The Printed Circuit Board (PCB) manufacturing process is a complex and precise undertaking involving multiple steps and techniques. For core information regarding this product, please leave your contact details, and we will get back to you as soon as possible.
The detailed manufacturing process is outlined below:
Circuit Diagram Design: The first step involves designing the circuit schematic and using professional software (such as Altium Designer, Cadence, etc.) to convert it into a PCB layout. This stage requires careful consideration of circuit performance, component placement, and routing optimization.
Substrate Preparation: Select an appropriate substrate material (such as FR4, Rogers, PTFE, or ceramic) and cut it to the required dimensions based on the design specifications. The surface of the substrate must be thoroughly cleaned to ensure it is free of dust or grease.
Pattern Transfer: Transfer the designed circuit pattern onto the substrate using photolithography or screen printing techniques. Photolithography utilizes a photosensitive film and UV exposure, whereas screen printing involves the direct application of ink.
Etching: The unprotected copper foil is removed using a chemical etchant (such as ferric chloride or ammonia solution), leaving behind the desired circuit pattern. Etching time and temperature must be strictly controlled to prevent over-etching or under-etching.
Drilling: A CNC drilling machine is used to drill component mounting holes and vias into the board. Hole diameters typically range from 0.1 mm to 6 mm and are selected based on component pin dimensions and circuit requirements.
Solder Mask Printing: A solder mask layer (typically green or black) is printed onto the surface of the circuit board to protect the circuitry from oxidation and short circuits. The solder mask requires curing via ultraviolet (UV) light.
Legend Printing: Component identifiers and symbols (in white or black) are printed on the board to facilitate assembly and maintenance.
Surface Finish: A surface finish process-such as HASL (Hot Air Solder Leveling), ENIG (Electroless Nickel Immersion Gold), or OSP (Organic Solderability Preservative)-is selected based on requirements to enhance solderability and corrosion resistance.
Testing and Inspection: Circuit connectivity and the absence of short circuits are verified through flying probe testing or AOI (Automated Optical Inspection). High-frequency boards also undergo impedance testing and signal integrity analysis.
Depaneling and Packaging: The large panel is cut into individual PCBs, which are then placed in anti-static packaging to prevent damage during transit.
Hole Metallization: A layer of copper is deposited onto the inner walls of the holes-either through chemical plating or electroplating processes-to establish electrical connections between layers. The copper plating thickness is typically 20 to 30 microns.
