Copper Weight
In plain English
How thick the copper wiring is, oddly measured by weight. Thicker copper carries more electricity — like a wider water pipe handles more flow.
The technical version
The thickness of a copper layer, expressed in ounces per square foot.
Copper weight expresses the thickness of a copper foil in ounces per square foot; 1 oz is about 35 microns. Heavier copper carries more current but etches with greater undercut, requiring wider trace spacing. It directly affects DFM minimums, controlled impedance, and current-carrying capacity.
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