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How to Calculate OAR in pcb layout

dkshah86

 

hi everyone.

i am new in PCB Design..

i am using Orcad 10.

I have made one design and when i make order for manufacturing they have some queries like.
         " Minimum OAR (Outer Annular Ring) in our  service is 0.125mm.Your design has OAR of 0.0mm for drill size of 0.30mm end size."         


i don't know how to correct it..

In my design drill size of the pad is 1.0mm and at TOP and BOTTOM it is 1.20mm as well as in PLANE its size is 1.40mm.
but i think this one is incorrect..

So if any one knows how to calculate it please let me know.

Thanks
  • oldmouldy

    The message looks to be refering to a finished drill size of 0.3mm, this would have a pad less than or equal to 0.3mm, probably not a good place to be. (Could be a via definition, rather than a through pin definition?)

    Also a 1.2mm pad and a 1mm drill is probably not too good either, I think that your service would be looking for, at least, a 1.25mm pad for a 1mm drill and, even then, using the minimum is probably not a good place to be unless this is really essential to making the design work, bigger than the service minimum would be better.

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