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The Filament Power Supply, Applied Materials OEM part number 1140-90086, is the dedicated low-voltage, high-current regulated supply that energises the thermionic filament inside the ion source of AMAT Quantum and xR-class ion implanters. In a hot-filament (Bernas-style or indirectly heated cathode) source, a tungsten filament must be raised to incandescent temperature so that it emits the electron flux needed to ionise the process gas. This supply provides the tightly controlled heating current that sets that filament temperature, and through it the electron emission, arc behaviour and ultimately the beam current available to the implant recipe.
Electrically, the filament supply sits at the heart of the source power chain, sandwiched between the high-voltage terminal (where the source floats at the extraction/acceleration potential) and the arc and extraction supplies that complete the source operating set. It is characterised by a deliberately low output voltage, typically only a few volts across the filament, combined with very high current, often tens of amperes, because a cold tungsten filament presents a very low resistance and must be driven hard to reach emission temperature. Stability and repeatability of this current are paramount: even small drifts translate directly into beam-current drift on the wafer.
Because the ion source is a consumable-rich, thermally punishing environment, the filament supply is one of the harder-working power assemblies in the implanter. It is asked to start cold filaments, ramp them in a controlled fashion, hold a regulated current against changing filament resistance as the tungsten ages, and survive the electrical noise of an arc discharge floating at high potential. Keeping a verified spare of 1140-90086 on the shelf is a direct safeguard against the most common cause of unplanned source downtime.
Within the source subsystem, the filament supply does far more than simply pass current. It is an actively regulated element of the closed-loop source control scheme, responding to commands from the implanter’s source controller and reporting back its operating state. Its principal functions include:
The defining electrical characteristic of 1140-90086 is high-current, low-voltage regulated output. Because filament emission is exponentially sensitive to temperature, the supply must hold its set current with tight tolerance and low ripple; otherwise the electron emission, and therefore the arc and beam, will wander. Good supplies achieve this through solid current-mode regulation, low-impedance output paths and feedback sensing taken close to the filament terminals.
The filament output floats at the source’s high extraction potential, so galvanic isolation from the input side is required, as is immunity to the broadband electrical noise generated by the arc discharge and by extraction arcing events. The internal power devices, magnetics and control electronics must tolerate this hostile environment while still delivering clean regulation.
Because filament temperature governs electron emission, and emission governs beam current, the performance of this supply is felt directly at the wafer. A drifting or marginal filament supply does not always fail outright; it can quietly degrade implant quality long before it trips an alarm. The downstream consequences include:
The high-current power stage (switching devices, rectifiers, output magnetics and bulk capacitors) carries the heaviest thermal and electrical load in the unit. Over thousands of source cycles, capacitor electrolyte dries out, solder joints on high-current paths fatigue, and power semiconductors degrade, producing rising ripple, regulation drift, or eventual loss of output.
At tens of amperes, even a small increase in connector or terminal resistance produces real voltage drop, localised heating and discolouration. Loose, oxidised or arc-pitted filament terminals can mimic a supply fault, cause erratic current readings, and in the worst case overheat the connection. Many apparent supply failures trace back to the high-current interface rather than the electronics themselves.
Faults in the current-sense path or control electronics cause the supply to regulate to the wrong set point, while degradation of isolation barriers under repeated high-voltage stress can lead to insulation breakdown, nuisance interlock trips or unsafe leakage. Persistent arc-noise exposure can also corrupt feedback signals, making the output appear unstable even when the power stage is healthy.
Filament supplies operate at lethal potentials within the source cabinet, so replacement must follow the full lock-out/tag-out and high-voltage discharge procedures defined in the AMAT service documentation. The general sequence is:
Source power supplies are exactly the kind of long-lead, high-impact assembly that benefits from a planned spares position rather than reactive sourcing. ESCT Fab Support supplies 1140-90086 (ESCT P/N ES3033-124) as a form-, fit- and function-verified alternative, helping fabs keep beam time productive without overpaying or waiting on extended OEM channels. Advantages include:
It provides the regulated, high-current, low-voltage output that heats the tungsten filament in the ion source to incandescence. That heating produces the thermionic electron emission needed to ionise the process gas and strike the arc, which in turn sets the beam current used for the implant.
No. This item is supplied as an OEM-compatible part. It is verified to the form, fit and function of AMAT OEM P/N 1140-90086 and is intended as a direct functional alternative, but it is not an original Applied Materials branded part and is not sold as such.
A tungsten filament has very low resistance, especially when cold, so reaching emission temperature requires driving a large current through a small voltage. The supply is therefore optimised for stable high-current delivery and low-impedance output rather than high voltage.
Symptoms can overlap, so check the high-current connections first: oxidised or loose terminals often mimic a supply fault. If the connections are sound and the supply still cannot hold its set current or shows excess ripple, the power stage or control electronics are the likely cause and replacement is warranted.
Yes. After any change to a source power supply you should re-tune the source and confirm regulated filament current and stable beam current at your implant set points, confirming dose uniformity is within specification before returning the tool to production.
Considerably. Filament supplies are critical to source operation and can carry long replacement lead times. Holding a verified ES3033-124 spare means a faulted unit can be swapped during a planned source service window rather than triggering an extended, unplanned tool stoppage.
The Filament Power Supply, AMAT OEM P/N 1140-90086 (ESCT P/N ES3033-124), is the regulated high-current heating supply that drives the source filament in AMAT Quantum and xR-class ion implanters. By holding filament current stable against a changing, low-resistance load while floating at the source high-voltage potential, it underpins consistent electron emission, arc stability and beam current, and therefore implant dose uniformity and yield. Its high thermal and electrical duty makes it a prime candidate for a planned critical spare, and ESCT Fab Support offers it as a verified, cost-effective alternative to keep beam time productive.
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 1140-90086. 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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