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PCB trace
From HwB
According to recommendations in IPC-2221 (formerly IPC-D-275, MIL-STD-275) on how to calculate
minimum PCB (printer circuit board) trace width.
Below table is valid for:
„ PCB material FR-4
„ Board thickness=1.6mm (0.063")
„ Trace thickness=35µm (1 oz)
„ Allowed temperature rise=10 °C
Contents
„ 1 Table
„ 2 Graph
„ 2.1 Outer traces (0-1 A)
„ 2.2 Outer traces (1-10 A)
„ 2.3 Inner traces (0-1 A)
„ 2.4 Inner traces (1-10 A)
„ 3 Formula
„ 4 Links
Table
Current Width (inner) Width (outer)
A mils mils
0.01 0.308 0.118
0.05 1.54 0.591
0.1 3.08 1.18
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Last modified: September 9, 2013