PCB has the following functions in electronic devices.

(1) It provides mechanical supports for the fixation and assembly of various electronic components such as integrated circuits, realizes the wiring and electrical connection or electrical insulation between various electronic components such as integrated circuits, and provides the required electrical characteristics.

(2) Provide solder mask graphics for automatic soldering and identification characters and graphics for component insertion, inspection and maintenance.

(3) After electronic devices adopt printed circuit boards, due to the consistency of the same type of printed circuit boards, errors in manual wiring are avoided. It can also achieve automatic insertion or surface mounting of electronic components, automatic soldering, and automatic detection, ensuring the quality of electronic products, improving labor productivity, reducing costs, and facilitating maintenance.

(4) Provide the required electrical characteristics, characteristic impedance and electromagnetic compatibility characteristics for the circuit in high-speed or high-frequency circuits.

(5) Printed circuit boards with embedded passive components provide certain electrical functions, simplify the electronic installation process, and enhance the reliability of the product.

(6) In large-scale and very large-scale electronic packaging components, it provides an effective chip carrier for the miniaturization of electronic components in chip packaging.