Electronic – Standard PCB trace widths

layoutpcb

Is there a standard for the sizes of PCB traces?

That is are some 25 mil and others 10 mil or is can you choose your own?

I plan to run 400mA through some thicker traces, but less than 30mA for all other traces. About what size would I need?

Best Answer

Your traces can be any size you want as long as you stay within the minimum feature size and spacing that your PCB fab supports for your particular price point.

These will cover basic needs, the trace width one is a best fit calculation to the chart Engen posted:

PCB Trace Width Calculator

PCB Via Calculator

Neither of those cover controlled impedance calculations, if you need those look elsewhere.