In this year's technology industry, countless new products have been officially announced or will be officially announced, which is dazzling! For example, the iphone13, which will be officially announced in a month, everyone wants to try the functions officially announced by Apple. Buy or buy? Don’t worry, what I want to show you today is not the complete essence of technology, but the core part of these technology bodies, the PCB circuit board. We have learned a lot about the classification of PCB before. Today, PCB circuit board manufacturers will continue to take you to expand the unknown field. How many layers does a PCB circuit board have?

PCB circuit board

Generally speaking, there is no certain standard for the number of layers of PCB circuit boards, which will be determined according to your needs for PCB functions. PCB circuit board manufacturers will start with some conventional PCB layer numbers. Conventional PCB boards are divided into six layers, namely mechanical layer, forbidden wiring layer, solder mask layer, solder flux layer, silk screen layer and via layer.

The "green" layer on the PCB board is what we call the solder mask, but don't think it's green because it's painted with green paint, it's actually tin plating, but this color is not chosen for good looks Yes.

There are pads for SMD components, the size is the same as the top/bottom layer, and it is used to open the stencil to leak tin.

The silk screen layer can also be subdivided into a top silk screen layer and a bottom silk screen layer.

The flux layer is used when the machine is patched, and it corresponds to the