In general, there are many places for pcb plants to consider the problem of safe spacing in the design of pcba. There are two categories: one is electrical related safety distance, and the other is non electrical related safety distance.

1. In the production process, the pcb board factory uses smt technology to design the spacing of pcba lines: the distance between conductors shall be at least 4mil. The minimum line spacing, also known as line to line, line to pad distance, from the perspective of yield, the larger the better, and the more common the 10mil.

2. Diameter and width of welding plate: the diameter of mechanical drilling welding plate shall not be less than 0.2mm, and the diameter of laser drilling welding plate shall not be less than 4mil. This is generally based on different pcb boards. The tolerance of holes is slightly different, which can be controlled within 0.05mm generally. The minimum width of pcb welding boards should not be less than 0.2mm.

3. The bonding pad spacing of pcb circuit board should not be less than 0.2mm.

4. If the distance between the copper sheet and the edge of the metal plate is a large area of copper plating, there is usually a dent distance between the copper sheet and the edge of the printed board, which is generally set as 20mil.

SMT chip processing plants usually consider the mechanical aspects of finished pcb circuit boards in PCB design to avoid the possibility of curling or exposed copper sheet edges due to electrical short circuit. SMT technical engineers often reduce the large area covered by copper sheet to 20ml relative to the board edge, rather than a straight board edge covered with copper sheet.

When producing pcba, pcb board manufacturers can use various methods to deal with copper indentation on pcb circuit boards, such as drawing a barrier layer on the edge of pcb board, and then setting the distance between the barrier layer and the barrier layer. Copper. A simple method is introduced here, which is to set different safety distances for copper objects. For example, the safety distance of the whole board is 10ml, the safety distance of copper is 20ml, and 20ml can reduce the impact of the board edge by 20ml, so as to eliminate dead corner copper equipment. Maybe this treatment is helpful to prevent and reduce the waste rate generated in the production process of pcb factory, pay attention to product quality, and provide customers with high-quality products.