PCB multi-layer circuit board is actually made by laminating and bonding several etched single or double-sided boards. So, what are the advantages of PCB multi-layer circuit board compared to single and double-layer circuit board.

1. Multilayer circuit boards have high assembly density and small volume; With the decreasing size of electronic products, there will be higher requirements for the accuracy and functionality of circuit boards, and the demand for multi-layer circuit boards will also be increasing. 2. Multilayer circuit boards have the advantages of convenient wiring, significantly reducing the length of wiring and shortening the connections between components, thereby improving the speed of signal transmission and effectively increasing the sales of circuit boards. 3. For high-frequency circuits, after adding a ground layer, the signal line will form a constant low impedance to the ground layer, significantly reducing the circuit impedance and achieving good shielding effect. 4. For electronic products with high heat dissipation requirements, multi-layer circuit boards can be equipped with metal core heat dissipation layers to meet special functional needs such as shielding and heat dissipation. Generally, high-end electronic products are widely used, especially for multifunctional electronic devices with increasing demand. In terms of performance, multi-layer circuit boards are superior to single and double-sided boards, but the higher the number of layers, the higher the production cost, the longer the processing time, and the more complex the quality inspection. The most common type of multi-layer circuit board is the four six layer board. The difference between the four layer board and the six layer board is that there are two additional internal signal layers between the middle layer, ground layer, and power layer. The six layer board is thicker than the four layer board. Single and double-layer boards are easy to distinguish. When holding the board and looking at the light, except for the wiring on both sides, the rest of the area is transparent. But for the four layer board and six layer board, if there are no corresponding markings on the board, it is not easy to make a simple distinction. Overall, multi-layer circuit boards have been widely used in the production and manufacturing of electronic products due to their design flexibility, economic superiority, and stable and reliable electrical performance.