Definition

A trace is a copper conductor path etched on a PCB layer that connects component pads, vias, or other traces. Trace width determines current-carrying capacity (wider = more current) and affects impedance (wider = lower impedance for same dielectric height). Minimum trace width depends on copper weight and manufacturing capability (typically 75-100 µm for standard, 50 µm for advanced). Trace spacing affects crosstalk and voltage withstand. High-speed traces require controlled impedance and length matching.