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Previously, some electronic devices were usually composed of a single layer of pcb. But more complex electronic devices, such as computer motherboards, consist of Multilayer PCBs. Its have top and bottom layers that look identical to double-sided printed circuit boards. But on both sides of the multilayer board, there are peg layers. Blank pcb is compressed to form a single multilayer printed circuit board. Copper plated holes interconnect all blank PCBs. This manufacturing technique can greatly reduce the size of the multilayer board.

The multilayer printed circuit board is arguably the foundation of all electronic devices. Without it, the device may not work. It is a very important classification in pcb.

Multilayer PCBs feature three or more layers of conductive copper foil buried in several layers. It is laminated and glued between each layer with a thermally protective insulating layer. It finally appears as a double-sided circuit board with several layers. Multilayer boards have various through-holes for all electrical connections. These types of vias include blind and buried vias and plated vias. This is the simple definition of multilayer boards.