables, so holding qualified stock is central to keeping etch tools in production. Sourcing verified second-source rings such as ES2099-026 lets fabs protect uptime and manage cost without compromising edge performance. ESCT Fab Support offers:

• Second-source NEW parts verified to the form, fit and function of the LAM original.
• A clear four-to-five-week lead time to support planned preventive-maintenance scheduling.
• Cost relief versus original OEM consumable pricing across high-volume edge-ring usage.
• Cross-referencing by both OEM P/N (716-040738-120) and ESCT P/N (ES2099-026) for accurate ordering.
• Support for consolidating perimeter consumables into a single, reliable supply relationship.

Frequently asked questions

What does the FLEX45 hot edge ring actually do?

It is a plasma-exposed consumable ring that surrounds the wafer on the lower electrode, extending the electrical and thermal boundary of the chuck past the wafer edge. This keeps the plasma sheath parallel to the wafer surface at the perimeter so edge etch profiles and rates match those at the wafer centre.

Is this an original LAM OEM part?

No. This is supplied as a second-source NEW component (ESCT P/N ES2099-026), manufactured and verified to match the form, fit and function of LAM OEM P/N 716-040738-120. It is not an original OEM part and is offered as a compatible replacement consumable.

What does “(grinding)” in the part name mean?

It refers to the ground surface finish applied during manufacture. Grinding produces the flat, dimensionally controlled exposed face and edge geometry the ring needs for consistent seating, even erosion and predictable sheath behaviour at the wafer edge.

How do I know when the edge ring needs replacing?

The ring is typically replaced on a defined preventive-maintenance interval based on erosion or accumulated process hours. Drifting edge etch uniformity, rising edge particle counts or visible thinning, cracking or chipping are all signs that the ring has reached or passed its useful life and should be changed.

What is the lead time for ES2099-026?

The typical lead time is four to five weeks. Because edge rings are consumed on a predictable schedule, we recommend ordering against your maintenance plan and maintaining buffer stock to avoid unplanned tool downtime.

Will fitting a second-source ring affect my process?

When verified to the original’s form, fit and function and installed correctly, a second-source ring is intended to behave equivalently to the OEM part. As with any consumable change, we recommend running your standard qualification and particle checks after installation before returning the tool to production.

Summary

The Hot Edge Ring FLEX45 (LAM OEM P/N 716-040738-120, ESCT P/N ES2099-026) is a ground-finish, plasma-exposed consumable that governs edge etch uniformity, sheath shaping and particle performance at the wafer perimeter in LAM FLEX-series 300 mm etch chambers. As a sacrificial component subject to steady erosion, it requires scheduled replacement to hold edge yield and process stability. Supplied as a second-source NEW part on a four-to-five-week lead time, ES2099-026 gives fabs a verified, cost-effective way to keep etch tools running without compromising edge performance.

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.

Related parts

• 716-040738-120, HOT EDGE RING FLEX45(4.5T GRINDING)
• 716-040738-120, HOT EDGE RING FLEX45(L)
• 716-040738-120, HOT EDGE RING FLEX45(LAPPING)
• 716-040738-120, (C2)HOT EDGE RING FLEX45
• 716-040738-120, (C2)HOT EDGE RING FLEX45(CP22.5um)
• 716-040738-120, HOT EDGE RING FLEX45(POLISHING)
• 716-040738-120, (C2)HOT EDGE RING FLEX45(MID)
• 716-040738-120, HOT EDGE RING FLEX45