Contents
What is PCB hole size?
Recommended PCB Hole Sizes
| Lead Size | Hole Size |
|---|---|
| (0.46) .018 Sq. | (0.76) .030 Dia. |
| (0.51) .020 Sq. | (0.81) .032 Dia. |
| (0.64) .025 Sq. | (1.02) .040 Dia. |
| (1.14) .045 Sq. | (1.75) .069 Dia. |
Can you drill a PCB?
Single-sided or double-sided PCB will be drilled directly after getting on the production line. Multi-layer board will be drilled after pressuring layers. By classification of the function, different drilling holes can be divided: parts hole, tool hole, through the hole, blind hole, Buried hole.
What happens if the hole on a PCB is too small?
Holes that are too small for the component lead intended for that via could cause bent leads or the inability to install the component. A part that can’t be installed can ruin an assembly, while bent leads may cause soldering problems and intermittent electrical problems. All of this may result in the PCB having to be refabricated.
Why do printed circuit boards have hole sizes?
This is as true for printed circuit boards as it is for anything else. The hole sizes assigned to a PCB, therefore, will have tolerances attached to them to allow for variations in the lead size of the components to be inserted, as well as for the different conditions the PCB will encounter during manufacturing.
What should the aspect ratio of a PCB hole be?
Normally, when calculating the PCB hole diameter, the aspect ratio between the diameter of the hole and the thickness of the board is considered. If the thickness is 1.60mm, the hole size should be about 0.40. This means that the aspect ratio, in this case, is 1:4.
How big should a drill hole be for a PCB pad?
You will want your pad size to be at least 14 mils over the finished hole size, which will give your pad a 7 mil annular ring. Larger pads and annular rings are better because they help to contain any drill breakout in the hole due to excessive drill wander.