Printed circuit assemblies
Calculating machines and pocket-size data recording, reproducing and displaying machines with calculating functions; accounting machines, postage-franking machines, ticket-issuing machines and similar machines, incorporating a calculating device; cash registers. > Parts and accessories of the machines of heading 84.71 > Printed circuit assemblies > Printed circuit assemblies
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Subheadings
Products classified under Tariff item 8473.30.20
Crystal Grinder Diameter Control PCA
A printed circuit assembly used in automated crystal grinders that shape semiconductor boules to precise wafer diameters. It processes laser measurement feedback for closed-loop diameter control. This PCA is a part of machinery used in the manufacture of semiconductor devices, falling under heading 84.71 as a component of automatic data processing machines.
Float Zone Crystal Grower Power Supply PCA
A printed circuit assembly providing high-frequency RF power control for float zone crystal growers that produce ultra-pure silicon ingots for semiconductor wafers. It regulates zone melting parameters critical for defect-free crystal growth. This PCA is a part of machinery used in semiconductor manufacturing, classifiable under heading 84.71.
Semiconductor Fab Vacuum Pump Controller Board
A PCA for controlling turbomolecular vacuum pumps in semiconductor wafer processing equipment. It manages pump speed, pressure setpoints, and vibration isolation. This printed circuit assembly is a part of machines classified under heading 84.71, specifically for semiconductor manufacturing.
Semiconductor Wafer Crystal Puller Control Board
This printed circuit assembly serves as the main control board for Czochralski crystal pullers used in producing monocrystalline silicon boules for semiconductor wafers. It manages temperature, rotation, and pulling speed. As a part of semiconductor manufacturing equipment, it falls under heading 84.71.
Wafer Handling Robot Motion Controller PCA
A printed circuit assembly for cluster tool wafer handling robots that transfer wafers between semiconductor processing chambers. It provides real-time trajectory control with sub-micron repeatability. This PCA is a part of automatic data processing machines used in semiconductor manufacturing.
Wafer Lapping Machine Pressure Control Board
This PCA regulates pneumatic pressure systems in wafer lappers that achieve flatness tolerances for semiconductor wafer fabrication. It maintains nanometer-level uniformity across wafer surfaces. As a part of semiconductor manufacturing equipment, it falls under heading 84.71.
Wafer Polisher Rotation Controller PCA
A printed circuit assembly controlling multi-platen rotation speeds in chemical mechanical planarization (CMP) wafer polishers for semiconductor devices. It ensures uniform material removal rates across wafer surfaces. This PCA is a part of semiconductor manufacturing equipment under heading 84.71.
Wafer Slicing Saw Servo Drive Printed Circuit Board
This PCA controls precision servo motors in wafer slicing saws that cut monocrystalline boules into thin semiconductor wafers. It ensures micron-level accuracy in blade positioning and feed rates. As a part of semiconductor manufacturing equipment, it falls under heading 84.71.