PCB走線寬度與通過電流的關系

This Javascript web calculator calculates the trace width for printed circuit boards based on a curve fit to IPC-2221 (formerly IPC-D-275). Also see the via calculator.

New features:

Results update as you type
Several choices of units
Units and other settings are saved between sessions
Blog format allows user comments

Notes:

The trace width is calculated as follows:

First, the Area is calculated:

Area = (Current/(k*(Temp_Rise)^b))^(1/c)

Then, the Width is calculated:

Width = Area/(Thickness*1.378)

For IPC-2221 internal layers: k = 0.0150, b = 0.5453, c = 0.7349

For IPC-2221 external layers: k = 0.0647, b = 0.4281, c = 0.6732

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

For frequently asked questions, see the comments.