Optional Inputs



    Internal Layers
    Ω Ohms
    External Layers in Air
    Ω Ohms
    Required Track Clearance

    Formulas Used

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

    First, the Area is calculated:

    • Area[mils²] = ( Current[Amps] / (k*( Temp_Rise[°C] )^b) )^(1/c)

    Then, the Width is calculated:

    • Width[mils] = Area[mils²] / ( 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.

    Disclaimer: Qorvo makes no representations or warranties of any kind, express or implied, about the completeness, accuracy, or reliability of the tools on this web page. In no event will Qorvo be liable to any user of these tools for any loss or damages, including without limitation, indirect or consequential damages arising out of or associated with the use of these tools.