What is the maximum number of layers that a PCB can have?

Multilayer PCBs are designed with multiple conductive layers to achieve high-speed signal transmission and efficient processing, with factors affecting the number of layers including the purpose of the circuit board, signal type, through-hole selection, and signal layer and pin density. The main reasons for multilayer PCB design include improving signal integrity, space utilization, power layering, and thermal management, with advantages including reduced circuit impedance, improved energy transmission efficiency, and reduced equipment weight.

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