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The Focus Resistor Unit (OEM P/N 0090-90217) is a high-voltage resistive assembly used within the extraction and beam-optics section of Applied Materials (AMAT) Quantum and xR-class ion implantation systems. Its role is to define, divide and stabilise the electrical potential applied to the focus electrode of the ion-extraction column, so that the ion beam emerging from the source is shaped and converged correctly before it enters the analyser magnet and beamline. In an implanter, the difference of a few hundred volts across this resistive network translates directly into the geometry of the extracted beam, so the unit sits at the boundary between raw high-voltage power conditioning and precision beam control.
Physically, the unit is a packaged string of high-voltage, high-power resistors, typically wirewound or thick-film ceramic elements, mounted on an insulating carrier and terminated with the connectors and standoffs needed to operate safely at the tens-of-kilovolt potentials present in the source terminal. It forms part of the divider and ballast circuitry that links the extraction supply, the focus supply and the source housing, bleeding and apportioning current so that the focus electrode holds a controlled fraction of the total extraction potential. Because it lives in the high-voltage terminal alongside the source, it is exposed to heat, vacuum-adjacent outgassing, ion bombardment by-products and the cumulative electrical stress of continuous production.
When the Focus Resistor Unit drifts in value or fails, the symptoms are rarely a clean stop. Instead, the fab sees beam-tuning difficulties, unstable focus voltage, dose-uniformity excursions and arcing in the source terminal, all of which erode tool availability and put wafers at risk. Keeping a known-good replacement on the shelf is therefore a practical safeguard against extended high-voltage troubleshooting.
In an ion implanter, ions are pulled from the source plasma by a high-voltage extraction field and then shaped by one or more focus electrodes before analysis. The Focus Resistor Unit is the passive network that conditions and divides the voltages feeding that focus optics, performing several interlocking jobs:
Because the focus geometry depends directly on voltage ratios, the electrical behaviour of this resistor unit is the heart of its value. Two characteristics matter most: how accurately and stably it holds its resistance, and how reliably it withstands the high-voltage environment.
The divider ratio set by the resistor string determines the focus electrode potential, so tolerance, temperature coefficient and long-term drift all feed straight into beam reproducibility. A well-matched, low-drift assembly lets the implanter return to the same tune after a source service; a drifting one forces constant re-optimisation.
Operating in the source terminal, the unit must survive sustained kilovolt-scale potentials, repeated arc transients and the power dissipation that flows through the divider. Adequate voltage rating, surface creepage and thermal dissipation are what separate a long-lived unit from one that flashes over.
The focus circuit sits upstream of every wafer the implanter processes, so a degraded resistor unit propagates errors across the whole beamline. The consequences of letting it drift or fail include:
Prolonged high-voltage and thermal stress can shift individual resistor values or open an element entirely. A single open or drifted element changes the divider ratio, shifting the focus potential and forcing the beam off its established tune, often appearing as a gradual, hard-to-localise degradation rather than a hard fault.
Contamination, outgassing residue and moisture can create conductive tracks across the insulating carrier and standoffs. Once tracking begins, leakage current and flashover follow, producing erratic focus voltage, audible arcing and protective trips of the high-voltage supplies.
Repeated heating and cooling fatigues solder joints, terminations and mountings. Loose or high-resistance connections raise local heating, accelerate drift and can intermittently interrupt the divider path, giving rise to flickering or unstable focus readings during operation.
Because this unit operates at lethal potentials inside the source terminal, replacement must be carried out only by suitably trained personnel following AMAT lockout, high-voltage discharge and grounding procedures. The following sequence outlines a typical replacement:
High-voltage passive assemblies like the focus resistor unit are easy to overlook in a spares plan precisely because they fail slowly and intermittently, until they trigger a yield event. ESCT Fab Support helps fabs keep this part available and serviceable:
It is a high-voltage resistive divider and ballast assembly that conditions and apportions the voltage feeding the focus electrode of the ion-extraction column, helping shape and converge the extracted beam and stabilise the high-voltage supplies.
No. This is supplied as an OEM-compatible part verified to the form, fit and function of AMAT P/N 0090-90217. It is not an original OEM component and is not sold as one; it is offered as a compatible alternative under ESCT P/N ES3033-114.
Typical signs are unstable or drifting focus voltage, difficulty holding a beam tune, dose or uniformity excursions, and arcing or protective trips in the source terminal. These often appear gradually before becoming a hard fault.
It is used in the extraction and beam-optics circuitry of AMAT Quantum and xR-class ion implantation systems. Confirm the specific configuration against your source-terminal layout, as ESCT can help match the correct assembly.
Only trained personnel should attempt this. The unit sits at lethal potentials inside the source terminal, so AMAT lockout, high-voltage discharge and grounding procedures must be followed before any access or handling.
Because the failure mode is slow and intermittent, a degraded unit can quietly cost yield and uptime while engineers chase the symptom. A shelf spare turns a multi-day high-voltage investigation into a planned swap.
The Focus Resistor Unit (AMAT P/N 0090-90217, ESCT P/N ES3033-114) is a high-voltage divider and ballast assembly that sets the focus-electrode potential in the extraction column of AMAT Quantum and xR-class ion implanters. By holding an accurate, stable resistance under demanding high-voltage and thermal conditions, it underpins beam shape, convergence and dose reproducibility. As it ages it tends to drift, track or develop intermittent connections, faults that are disproportionately costly to diagnose. Holding an ESCT OEM-compatible replacement on hand protects both yield and availability.
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 Applied Materials part number 0090-90217. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Applied Materials, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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