pcb
Home > Blog

What is the “aspect ratio”?

The relationship between the diameter of the hole and its length. When a manufacturer states that their production has an “aspect ratio” of 8:1 it means, for example, that the hole’s diameter is 0.20 mm in a 1.60 mm thick PCB.
For HDI structures, a suitable aspect ratio for micro via is normally 0.8:1, with 1:1 preferable for ease of plating.

You may also like