Multilayer circuit boards contain many types of working layers, such as: protective layer, silk screen layer, signal layer, internal layer, etc. How much do you know about these layers? The functions of each layer are different, let us Let’s take a look at what the functions of each level have to do!
Protective layer: used to ensure that the places on the circuit board that do not need tin plating are not tinned, and the PCB circuit board is made to ensure the reliability of the circuit board operation. Among them, Top Paste and Bottom Paste are the top solder mask layer and the bottom solder mask layer, respectively. Top Solder and Bottom Solder are the solder paste protection layer and the bottom solder paste protection layer, respectively.
A detailed introduction to the multi-layer PCB circuit board and the meaning of each layer
Silk screen layer – used to print the serial number, production number, company name, logo pattern, etc. of the components on the circuit board.
Signal layer – used to place components or wiring. Protel DXP usually contains 30 middle layers, namely Mid Layer1~Mid Layer30, the middle layer is used to arrange signal lines, and the top and bottom layers are used to place components or copper.
Internal layer – used as a signal routing layer, Protel DXP contains 16 internal layers.
All PCB materials of professional PCB manufacturers must be carefully reviewed and approved by the engineering department before cutting and production. The pass-through rate of each board is as high as 98.6%, and all products have passed the RROHS environmental certification and the United States UL and other related certifications.