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Bug #5109

reduce solder stop opening sizes for pads of U2, U4 and U7

Added by mschramm about 1 month ago. Updated about 1 month ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
electronics
Target version:
Start date:
Due date:
% Done:

100%


Description

The solderstop openings overlap for the RAM IC, so there are no ligament between - I'm fine with that for a 0,8mm pitch IC.

But let's reintroduce something that has been better in the former design than now: for QFP packages, please reduce the size of the pads' solder mask openings for U2, U4 and U7.

Their pads are (here: FPGA) 0,3, and gap 0,2mm. PCB house would always remove solder stop overlaps on solder pads anyways, so you can use the minimum distance pad copper-solder stop of 0,03mm. If you use this, the remaining segment would be 0,14mm which is about twice the allowed minimum of 0,075mm.

solderstop-FTDI.jpg View solderstop-FTDI.jpg 78.5 KB mschramm, 04/09/2021 01:56 PM
solderstop-FPGA.jpg View solderstop-FPGA.jpg 79.5 KB mschramm, 04/09/2021 01:56 PM
solderstop-RAM.jpg View solderstop-RAM.jpg 82.9 KB mschramm, 04/09/2021 01:56 PM
solder mask expansion rule.png View solder mask expansion rule.png 26.5 KB cibomahto, 04/09/2021 09:41 PM
solder mask gap.png View solder mask gap.png 55.8 KB cibomahto, 04/09/2021 09:41 PM
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History

#1 Updated by mschramm about 1 month ago

  • Subject changed from reduce solder stop opening sized for pads of U2, U4 and U7 to reduce solder stop opening sizes for pads of U2, U4 and U7

#2 Updated by cibomahto about 1 month ago

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This can be accomplished by adding a 'Solder mask expansion' rule that matches pads in U2,U4 and U7. Will apply after the differential pair routing is complete.

#3 Updated by mschramm about 1 month ago

  • Status changed from New to In Progress
  • % Done changed from 0 to 80

Looks good, please go ahead.

#5 Updated by mschramm about 1 month ago

  • Status changed from In Progress to Resolved
  • % Done changed from 80 to 100

works for me - thanks!

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