PCB printed circuit board is divided by layers. What series are there? According to the number of circuit layers, it can be divided into single panel, double panel and multilayer board. The common multilayer board is generally 4 or 6 layers, and the complex multilayer board can reach dozens of layers. There are three main types of PCB:

Single-sided boards are on the most basic PCB. The parts are concentrated on one side, and the wires are concentrated on the other side (when there are patch components, the wires are on the same side, and the plug-in devices are on the other side). Because wires only appear on one side, this kind of PCB is called single-sided. Because the single panel has many strict restrictions on the design of the circuit (because there is only one side, the wiring cannot cross and must be around a separate path), only the early circuits used this type of board.

Double-sided boards have wiring on both sides of the circuit board, but to use wires on both sides, it is necessary to have proper circuit connections between the two sides. The "bridge" between such circuits is called a guide hole (via). The pilot hole is a small hole filled or coated with metal on the PCB, which can be connected with the wires on both sides. Because the area of the double-sided panel is twice as large as that of the single panel, the double-sided panel solves the difficulty of staggered wiring in the single panel (it can be connected to the other side through holes), and it is more suitable for more complex circuits than the single panel.

Multi-Layer Boards In order to increase the area that can be wired, more single-sided or double-sided wiring boards are used for multi-layer boards. A printed circuit board with one double-sided as the inner layer, two single-sided as the outer layer, or two double-sided as the inner layer, and two single-sided as the outer layer, and the printed circuit board with alternating conductive patterns interconnected according to the design requirements through the positioning system and insulating bonding materials, becomes a four-layer and six-layer printed circuit board, also known as a multi-layer printed circuit board. The number of layers of the board does not mean that there are several independent wiring layers. In special cases, empty layers will be added to control the thickness of the board. Usually, the number of layers is even and includes the two outermost layers. Most mainboards are 4 to 8 layers in structure, but in theory, nearly 100 layers of PCB can be achieved. Large-scale supercomputers mostly use multi-tier mainboards, but because such computers can be replaced by clusters of many ordinary computers, ultra-multi-tier boards are gradually not used. Because the layers in the PCB are closely combined, it is not easy to see the actual number, but if you carefully observe the motherboard, you can still see it.

Jiangmen Xinji Circuit Co., Ltd. is a high-tech enterprise specializing in the production of high-precision double-sided and multi-layer circuit boards.