What is the difference between PCB single-layer board, double-layer board and multi-layer board
1. Single-Sided Boards
We just mentioned that on the most basic PCB, the parts are concentrated on one side and the wires are concentrated on the other side. Because the wires only appear on one side, we call this kind of PCB a single-sided board.
Because the single-layer board has many strict restrictions on the design circuit (because there is only one side, the wiring cannot cross and must go around a separate path), so only early circuits use this type of board, or some very simple PCBAs will use this board.
2. Double-Sided Boards
This board has wiring on both sides. However, to use two sides of the wire, there must be a proper circuit connection between the two sides. Such "bridges" between circuits are called vias. Vias are small holes on a PCB, filled or painted with metal, that can be connected to wires on both sides. Because the area of a double-layer board is twice as large as that of a single-layer board, and because the wiring can be interleaved (can be wound to the other side), it is more suitable for use on more complex circuits than single-layer boards. Relatively speaking, this is used more.
3. Multi-Layer Boards
In order to increase the area that can be wired, multilayer boards use more single or double-sided wiring boards. Multi-layer boards use several double-layer boards, and put a layer of insulating layer between each layer of boards and then glue them (pressed). The number of layers of the board represents several independent wiring layers, usually the number of layers is even, and includes the outermost two layers. Most motherboards are 4 to 8 layers of structure, but technically it is possible to achieve nearly 100 layers of PCB boards.
Our BQC specializes in the PCBA manufacturing for more than 19 years, we always purchase the corresponding half-layer number of circuit boards according to customer needs.
