Electronics Forum | Thu Jun 02 06:23:08 EDT 2011 | alcatel
1 chip has 2 solder pads....and both pads definitely has solder.... im not getting what you are trying to say.
Electronics Forum | Thu Jun 02 06:23:40 EDT 2011 | alcatel
1 chip has 2 solder pads....and both pads definitely has solder.... im not getting what you are trying to say.
Electronics Forum | Fri Mar 24 06:08:54 EST 2006 | PhilJ
Try using via pads as fiducials. This will avoid the problem of drilling accuracy.
Electronics Forum | Wed Mar 23 22:29:21 EDT 2011 | nkinar
I have a few prototype circuit boards with BGA footprints where some (but not all) of the vias have been placed too close to the pads. During reflow, some of the solder from the balls flowed into the holes. Only one of the pads under the BGA is not
Electronics Forum | Thu Mar 24 16:06:34 EDT 2011 | nkinar
Thanks for the reply, davef. Due to prototyping time constraints, I've been asked by the engineers if I could do something on the SMT line to salvage this prototype PCB. Could I do anything to connect the pad or fill the via? Much of the board h
Electronics Forum | Wed Jun 01 15:50:59 EDT 2011 | markhoch
I don't believe that particle size of the solderpaste will offer you any relief from this issue. The solder flows into the via, leeching away from the desired solderpoint, after the solder has become liquious. The chemical make-up of the solder contr
Electronics Forum | Thu Jun 02 10:54:12 EDT 2011 | davef
Al: We agree with AVFOM. You have a different problem than solder paste mesh selection. Most often, tombstoning occurs when the wetting forces on the two pads are unequal. Examples of things that can cause this are: * Pads are different * Board pad
Electronics Forum | Wed Sep 05 21:51:32 EDT 2018 | cannizzaro
I was wondering when creating Gerber drill file from Kicad there is an option to merge PTH and NPTH holes to a single file. How should this value be selected? Since I'm planning to use the prototype service in ALLPCB, and the Gerber is needed
Electronics Forum | Thu Sep 06 05:23:14 EDT 2018 | netvicher123
In KiCad, in the dialog for generating drill files, there is a checkbox "Merge PTH and NPTH holes into one file."
Electronics Forum | Mon Jul 08 14:41:17 EDT 2002 | davef
See what happens when you take a couple of days off? Your theory sounds reasonable, but someone else could make an equally valid case that you are blasting your solder plug across the room with the force of the expansion of entapped air between th
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