Why Design PCB Holes as ‘Annular Ring-Free’?
★ What is an “Annular Ring”? First, to understand “annular ring-free”, we need to know what an “annular ring” is. In traditional PTH (Plated Through Hole) design, a hole consists of three parts: ✒︎ Drill Hole: The hole drilled in the PCB. ✒︎ Copper Layer on Hole Wall: The copper layer formed on the hole … Read more