What is through hole on PCB?

Through holes on a PCB refer to a hole that is drilled from the top and through to the bottom of a PCB, these can be plated (PTH) or non-plated (NPTH).
A hole of many names-clearance hole, thru-hole, via, plated thru-hole, etc--, a through hole (TH) is a hole in a PCB that is either drilled, reamed, or milled all the way through. Which means if you guessed the hole in the center of the image was the TH, you’re right. The hole on the left is a blind hole and on the right, is an interrupted hole.

NPTH:

    • ≤4.00mm the tolerance on the diameter is +/-0.05mm

    • >4.00mm the tolerance on the diameter is +/-0.10mm

PTH:

    • Average Cu plating thickness is min 20µm.

    • Any individual hole should have a min of 18µm Cu.

    • Any localised part of a hole wall should have 15µm Cu as a min.

    • The tolerance on the diameter please see Tolerances on a PCB.

Blind and buried vias
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