PCB News - Do you know which four-layer PCB is?

Do you know which four-layer PCB is?

Multi-layer PCB is the product of the development of electronic information technology in the direction of high speed, multi-function, large capacity, small volume, thinness and light weight. For the production of PCB boards, the more layers there are, the more procedures will be produced, and the failure rate will increase, and the corresponding cost will be higher. Therefore, multi-layer boards are generally used in advanced circuits. Take a four-layer board, do you know which four-layer PCB is?

The four layers of the four-layer PCB board are divided into: signal layer (top layer), signal layer (bottom layer), power layer (middle layer) and ground layer (middle layer).

Usually in the circuit board, components are usually placed on the top layer, so the top layer is also called the component surface; the bottom layer is generally used for soldering, so the bottom layer is also called the soldering surface. But for SMD components, components can be placed on the top and bottom layers.

The layout of each layer of the four-layer PCB board:

1. There are multiple GNDs on the first layer in the middle, you can take a small number of lines, but don't split each copper; the second layer of VCC copper in the middle has multiple power sources, you can take a small amount of lines, but don’t split Every shop.

2. There are four wiring layers, generally the top layer of TOP LAYER, the bottom layer of Buttom Layer, VCC and GND. Generally, through holes, buried holes, and blind holes are used to connect layers with each other, and there are more buried holes and blind holes than double-layer PCBs. In addition, try not to run signal lines on the two layers of VCC and GND.

The above is the relevant knowledge of "Which four layers of a four-layer PCB board", I hope it will be helpful to you.

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