Usually, pcb factories have many places to consider the issue of safety spacing in PCBA design. It is simply divided into two categories: one is the electrical safety distance, and the other is the non-electrical safety distance.

1. In the production process, PCB board manufacturers use SMT technology to design the spacing of PCBA lines: the distance between conductors is at least 4mil. The minimum line spacing, also known as line-to-line, line-to-pad distance, from the perspective of yield, the bigger the better, 10mil is more common.

2. Welding plate aperture and width: The diameter of the mechanically drilled welding plate is not less than 0.2mm, and the diameter of the laser drilled welding plate is not less than 4mil. This is generally based on the difference of the pcb board, the tolerance of the hole is slightly different, generally can be controlled within 0.05mm, the minimum width of the pcb solder plate should not be less than 0.2mm.

3. Pad spacing, the pad spacing of pcb circuit board should not be less than 0.2mm.

4. If the distance between the copper skin and the edge of the metal plate is a large area of copper plating, there is usually a dent distance from the edge of the printed board, and it is generally set to 20mil.

The smt chip processing factory usually considers the mechanical aspects of the finished pcb circuit board when designing the PCB, to avoid the possibility of curling or exposed copper skin edges due to electrical short circuits, and smt technical engineers often reduce the copper board to cover a large area relative to the board edge 20ml, instead of the edge of the board covered with copper.

PCB board manufacturers can use various methods to deal with the copper indentation on the PCB circuit board when producing PCBA, such as: draw a barrier layer on the edge of the printed board, and then set the distance between the barrier layer and the barrier layer. copper. Here is a simple method, which is to set different safety distances for copper-clad objects, such as 10ml for the entire board, 20ml for copper, and 20ml for 20ml to reduce the impact on the edge of the board, so as to eliminate dead copper equipment. Perhaps such a treatment method is beneficial to prevent and reduce the waste rate generated in the production process of the pcb factory, pay attention to product quality, and provide customers with high-quality products.