The more layers a PCB has, the thicker it will be.

The number of layers and thickness of a PCB are two different concepts, and there is no direct proportional relationship between them. The number of layers refers to the number of "layers" in a circuit board, while the thickness refers to the nominal thickness of the entire circuit board, including the sum of the insulation layer and the copper foil. In the design of multi-layer PCB, the layer thickness refers to the thickness of each layer of copper foil, which is one of the important factors affecting the quality of signal transmission and the difficulty of manufacturing.

Factors affecting the number of layers and thickness

1、The influence of the number of layers

Performance and manufacturing difficulty: The more layers there are, the more reasonable the circuit layout is, and the better the circuit performance is. However, the increase in the number of layers will also bring about problems such as increased structural complexity and increased manufacturing difficulty.

Cost: More layers will increase the difficulty of manufacturing and will also affect the cost.

2、Effect of thickness

Current carrying capacity: The thickness of the PCB board has a certain relationship with its current carrying capacity. Thicker PCB boards may have a greater current carrying capacity, but this will also be affected by factors such as copper foil thickness and trace width.

Reliability: The thickness of the PCB board also affects its practicality and reliability. A PCB board that is too thin may affect the quality and transmission rate of the signal, while a PCB board that is too thick may increase manufacturing costs.

3、Selection of PCB board layers

Reasonable design: When choosing the number of layers of a PCB board, the more layers the better, but it is necessary to make a reasonable choice based on actual needs. In some cases, fewer layers may be more suitable for simple circuit designs or low-cost applications. In applications that require higher performance and complexity, more layers may be necessary.

Therefore, an increase in the number of PCB layers does not necessarily lead to an increase in thickness. The choice of the number of layers depends mainly on factors such as circuit complexity, required functions, manufacturing difficulty and cost. At the same time, the choice of thickness also needs to take into account factors such as current carrying capacity, reliability and manufacturing process. When designing a PCB board, these factors need to be considered comprehensively to achieve the best performance and manufacturing effect.