Designing to Improve: Pth Reliability

摘要

PCB real estate, along with components, vias, and annular ring sizes are shrinking dramatically. Five or 10 years ago, a via hole of 15 to 20 mils with a 5 to 10 mil annular ring was the norm. Now, via sizes ranging from 7 mils down to 4 mils on highly complex boards are increasingly more common. As through-hole size (via) shrinks, so does the annular ring, posing major challenges to fabrication and assembly manufacturers in the process.