Meaning of PCB layers

- Jan 08, 2020-

Meaning of PCB layers 

Abstract: signal layer is mainly used to lay wires on circuit board. Protel 99 SE provides 32 signal layers, including top layer, bottom layer and 30 midlayer

1 signal layer

The signal layer is mainly used to lay the wires on the circuit board. Protel 99 SE provides 32 signal layers, including top layer, bottom layer and 30 midlayer

 

2 internal plane layer

Protel 99 SE provides 16 internal power / ground layers. This type of layer is only used for multi-layer boards, mainly for arranging power lines and ground wires. We call it double-layer board, four layer board and six layer board, which generally refers to the number of signal layer and internal power / ground layers


3 mechanical layer

Protel 99 SE provides 16 mechanical layers, which are generally used to set the overall dimensions, data marks, alignment marks, assembly instructions and other mechanical information of the circuit board. These information vary according to the requirements of the design company or PCB manufacturer. Executing the menu command design| mechanical layer can set more mechanical layers for the circuit board. In addition, the mechanical layers can be attached to other layers together Output display

  

4 solder mask layer

Apply a layer of coating, such as anti soldering paint, to all parts outside the pad to prevent tin on these parts. The solder mask is used to match the pad during the design process, and it is generated automatically. Protel 99 SE provides two solder mask layers, top solder and bottom solder

 

5 paste mask layer

It is similar to the function of the solder mask layer, but different from the pad of the corresponding surface bonding element when the machine is welded. Protel 99 SE provides two solder paste protective layers: Top paste (top layer) and bottom paste (bottom layer)

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