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 Post subject: DRC - additional clearance checks
PostPosted: 02 May 2017, 13:02 
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Joined: 20 Jun 2015, 14:39
Posts: 946
As far as I can tell DipTrace's DRC can not be set up to check for same-net SMD/Pad-to-Via clearance requirements (please correct me if I'm wrong). IPC-7351 has a 0.50mm "Good Design" recommendation for minimum clearance between an SMD or PTH pad and a same-net via, which is supposed to reduce potential reflow soldering difficulties caused by power plane heatsinking. I'm guessing this doesn't apply to fanouts, especially in cases where BGA space constraints dictate using a via-in-pad solution or limit fanout via distances. Perhaps two more options named [X]Check Same Net SMD to Via and [X]Check Same Net Pad to Via could be added under the Options tab of the Design Rule dialog window. These two checks would need to ignore any special circumstances such as the two previously mentioned cases.


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