Classify vias by physical access in the finished boardThrough vias reach both surfaces, blind vias reach one, and buried vias reach neither. A microvia describes a different construction category and is not a synonym for any one column.Classify vias by physical access in the finished boardTopology does not prescribe drill method, price or reliabilityThroughL1L2L3L4L5L6BlindL1L2L3L4L5L6BuriedL1L2L3L4L5L6Two surfacesOne surfaceNo surface³Ô¹Ïtv · Engineering illustration · Conceptual, not to scale