3D10-201448-21
FOCUS RING 360-302-C

NEST focus ring 360-302-C (OEM P/N 3D10-201448-21), edge plasma-confinement consumable for TEL 300 mm plasma etch systems

2nd Source NEW focus ring engineered to OEM form, fit and function for Tokyo Electron etch chambers

The NEST Focus Ring 360-302-C is a precision-machined annular consumable that sits at the wafer edge inside a Tokyo Electron (TEL) 300 mm plasma etch process chamber. Identified by OEM part number 3D10-201448-21, it surrounds the 300 mm wafer where it rests on the electrostatic chuck, forming a continuous ring of material that extends the electrical and thermal boundary of the wafer outward. In doing so it directly governs how the plasma sheath behaves across the outermost few millimetres of the substrate, the region where edge etch uniformity, die yield and particle performance are hardest to control.

In a high-density etch chamber the wafer edge is an electrical discontinuity. Without a focus ring, the sheath would terminate abruptly at the wafer perimeter, bending the ion trajectories and skewing etch profiles on the last ring of dies. The 360-302-C is shaped and dimensioned to push that discontinuity off the wafer and onto the ring itself, so the sheath remains flat and the ions arrive at the wafer surface vertically right out to the edge exclusion zone.

Because it is positioned in the most aggressive part of the chamber, the focus ring is a scheduled consumable: it erodes during normal operation and must be replaced on a defined preventive-maintenance interval. The 360-302-C is supplied by ESCT Fab Support as a second-source, brand-new component manufactured to match the dimensional and material specification of the original, giving fabs a cost-effective and reliably available alternative for routine ring changes.

Functional role of the focus ring in NEST and TEL etch platforms

The focus ring is one of the few chamber parts that touches both the plasma and the immediate periphery of the wafer, which is why its geometry and electrical properties have an outsized effect on edge results. The 360-302-C performs several interdependent functions during every etch cycle:

• Extending the plasma sheath beyond the wafer perimeter so that ion incidence stays vertical and edge etch profiles do not tilt or bow.
• Shaping the local electric field to keep etch rate and critical dimensions uniform across the outer wafer ring and into the edge exclusion zone.
• Providing a sacrificial, replaceable surface that absorbs ion bombardment and erosion that would otherwise attack the electrostatic chuck or wafer carrier.
• Helping confine the plasma over the active electrode area and contributing to a consistent RF return path at the wafer edge.
• Maintaining a stable thermal boundary at the wafer rim so that edge temperature, and therefore edge etch behaviour, tracks the rest of the substrate.
• Protecting the underlying ceramic and hardware so that an inexpensive ring change, rather than a major component swap, restores edge performance.

Material and process performance

Focus rings live in a flux of energetic ions and reactive fluorine- or chlorine-based chemistry, so material selection and dimensional precision are what separate a ring that holds process for a full PM interval from one that drifts early. The 360-302-C is built to reproduce the OEM material grade and tolerances exactly.

Material and plasma resistance

Focus rings for TEL etch chambers are typically produced from high-purity silicon or a process-matched ceramic such as silicon carbide or quartz, chosen so the ring’s erosion chemistry is compatible with the etch process and does not introduce foreign species. Key material characteristics include:

• High purity to avoid metallic or particulate contamination of the wafer edge during erosion.
• Controlled resistivity so the ring couples to the RF field in the same way as the original part.
• Resistance to fluorine and chlorine chemistries and to the thermal load of a high-power plasma.
• A predictable, even erosion rate so that ring life can be scheduled against wafer count.

Dimensional and surface precision

The performance of a focus ring is set as much by its dimensions as by its material. The inner diameter, step height relative to the wafer plane and overall thickness determine where the sheath sits, so these features are held to tight tolerances on the 360-302-C:

• Precise inner diameter and concentricity so the ring centres consistently around the wafer.
• Controlled step height and flatness so the sheath transition occurs off-wafer, where it should.
• Uniform surface finish that minimises particle shedding and supports a stable erosion front.
• Consistent seating geometry so the ring makes repeatable thermal and electrical contact with the chuck assembly.

Impact on tool performance and yield

Because the focus ring controls the most marginal region of the wafer, its condition is felt directly at the metrology step and on the yield map. A worn or out-of-spec ring shows up as edge effects long before it causes an obvious chamber fault:

• Edge critical-dimension and etch-rate uniformity that drift as the ring erodes and the sheath drops.
• Tilted or bowed etch profiles on the outermost dies, reducing usable die per wafer.
• Particle excursions as the eroded surface becomes rough or begins to flake.
• Chamber-to-chamber mismatch when rings are at different points in their life, complicating process matching.
• Shortened intervals between qualification runs and more frequent recipe re-centring if rings are not changed on schedule.

