In general how do you decide what trace width to use?
I prepared a PCB layout with the trace width mainly 0.4064 mm and couple of them are 0.3048 mm. power ratings are 5V , 12V at max 0.4A. What would be the smallest trace width that would be fine with that ratings?
I am going to have a trace for a power unit. I will connect the outlet supply (220-240V), what trace width would you recommend for it?
Answer
There are IPC standard calculations for trace widths based upon current draw. (IPC-2221)
These take into account freq, temperature rise, what layers of the board the traces are and many other factors.
There are many web calculators out there - http://circuitcalculator.com/wordpress/?p=25/
My absolute favorite tool for calculating many of the variables in pcb design is a free tool from Saturn PCB. It is free and I am not associated with them in any way.
This tool is great and will answer all your questions from above.
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