When setting up for a new PCB, I will decide on the range of PCB fabs I want to use, as well as an estimation of PCB fabrication budget. I tend to design for “6 mil rules”, as I turn quick little designs through PCB fabricators using online ordering procedures. PCB Design Rules Should Match Fab Capabilities For example, entirely different sets of design rules may exist in regions such as the area under an Integrated Circuit (IC) with a Ball Grid Array (BGA) footprint.Īs density increases and/or as signal edge rate increases, it is not uncommon for these rules to be listed in other units and levels of complexity. Starting a new design means selecting the PCB design rules that matter for your circuit boards. This set of rules is supported by PCB fabrication companies and they help engineers design a functional circuit board. Exceptions to the default 10 mil rules exist, especially as density and complexity increase. The exceptions are the silk to solder mask clearance and the solder mask expansion clearance around pads, both of which default to 4 mils. This includes track to track, pads to tracks, through-holes to other pads or vias, and pretty much anything else you can imagine. What's more, most of the other spacings also default to 10 mils. I was impressed that, right out of the box, the stock design rule checks (DRCs) in my copy of Altium 20 pretty much covered all the bases on how to make a “standard” printed circuit board (PCB). Altium Designer defaults to “10 mil” rules, which means that the standard spacing and widths of copper tracks is 10 mils.
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