How to Calculate the Current Carrying Capacity in PCB technology

 

The calculation of PCB current carrying capacity has always lacked authoritative technical methods and formulas. Experienced Layout engineers can make more accurate judgments based on personal experience. But for Layout novices, it can really be a problem.


The retention capacity of PCB depends on the following factors: line width, line thickness (copper foil thickness), and allowable temperature rise. Everyone knows that the wider the PCB trace, the greater the retention capacity.


But many people have a misunderstanding such as: assuming that under the same conditions, a 10mil trace can withstand 1A, how much current can a 50mil trace withstand? Many people think it is 5A. But in fact, the current-carrying capacity cannot be calculated by the line width multiple in this way. Please see the following data from international authoritative institutions for your reference:


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