How to Set the Width and Moment of Sample Lines in a PCB Factory

How to Set the Width and Moment of Sample Lines in a PCB Factory

What is PCB line width and line moment? The PCB line width and line moment referred to in the sample circuit board refer to: the layout of each line on the PCB optical board, find the smallest line, and use the Gerber data viewing software to measure the width of the current line from left to right, which is called "line width". The width between other lines is called "line width", as shown in the following figure: The wider the line width and line moment, the easier the process ability is, and the more precise the process difficulty is, Under normal circumstances, the line width and line spacing are controlled at 6/6mil, and PCB vias are selected at 12mil. More than 80% of PCB factories can produce them, and the production cost is the most affordable. The minimum line width and line spacing are controlled at 4/4mil, and the vias are selected at 8mil (0.2mm). More than 70% of PCB factories can also meet the requirements, and the process cost is relatively high. The minimum PCB line width and line spacing are controlled at 3.5/3.5mil, and the vias are selected at 8mil (0.2mm), Some circuit board factories are not satisfied with production, and the price will be more expensive. The minimum line width and line spacing should be controlled to 2/2mil, and the through hole should be selected to be 4mil (0.1mm, which is usually HDI blind buried hole design and requires laser through hole drilling). This belongs to high-precision circuit boards, and most circuit board factories cannot produce them anymore, and the price is also more expensive. When describing the line width and line spacing setting rules here, they refer to line to hole, line to line, line to pad, and line t through hole The size between elements such as holes and disks. Secondly, the density of PCB design should be set. If the density is small, the looser the board layout, the larger the line width and distance can be set. Conversely, the more precise the board, the smaller the line moment. Generally, the following steps can be used: 1:8/8mil, and 12mil (0.3mm) for via selection. 2: 6/6mil, select 12mil (0.3mm) for through-hole. 3: 4/4mil, select 8mil (0.2mm) for via. 4: 3.5/3.5mil, select 8mil (0.2mm) for through-hole. 5: 3.5/3.5mil, via hole selection 4mil (0.1mm, laser drilling). 6: 2/2mil, via hole selection 4mil (0.1mm, laser drilling).