What Is an Electrostatic Chuck? Types & Buyer Checks
Understand electrostatic chuck types, then check replacement fit, inspection records and acceptance criteria before buying a used ESC.
An electrostatic chuck holds a workpiece using electrostatic force. When buying a replacement ESC, match the installed assembly and process requirements, confirm the documented chucking mechanism and interfaces, and agree on inspection evidence and an acceptance plan before ordering.
What does an electrostatic chuck do?
An electrostatic chuck (ESC) holds a workpiece using electrostatic force. Voltage applied to electrodes inside the chuck induces charge separation in the workpiece, creating attraction to the chuck surface.
ESC applications include semiconductor etching, ashing, CVD and PVD equipment.
For a replacement purchase, start with the installed assembly's identity and your process requirements. Ask the seller to document the proposed match before comparing quotes. Treat the checklist below as a purchasing workflow, not a substitute for the tool's approved service procedure.
Coulomb vs Johnsen–Rahbek ESC: which chucking mechanism do you have?
A Coulomb-type ESC uses an insulating dielectric. A Johnsen–Rahbek (JR) type uses a slightly conductive dielectric, with a small leakage current at the workpiece–chuck interface contributing to attraction.
SHINKO lists alumina ceramic chucks in both Coulomb-force and Johnsen–Rahbek-effect versions. Ask for the actual chucking type, material and electrical requirements in the offered assembly's documentation; do not select a replacement from a material label alone.
What should you match before requesting a replacement ESC?
Send the same information to each supplier:
- Identity: photographs of every identification label, the complete part number, revision and installed tool/chamber identifiers.
- Mechanical fit: request the approved drawing and compare mounting points, connections, wafer-contact geometry and lift-pin arrangement.
- Electrical requirements: ask for documented chucking mode, electrode configuration, connector pinout and operating limits.
- Thermal and gas interfaces: request the specified operating conditions and a drawing identifying the connections fitted to the offered unit.
- Repair history: ask what was repaired or replaced, who performed the work and which test records correspond to this serial number.
For a step-by-step inspection review, use the ESC inspection checklist. Have your process and maintenance teams approve the proposed match before ordering.
What acceptance criteria should you set before buying a used ESC?
Put the acceptance plan in writing before payment. Ask the seller and your qualified service provider to agree on:
- Photographs and traceability records for the exact assembly being sold.
- A documented surface inspection, with the acceptance limits taken from the applicable drawing or service procedure.
- Electrical, leak and thermal checks where required by that procedure, including test conditions, results and equipment used.
- A witnessed functional evaluation under an approved procedure, with explicit pass/fail criteria.
- Packaging requirements, inspection rights and the remedy if the delivered unit fails the agreed checks.
Do not adopt generic voltage, flatness or leakage limits from a buying guide. Ask the responsible engineer to specify them for the actual assembly and application.
Should you refurbish or replace your electrostatic chuck?
Request a repair assessment of the installed unit and a separate replacement offer. Compare the proposed work, inspection evidence, requalification responsibilities and warranty terms. For that decision, read the ESC refurbishment versus replacement guide.
What should you send with a used ESC RFQ?
- Identification-label photographs, complete part number, revision and tool/chamber identifiers.
- Approved drawings covering mounting points, connections and wafer-contact geometry.
- Documented chucking type, dielectric material and electrical requirements.
- Repair history and test records for the offered assembly.
- Acceptance plan, inspection rights and packaging requirements.
How do you request a quote for a replacement ESC?
Use the ceramic electrostatic chuck category as a starting point for your inquiry, not as proof of fit or stock. Include the part number, revision, tool/chamber identifiers, photographs and acceptance plan in your quote request. Request written confirmation of condition, availability, price and delivery terms for the specific offered unit.
Related Parts
Caladan stocks used and refurbished parts referenced in this article — tested, inspected, and ready to ship.