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| Understading the footprint information from datasheet |
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| Sai teja:
Hello, I am trying to draw a footprint of Type A Male USB connector for an application. Details of the part are as follows: Part Number :- 48037-0001 Datasheet :- https://www.molex.com/pdm_docs/sd/480370001_sd.pdf In the datasheet sheet I am unable to find the radius of curvature for mounting pads at the ends. Please help me in this regard. I am attaching the image of the footprint for the reference. Thank you. |
| T3sl4co1l:
Ends are semicircular, so radius equals half the pad width. They don't dimension pads because those are up to the designer, PCB fab, and assembler to determine. Typically an annular ring (pad radius minus hole radius) of 5 mil minimum is required, plus about half the hole radius. So a 20 mil dia. hole gets 5 + (10 / 2) = 10 annulus, or 40 mil dia. pad. Tim |
| Doctorandus_P:
The only reason the holes have a radius is that the're supposed to be made with a mill. perfect rectangular holes would also work, but are dificult (and therefore expensive) to make. Beware of tolerances. you need a bit of room between the holes and the stuff that fits into the holes. Size of pads are indeed not given. For machinal soldering you can get away with thin anular rings around the pads, but for hand soldering it's easier to make the pads a bit bigger, for better heat transfer from you soldering iron to the plated through hole. |
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