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2025
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03
What are the levels of a PCB printed circuit board, and what are the meanings and functions of each level?
1. Signal layer
The signal layer is mainly used to lay wires on printed circuit boards. Protel99SE provides 32 signal layers, including top, bottom, and 30 intermediate layers.
2. Internal plane layer (internal power/ground layer)
Protel99SE provides 16 internal power/ground layers. This type of layer is only used for multi-layer boards and is mainly used for arranging power and ground wires. We refer to them as double-layer board, four layer board, and six layer board, usually referring to the number of signal layers and internal power/ground layers.
3. Mechanical layer
Protel99SE provides 16 mechanical layers, typically used to set external dimensions, data labels, alignment labels, assembly instructions, and other mechanical information for circuit boards. These information may vary depending on the requirements of the design company or PCB manufacturer. Executing the menu command 'Design | Mechanical Layers' can set more mechanical layers for the printed circuit board. In addition, the mechanical layer can be attached to other layers for output and display together.
4. Solder mask layer
Apply a layer of paint, such as solder mask, to various areas outside the solder pad to prevent tin deposition in these areas. Solder masks are used to match solder pads during the design process and are automatically generated. Protel99SE offers two layers of solder mask, top solder and bottom solder.
5. Paste the mask layer
Its function is similar to that of a solder mask, but the difference is that it corresponds to the solder pad of the surface bonding component in the machine welding process. Protel99SE provides two layers of solder paste protection, top solder paste and bottom solder paste.
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