Definition

Plated Through Hole (PTH) is a hole drilled through a PCB and plated with copper to create an electrical connection between layers. The hole may be used for through-hole component leads or as a via for routing. PTH diameter typically ranges from 0.2mm to 6mm, with copper plating thickness of 20-25 µm minimum. The annular ring (copper pad around the hole) must be large enough to ensure reliable connection even with drilling tolerance.