According to the number of PCB layers, it is generally divided into Single-sided Board (SSB), Double-sided Board (DSB), and Multilayer Board (MLB).
a) Single-sided PCB
A Single-sided PCB concentrates all the components on one side of the PCB board, so it is called a single-sided board. Because the single-sided PCB has a limited area, the circuit design will be relatively simple and only suitable for electronic products with simple functions.
b) Double-sided PCB
Double-sided means that there are components and circuits on both sides of the PCB board. Under the same size, it will double the designable area of the single panel, which can effectively solve the electromagnetic interference caused by the interlaced wires in the single panel. It can also reduce product volume and can be used in products with more complex circuit designs.
Double-Sided Double Layer PCB Board
c) Multi-layer PCB
The multi-layer PCB is composed of single-sided and double-sided boards. The most common one is to use two double-layer boards as the inner board and then use two single-layer boards on the outside, combined into four pieces by a positioning system and insulating bonding materials. For multi-layer boards, of course, the number of layers can be increased according to the product’s design, and they are generally even-numbered. The design of the multi-layer board increases the area and density of the wiring and can make more complex circuit designs. The components of the multi-layer board are mostly SMD components, and the component layout is more precise so that the product can be lighter and small.
Multilayer Circuit Board