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The Indexer Motor Assembly, identified by Applied Materials part number 0090-20004 and supplied by ESCT Fab Support as ES1044-018, is the powered drive unit responsible for the precise, repeatable rotational or linear stepping motion of an indexing mechanism on AMAT etch and CVD platforms. An indexer is a mechanism that advances a payload, typically a cassette of wafers, a load-port carrier, an elevator stack, or a rotary station, through a series of discrete, accurately defined positions. The motor assembly is the actuator that converts electrical drive commands into that controlled, position-by-position motion.
As a self-contained assembly, this part bundles the electric motor with its associated mounting interface, drive shaft or output coupling, and, depending on the variant, an integral gearhead, brake, or feedback device such as an encoder or tachometer. It sits within the tool’s wafer-handling or material-transport subsystem, mechanically coupled to a lead screw, belt, pinion, or index plate that physically moves the payload. In a fab where every handling cycle must place a wafer in exactly the right plane for transfer, the indexer motor is the component that guarantees each step lands where the controller expects.
Because indexing motion is tightly bound to wafer-transfer timing and positional accuracy, a degraded or failed indexer motor does not simply slow the tool, it can stall a transfer sequence, mis-position a wafer at a handoff, or trip the tool into a fault state that halts production. Keeping a verified replacement on the shelf is therefore a sensible part of any AMAT maintenance strategy, and that is precisely the role ES1044-018 is intended to fill.
Within the material-handling architecture of an AMAT system, the indexer motor assembly provides the motive power and positional control for stepping a payload through defined increments. It works in concert with the tool’s motion controller, position sensors, and mechanical transmission to deliver motion that is both accurate and repeatable across millions of cycles. Its principal functions include the following.
Because the indexer motor is a motion-producing assembly that operates continuously through a fab tool’s duty cycle, its value lies in mechanical precision sustained over high cycle counts. Two performance domains matter most: how accurately it positions, and how durably it transmits torque.
The assembly must arrive at each commanded index position with minimal error and return to that position consistently. Backlash in any integral gearing, compliance in the coupling, and feedback resolution all set the floor on achievable accuracy.
The motor and any gearhead must deliver sufficient torque to accelerate, move and decelerate the payload smoothly, while bearings, couplings and windings withstand sustained operation without overheating or wearing prematurely.
Although the indexer motor is upstream of the process chamber, its reliability propagates directly into throughput and, indirectly, into yield. A handling actuator that mis-steps or stalls disrupts the carefully sequenced flow of wafers through the tool, and the downstream consequences accumulate quickly.
Like any electromechanical actuator under sustained cyclic duty, the indexer motor assembly degrades along predictable paths. Recognising the early symptoms allows planned replacement before an in-process failure.
High cycle counts wear motor and gearhead bearings, introducing play, audible noise, increased friction and rising current draw. Worn bearings raise backlash and degrade positional repeatability, eventually leading to rough or seized motion.
Insulation breakdown, thermal stress, or contamination can cause winding shorts, open phases, or intermittent connections. The result is reduced torque, overheating, erratic motion, or a complete failure to drive, often flagged by the controller as an over-current or motion fault.
Where an integral encoder, tachometer or brake is fitted, contamination, signal degradation or component wear can corrupt feedback or weaken holding. The controller then reports position-error or following-error faults, loses confidence in the index position, and may halt the handling sequence to protect the wafer.
Replacement should be carried out by a qualified technician following the relevant AMAT service documentation for the specific tool and handling module. The motor must be aligned and coupled correctly, and the index position re-referenced before the tool is returned to production. The general sequence is as follows.
Motion actuators such as the indexer motor are exactly the kind of component that benefits from a stocked, qualified replacement: they are subject to wear, their failure stops the tool, and OEM lead times can be long. Sourcing ES1044-018 through ESCT Fab Support gives fab maintenance and procurement teams a dependable alternative.
It is the powered drive that steps an indexing mechanism (such as a cassette, elevator, or rotary station in the wafer-handling subsystem) through a series of accurately defined positions, converting controller commands into controlled, repeatable motion at the output shaft.
No. This is not an original OEM part. It is supplied as a new, OEM-compatible assembly cross-referenced to AMAT part number 0090-20004 and verified to match the original in form, fit and function, so it serves as a direct replacement.
Match the AMAT OEM number 0090-20004 and the ESCT number ES1044-018 against your tool’s spare-parts list and the existing assembly’s identification. If you are unsure of the configuration in your specific handling module, our team can help confirm suitability before you order.
The current lead time for ES1044-018 is approximately four weeks. We recommend factoring this into your planned maintenance schedule and holding a unit in your critical-spares pool given the tool-down impact of an unplanned indexer motor failure.
Watch for increasing noise or vibration, rough or hesitant index motion, rising current draw, intermittent motion or position faults at the controller, and degraded positional repeatability. These typically precede a hard failure and are good triggers for planned replacement.
Yes. After fitting, the index position should be re-referenced or homed and the assembly checked through controlled, payload-free cycles per the relevant AMAT service procedure to confirm correct positioning and a clean fault status before the tool returns to production.
The Indexer Motor Assembly (AMAT OEM P/N 0090-20004, ESCT P/N ES1044-018) is the electromechanical drive that steps the wafer- or cassette-handling indexer through its defined positions on AMAT etch and CVD platforms. Its accuracy, torque delivery and durability directly underpin reliable wafer transfer and tool throughput, while its predictable wear and failure modes make it a strong candidate for a stocked, qualified spare. Supplied as a new, OEM-compatible assembly verified to form, fit and function, with a four-week lead time, ES1044-018 offers fabs a dependable replacement that keeps handling sequences running.
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 0090-20004. 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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