Inputs

    Amps

    Optional Inputs

    Outputs

    Results for Internal Layers
    Ohms
    Volts
    Watts
    Results for External Layers in Air
    Ohms
    Volts
    Watts

    Formulas Used

    This design tool is based on the charts in IPC-2221.

    First, the Area is calculated:

    • Area[mils^2] = (Current[Amps]/(k*(Temp_Rise[deg.C])^b))^(1/c)

    Then, the Width is calculated:

    • Width[mils] = Area[mils^2]/(Thickness[oz]*1.378[mils/oz])

    For IPC-2221 internal layers: k = 0.024, b = 0.44, c = 0.725

    For IPC-2221 external layers: k = 0.048, b = 0.44, c = 0.725

    Note: k, b, and c are constants resulting from curve fitting to the IPC-2221 curves.

    The IPC-2221(A) equations are different from those in IPC-D-275 in that they are more conservative and derated to compensate for manufacturing effects.

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