Ioan,
My quick method of PTH hole sizing for is nominally .010-.024 larger than nominal lead diameter. You will uncover these numbers in the design specs. I believe the shall nots are NOT LESS THAN .006 over lead diameter and NOT MORE THAN .028 over lead.
The .064 lead requires a large PTH requiring tolerance of +/-.004 or even .005; hence PTH .076 nominal PTH I wouldn't go over .080 nom dia. Check with your assy folks preference.
Brad
Hi,
I have a TH cap that has 0.064" diameter pins and 0.089" diameter holes. Are the holes properly designed?
I have skimmed IPC-2221 and IPC-D-279, but cannot find any formula for calculating the diameter of the hole from the pin diameter. Where can I find such formula?
Thanks,
Ioan
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