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The Suppression Power Supply, Applied Materials OEM part number 0090-90461, is a precision DC bias module used in the beamline and dose-measurement subsystems of AMAT ion implantation platforms. Its job is to apply a stable, well-regulated negative potential to electron suppression electrodes, the electrodes positioned ahead of Faraday cups, dose cups and beam-current collectors. By holding these electrodes at a controlled negative bias relative to the collector, the supply forms an electrostatic barrier that pushes secondary electrons back toward the surface that emitted them, so the current the system measures is the true ion beam current and not a corrupted signal contaminated by electron loss or gain.
In an implanter, dose accuracy is everything. When an energetic ion beam strikes a Faraday collector or a wafer surface, it knocks loose secondary electrons. If those electrons are allowed to leave the collector, the charge integrator reads a higher current than the beam actually delivered; if stray electrons drift in from elsewhere, it reads lower. Either way the dosimetry drifts. The suppression supply, sitting behind ESCT P/N ES3033-140, is the component that quietly prevents that error by maintaining the suppression field at a constant set point throughout every implant.
Because the module feeds the closed-loop dose control electronics rather than simply powering a motor or heater, its stability, low ripple and accurate set-point tracking translate directly into repeatable implant dose, uniform device threshold voltages and consistent yield. A failing or drifting suppression supply is one of the more insidious faults on an implanter precisely because the tool keeps running, it simply runs out of specification.
Within the implanter the suppression power supply is a small but critical link between the high-voltage control rack and the dose-measurement hardware in the end station and beamline. It performs several distinct functions:
The defining characteristic of a suppression supply is the steadiness of its output. The suppression electrode must sit at a known negative potential, typically a few hundred volts, and hold it regardless of the small, fluctuating electron current it draws. The module’s regulator loop, reference and output filtering work together to keep ripple and drift low so the suppression field never collapses far enough to let secondary electrons escape, nor swings so far that it disturbs the beam optics near the collector.
Operating around energetic beams and high-voltage collectors, the supply must protect itself and the dose electronics from arcs and faults. Its output stage, isolation barriers and protection circuitry are designed to survive the electrical environment of the beamline while still presenting clean monitoring signals to the control system.
Because suppression bias underpins the integrity of the dose measurement, the health of this supply has direct consequences for process results and fab output:
Ageing reference components, electrolytic capacitor degradation and thermal stress gradually pull the output away from its set point. The supply still produces a voltage, so the tool keeps running, but the suppression field is now slightly wrong and dosimetry drifts, the classic silent fault that shows up only in device electrical test or as a yield trend.
Repeated beam strikes and collector arcing send transient energy back into the output stage. Over time this stresses the protection devices, output transistors and isolation, eventually leading to ripple increase, nuisance trips, or an output that folds back or shuts down under load.
High-voltage connectors and harnesses in the beamline accumulate contamination, corona tracking and mechanical fatigue. Intermittent connections or a failed enable/monitor line can present as an unstable suppression voltage or a supply that refuses to enable, even when the module itself is sound, so cabling should always be checked alongside the unit.
Replacement should be carried out by a qualified implant technician following AMAT lockout/tagout and high-voltage safety procedures. A typical sequence is:
Suppression supplies sit on the critical dosimetry path, so a failure can quietly compromise an entire lot. Holding a verified replacement on the shelf protects both uptime and yield. Sourcing ES3033-140 through ESCT Fab Support offers several advantages:
It applies a regulated negative bias to the electron suppression electrode in front of the implanter’s Faraday cup or dose collector. That bias repels secondary electrons back onto the collector so the integrated charge reflects the true ion beam current, keeping the dose measurement accurate.
No. ESCT P/N ES3033-140 is supplied as an OEM-compatible replacement for AMAT P/N 0090-90461. It is verified to match the original in form, fit and function, but it is not an original OEM-branded part and is not sold as such.
Watch for dose drift or yield excursions that recipe checks cannot explain, increased dose-uniformity scatter, intermittent dose faults or beam aborts, and out-of-tolerance suppression-voltage readback. Because the supply can keep producing a voltage while drifting off set point, electrical-test trends are often the first clue.
The part is intended as a direct replacement for the AMAT suppression supply carrying OEM P/N 0090-90461 on Quantum / xR-class ion implantation systems. Confirm the OEM part number on your existing module and your tool’s dosimetry configuration before ordering, and contact ESCT if you need help verifying compatibility.
After fitting, verify the suppression output voltage and ripple against the tool specification using the diagnostic readback, confirm interlocks and enable behaviour, then run a beam-current and dose verification to confirm Faraday and dose-cup readings track expectation before returning to production.
Even a modest, persistent suppression error becomes a systematic dose bias applied to every wafer. That shifts device parameters and can quietly erode yield across many lots before it is caught, which is far costlier than maintaining a correctly regulated supply.
The Suppression Power Supply (AMAT OEM P/N 0090-90461, ESCT P/N ES3033-140) is a precision negative-bias module that holds the electron suppression electrode at a stable potential so the implanter’s Faraday and dose collectors measure true beam current. Its low ripple, tight regulation and solid protection circuitry make it a quiet guardian of dose accuracy and yield on AMAT Quantum / xR-class ion implantation systems. Because a drifting suppression supply fails silently, keeping a verified replacement on hand is a sound spares strategy for any fab running these tools.
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 0090-90461. 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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