In the process of circuit board planning, there are some commonly used parameters to pay attention to, such as the size of conductive holes, the distance between lines, the diameter of plug-in holes, and so on. What are the specific ones? Let's take a closer look with the Shengkong editor:

1、 Via via (commonly known as conductive hole)

1. Small aperture: 0.3mm (12mil)

2. The diameter of the small via (VIA) should not be less than 0.3mm (12mil), and the single-sided size of the solder pad should not be less than 6mil (0.153mm). If it is larger than 8mil (0.2mm), this point is not limited. It is very important to consider this in the planning

3. VIA hole to hole distance (hole edge to hole edge) must not be less than 6mil and greater than 8mil. This point is very important and should be considered in planning

4. The distance from the solder pad to the shape line is 0.508mm (20mil)

2、 Route

1. Small line spacing: 6mil (0.153mm). Small line spacing refers to the distance between lines and pads, which should not be less than 6mil. From a production perspective, the larger the distance, the better. Generally, it is recommended to have a distance of 10mil. However, if planning conditions permit, the larger the distance, the better. This is very important and should be considered in planning

2. Small line width: 6mil (0.153mm). That is to say, if the line width is less than 6mil, it cannot be produced (the inner layer line width and line spacing of PCB multi-layer boards are 8MIL). If the planning conditions permit, the larger the planning, the better. The line width should be larger, and our Yaxinda PCB factory should produce better with a higher yield rate. Generally, the planning convention is around 10mil, which is very important and should be considered in the planning

3. The distance from the line to the shape line is 0.508mm (20mil)

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

1. The outer ring of the plug-in hole (PTH) solder pad cannot be less than 0.2mm (8mil) on one side, of course, the larger the better. This is very important and should be considered in the planning

2. The distance between the plug-in hole (PTH) hole and the hole (hole edge to hole edge) cannot be less than 0.3mm. Of course, the larger the better. This is very important and should be considered in planning

3. The size of the plug-in hole depends on your component, but it should be larger than your component pin. It is recommended to have a pin size larger than at least 0.2mm, which means 0.6. You should plan it to be at least 0.8 to prevent processing tolerances from making it difficult to insert,

4. The distance from the solder pad to the shape line is 0.508mm (20mil)

4、 Anti welding

1. Plug in hole opening, SMD opening must not be less than 0.1mm (4mil) on one side

5、 Characters (the planning of characters directly affects production, and the clarity of characters is often related to the length of character planning)

1. The character width cannot be less than 0.153mm (6mil), the character height cannot be less than 0.811mm (32mil), and the ratio of width to height is 5. That is to say, a character width of 0.2mm and a character height of 1mm are derived from this

6： The small distance between non-metallic slot holes should not be less than 1.6mm, otherwise it will greatly increase the difficulty of milling edges

7： Imposition

1. Whether there are gaps in the layout, and whether there are gaps in the layout. The gap in the layout with gaps should not be less than 1.6 mm (for a thickness of 1.6 mm), otherwise it will greatly increase the difficulty of milling edges. The size of the layout work board varies depending on the equipment. The gap in the layout without gaps is about 0.5mm, and the process edge should not be less than 5mm

Article source: PCB manufacturerhttp://www.yonghongpcb.com/