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The TEL focus ring designated “360-T3.4-FLAT” is a circular plasma-process consumable that sits concentrically around the 300 mm wafer inside a Tokyo Electron etch chamber. The name decodes into the three attributes that matter most to a process engineer: a nominal 360 mm class outer footprint that frames the wafer pocket on the lower electrode, a T3.4 designation indicating a defined ring thickness or step geometry in the 3.4 mm class, and a FLAT top-surface profile rather than a stepped or recessed contour. Together these define how the ring extends the electrostatic chuck surface beyond the wafer edge and how it shapes the plasma sheath above the outermost die.
In a TEL 300 mm capacitively coupled etch chamber, the focus ring is mounted on the cathode assembly, surrounding the wafer and resting on the dielectric and grounding hardware that complete the lower-electrode stack. Because it is a sacrificial part directly exposed to the same fluorocarbon, oxygen and inert-gas plasmas that etch the wafer, it erodes continuously throughout production. As it thins, the local sheath geometry and ion trajectories at the wafer edge change, so the focus ring is one of the highest-turnover consumables in the chamber and a routine line item in preventive maintenance kits.
A flat-profile ring of this thickness class is typically specified where the process recipe needs a predictable, uniform extension of the plasma boundary right up to the wafer perimeter, without the deliberate ion-steering bias that a stepped profile introduces. Maintaining the correct flat top surface and thickness is therefore central to keeping edge etch rate, profile angle and critical-dimension control inside specification across the full 300 mm field.
The focus ring is not a passive spacer; it is an active participant in the electrical and physical environment at the wafer edge. By presenting a controlled dielectric and conductive boundary just outside the wafer, it determines how the plasma sheath bends as it reaches the perimeter, and that bending dictates whether the outermost die etch with the same profile as die at the wafer centre. Its principal functions include the following.
Focus rings for TEL etch chambers are manufactured from high-purity process-compatible materials selected for predictable erosion behaviour and low particle generation. Depending on the recipe family, rings in this class are produced from high-purity silicon, silicon carbide or quartz, with tightly controlled bulk purity and surface finish so that the material does not introduce metallic or particulate contamination into the wafer environment as it wears.
For a flat-profile ring the dimensional tolerances are unforgiving, because the flat top surface and the T3.4-class thickness directly set the sheath geometry at the wafer edge. Small deviations in thickness, flatness or inner-diameter concentricity translate into measurable shifts in edge etch rate and profile.
Because the focus ring governs conditions at the very edge of the wafer, its condition feeds directly into yield, particularly for the high-value outer ring of die on a 300 mm substrate. A worn or out-of-specification ring degrades results in ways that are often first detected as edge-of-wafer failures.
The dominant wear mode is steady erosion of the flat top surface by ion bombardment and chemical attack. As the T3.4 thickness reduces over thousands of RF hours, the sheath at the wafer edge drops and ion trajectories tilt, gradually pushing edge profile and critical dimension out of specification until the ring is replaced at its end-of-life threshold.
Repeated heating and cooling, combined with the brittleness of silicon, silicon carbide or quartz, can drive micro-cracking or outright fracture, especially around thin sections or where the ring is clamped. A cracked ring sheds particles, distorts the local field and can fail catastrophically during a cycle, forcing an unscheduled chamber-open.
Polymer and by-product films deposit on the ring during processing. If this build-up flakes, it becomes a particle source; if it accumulates unevenly, it perturbs the edge field. Handling residue, fingerprints or improper cleaning can also leave contamination that out-gasses or sputters onto the wafer, so rings must be installed clean and handled only with proper precautions.
Focus-ring replacement is a routine but precision preventive-maintenance task. Always follow the applicable TEL maintenance procedure and your fab’s safety and contamination-control protocols; the sequence below is a general guide.
Focus rings are consumed continuously, so a reliable, well-priced second source is central to keeping TEL etch chambers running without inflating cost of ownership. ESCT Fab Support supplies ES7099-190 as a new, form-fit-function alternative to TEL 2L10-251877-11, giving fabs flexibility alongside their OEM channel.
It describes the ring’s key physical attributes: a 360 mm class footprint that frames the 300 mm wafer pocket, a T3.4-class thickness or step dimension, and a flat top-surface profile rather than a stepped one. These set how the ring extends the electrode and shapes the plasma sheath at the wafer edge.
No. ES7099-190 is a new, second-source part supplied as an OEM-compatible equivalent to TEL 2L10-251877-11. It is verified to match the original in form, fit and function, but it is not an original Tokyo Electron OEM part and is not sold as one.
Life depends on the recipe, RF power and duty cycle, so it is best tracked by accumulated RF hours and edge-performance metrics rather than a fixed calendar. The ring is replaced once erosion drops it below its thickness threshold or once edge uniformity and particle data move out of specification.
As the flat surface erodes and the ring thins, the edge sheath drops and ion angles tilt, causing edge critical-dimension drift, profile tilting and loss of within-wafer uniformity. Worn rings also raise particle counts, so edge-of-wafer die are usually the first to fail.
Rings in this class are produced from high-purity process-compatible materials such as silicon, silicon carbide or quartz, chosen for predictable erosion and low contamination. The ES7099-190 material set is matched to the original part so that erosion behaviour and electrical properties stay consistent with the qualified process.
Typical lead time is 4-5 weeks. Because focus rings are consumed on a predictable cycle, most fabs hold buffer stock sized to their PM interval and replenish against this lead time so a chamber is never held waiting for an edge ring.
The TEL focus ring 360-T3.4-FLAT (OEM P/N 2L10-251877-11), supplied by ESCT Fab Support as ES7099-190, is a flat-profile, 360 mm class, T3.4 thickness consumable that surrounds the 300 mm wafer on the lower electrode of a TEL plasma etch chamber. It extends the electrode, confines and shapes the edge plasma, provides a controlled RF return and acts as a sacrificial barrier protecting costly chamber hardware. Because it erodes continuously and directly controls edge etch uniformity, profile and particle performance, it is a high-turnover part where dimensional accuracy, material quality and dependable supply all matter. As a new, second-source, form-fit-function equivalent with a 4-5 week lead time, ES7099-190 helps fabs sustain edge yield while managing cost of ownership and single-source risk.
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 Tokyo Electron part number 2L10-251877-11. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Tokyo Electron, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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