What are the technological requirements for PCB production?

What are the technological requirements for PCB production?

When taking orders, processing engineering materials and production processes, we often find that some customers' designs do not meet the feasibility requirements of PCB production processes. Of course, this is not to say that the level of designers is limited, but because most design engineers have not been to the PCB factory to understand how a qualified PCB board is produced, and they know too little about PCB production, which leads to the design. There is no way to process and produce the board, or the main reason for problems in the production process, so I hope the following content can provide help for engineers engaged in PCB design.

Detailed explanation of related design parameters:

1. Line

1. Minimum line width: 6mil (0.153mm). That is to say, if the line width is less than 6mil, it will not be able to produce, (the minimum line width and line spacing of the inner layer of the multilayer board is 8MIL) if the design conditions permit, the larger the design, the better the line width, the better the factory, the higher the yield , The general design convention is about 10mil, this point is very important, the design must be considered.

2. Minimum line distance: 6mil (0.153mm). The minimum line distance is line-to-line, and the distance from line to pad is not less than 6mil. From a production point of view, the larger the better. Generally, it is 10mil. Of course, if the design is conditional, the larger the better. This is very important. Design Must be considered.

3. The distance between the line and the outline line is 0.508mm (20mil)

Second, via vias (commonly known as conductive holes)

1. Minimum aperture: 0.3mm (12mil)

2. The minimum via hole (VIA) aperture is not less than 0.3mm (12mil), and the single side of the pad cannot be less than 6mil (0.153mm), preferably greater than 8mil (0.2mm), but not limited. This point is very important, and the design must be consider.

3. The via hole (VIA) hole-to-hole spacing (hole edge to hole edge) cannot be less than 6mil, preferably greater than 8mil. This point is very important, and the design must be considered.

4. The distance between the pad and the outline line is 0.508mm (20mil)

3. PAD pad (commonly known as plug-in hole (PTH))

1. The size of the plug-in hole depends on your component, but it must be larger than your component pin. It is recommended to be larger than at least 0.2mm or above, which means that the component pin of 0.6, you must design at least 0.8 to prevent processing Tolerance makes it difficult to insert.

2. Plug-in hole (PTH) The outer ring of the pad should not be less than 0.2mm (8mil) on one side. Of course, the larger the better, this is very important, and the design must be considered

3. Plug-in hole (PTH) hole-to-hole spacing (hole edge to hole edge) cannot be less than: 0.3mm, of course, the larger the better, this point is very important, and the design must be considered

4. The distance between the pad and the outline line is 0.508mm (20mil)

Four, solder mask

The plug-in hole opens the window, and the single side of the SMD window cannot be less than 0.1mm (4mil)

5. Characters (the design of the characters directly affects the production, the clarity of the characters is very relevant to the character design)

The character width should not be less than 0.153mm (6mil), the character height should not be less than 0.811mm (32mil), and the ratio of width to height should preferably be 5. That is, the character width is 0.2mm and the character height is 1mm, and so on.

Six: Non-metalized slot holes The minimum spacing of the slots is not less than 1.6mm, otherwise it will greatly increase the difficulty of milling

Seven: Imposition

1. The imposition is divided into no-gap imposition and gap imposition. The imposition gap with gap imposition should not be less than 1.6 (plate thickness 1.6) mm, otherwise it will greatly increase the difficulty of milling. The size of the imposition work board varies depending on the equipment. The gap of the gap imposition is about 0.5mm and the process edge is generally 5mm

2. The dimension of the imposition V-cut direction must be greater than 8cm, because the V-cut smaller than 8cm will fall into the machine when the V-cut is cut. The V-cut width must be less than 32cm. If the width is greater than this width, it will not fit into the V-cut machine. The production process is limited, not that we cannot do it.

3. V-cutting can only go in a straight line. Due to the shape of the board, it is impossible to go in a straight line. Spaces can be added for the stamp hole bridge connection and related precautions