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The IPC-2221 data from which these formulas are derived only covers up to 35 Amps, trace width up to 400 mils, allowable temperature rise from 10 to 100 degrees Celsius, and copper of 0.5 to 3 ounces per square foot. Q: Is there a limit to the amount of current this tool can calculate a width for?Ī: Yes. These calculations are industry standard and believed to be correct, but not guaranteed. Width = Area/(Thickness*1.378)Īs per IPC-2221 for internal layers k = 0.024 and for external layers: k = 0.048 Then, the Width is calculated from the cross sectional area for a chosen thickness: The trace width can then be calculated by re-arranging this formula to determine the cross-sectional area that our desired current can safely pass through.Īrea = (Current/(k*(Temp_Rise)^ 0.44))^(1/0.725) Where I is maximum current in Amps, k is a constant, dT is temperature rise above ambient in ☌, & A is cross sectional area of trace mils². The formula for calculating allowable current through a trace is published in the IPC-2221 standard section 6.2 as shown below. Table of Bittele production minimum sizes
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