![]() As you can see from the formula, this is all dependent on the allowable temperature rise. ![]() The internal trace width is about half of this since it cannot dissipate heat as well. The formula for external trace width is: I = 0.048 * dT^0.44 * A^0.725 as given in the ANSI / IPC-2221/IPC-2221A design standards which I have taken from here. So I hope this helps others or at least helps me next time I need to look it up. There are lots of very advanced calculators online but I had difficulty finding a nice clear chart. So this is a collection of what I’ve found but limited to the ranges that I normally use. ![]() I’ve been looking at the maximum current ratings of both wires and traces and have had a hard time finding good numbers. ![]()
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