Common wear and failure modes

A focus ring is designed to wear, but it must wear predictably. The failure modes below are what drive the PM interval and what to inspect for at every ring change.

Erosion and thinning

The dominant wear mode is steady erosion of the upper surface and inner edge under ion bombardment. As the ring thins, its step height relative to the wafer drops, the sheath shifts and edge etch performance gradually moves out of specification, the point at which the ring has reached end of life and must be replaced.

Cracking and chipping

Silicon and ceramic rings are brittle. Thermal cycling, mishandling during installation or arcing can initiate cracks or chip the inner edge. Fragments and the resulting rough surface become a particle source and can damage the wafer or the chuck, so any cracking warrants immediate removal.

Surface roughening and deposition

Over a campaign the ring surface can roughen or accumulate polymer and by-product deposits. Roughening accelerates particle generation, while uneven deposition disturbs the local field and undermines the edge uniformity the ring is meant to protect.

Installation and replacement guidance

Focus-ring replacement is a routine but contamination-sensitive PM task. Follow the tool owner’s documented procedure; the sequence below summarises good practice for the 360-302-C:

• Vent the chamber, confirm RF and electrostatic-chuck power are isolated and the system is safe to open.
• Remove the worn ring carefully with clean, powder-free gloves and approved tooling, avoiding contact with the chuck surface.
• Inspect and clean the seating area, the electrostatic chuck and surrounding hardware for deposits, particles or damage.
• Unpack the new 360-302-C in a clean area and inspect it for chips or shipping damage before fitting.
• Seat the ring squarely and concentrically, confirming it sits flat with no rocking and the correct step relationship to the wafer plane.
• Close and pump down the chamber, then run leak-check, seasoning and any required conditioning recipes.
• Re-qualify with monitor wafers, verify edge uniformity and particle counts, and log the ring change against the chamber’s wafer count.

Spare parts strategy for NEST and TEL etch consumables

Focus rings are consumed on a regular cadence, so availability and consistency matter as much as unit price. Sourcing the 360-302-C through ESCT Fab Support gives fabs a dependable second-source channel for this high-turnover consumable:

• Brand-new, second-source parts built to match the OEM form, fit and function of 3D10-201448-21.
• A cost-effective alternative that helps reduce the per-wafer cost of a scheduled consumable.
• A typical lead time of 4-5 weeks, supporting planned PM scheduling and buffer-stock strategies.
• Consistent material grade and machining tolerances to keep ring-to-ring and chamber-to-chamber behaviour predictable.
• A single supply partner for focus rings, edge rings, silicon electrodes and related TEL etch consumables.

Frequently asked questions

What does the 360-302-C focus ring do in the chamber?

It surrounds the 300 mm wafer at the edge and extends the plasma sheath off the wafer onto the ring, keeping ion incidence vertical and etch results uniform right out to the edge exclusion zone. It also acts as a sacrificial surface that protects the electrostatic chuck beneath it.

Is this an original OEM part?

No. It is a brand-new, second-source component supplied as an OEM-compatible alternative to NEST OEM part number 3D10-201448-21. It is manufactured to match the original part’s form, fit and function but is not an original OEM-branded item.

How often should the focus ring be replaced?

Focus rings are scheduled consumables and are replaced on a wafer-count or time-based PM interval defined by your process and erosion data. The ring should be changed once erosion has thinned it enough to shift edge etch performance out of specification, or sooner if inspection reveals cracking or excessive roughening.

What material is the ring made from?

Focus rings for TEL etch chambers are produced from high-purity, plasma-resistant materials such as silicon or a process-matched ceramic. The 360-302-C is made to the OEM material grade so its erosion chemistry, resistivity and RF coupling behave like the original part.

How will a worn ring show up in my data?

Typically as a drift in edge critical dimension and etch-rate uniformity, tilted profiles on the outer dies, and rising particle counts. Because these effects appear at the wafer edge, they are usually caught at metrology and on the yield map before any hard fault is logged.

What is the lead time for this part?

The typical lead time is 4-5 weeks. As focus rings are consumed predictably, we recommend planning orders against your PM schedule and holding appropriate buffer stock to avoid unplanned tool downtime.

Summary

The NEST Focus Ring 360-302-C (OEM P/N 3D10-201448-21) is a wafer-edge consumable for Tokyo Electron 300 mm plasma etch chambers that controls the plasma sheath, protects the electrostatic chuck and sets edge etch uniformity. Built from high-purity, plasma-resistant material to OEM dimensions and supplied brand-new as a second-source part, it offers fabs a cost-effective, consistently available option for scheduled ring changes, with a typical 4-5 week lead time to support planned maintenance.

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 Nest part number 3D10-201448-21. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Nest, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.

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