Marking specification of PCB circuit board

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Imagine designing a PCB circuit board that doesn't meet certain specifications. It can disrupt the PCB manufacturing process, affect the product quality and electrical performance of the board, and subsequently impact the stability and service life of the equipment. Today, we'll focus on an important aspect of PCB design: the labeling of PCB circuit boards.

1. Components and soldering surfaces should be labeled with the PCB or PBA number and version number. The board number is marked on the soldering surface, and the assembly solder number is marked on the component side. The assembly solder number is generally the board number incremented by 1.

2. When labeling, the top layer (first layer) should display characters as they appear on the component surface, while the soldering surface should display a mirrored image of the characters. For example, the character 'b' should be displayed as 'b' on the component surface, and as 'd' on the soldering surface.

Marking specification of PCB circuit board

3. If the board requires silk-screening, the characters should have a height of 1.5~2.0mm and a line width of 0.2~0.254.

4. Identification of each layer of the PCB

For multi-layer PCBs, it's important to mark and name the different base layers of the circuit board for production inspection, such as during lamination.

The edge layer identification should include 1.6mm long and 1.0mm wide copper on the edge of the board for each layer. The edge layer marks of each layer should be arranged from top to bottom and left to right.

A. Numbering principle of each layer of the multilayer circuit board:

The top and bottom layers have fixed numbers: the Top Layer is KK, Bottom Layer is KA. The middle layers are numbered from bottom to top: KA, KB, KC, KD ... KK (KI is not used). This numbering scheme can represent up to 10 layers of boards.

B. Numbering principle of multi-layer boards:

The labels of each layer should be placed on the respective layer, expressed by the text of the current layer. The label of the top layer is a positive character when viewed from top to bottom, while the label of the bottom layer is a reverse character when viewed from top to bottom. For other layers, odd numbers are reverse characters, and even numbers are positive characters. No rules, no standards. This is almost a universal truth, and the PCB design industry is no exception.

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