Electronics Forum | Mon Sep 24 20:49:59 EDT 2001 | jagman
I'm not seeing this during the wave solder process, rather the REFLOW (convection) process. The board was design with the vias located "in" the land area.
Electronics Forum | Fri Nov 09 10:15:27 EST 2007 | devajj
Of course if you are an OEM you could go back to your design engineers and tell them via's in SMD pads is unacceptable. Put that in your DFM design guidelines. If you are an EMS provider you can also influence your customer by explaining the impa
Electronics Forum | Wed Nov 14 14:44:10 EST 2007 | grantp
Hi, Those via's sure do sound large, and I think the designer must have made a mistake in the PCB design do you think? From looking at our PCB designs, if we moved to via in pad, it would really reduce the size of the PCB, so this is an important i
Electronics Forum | Tue Nov 13 09:32:28 EST 2007 | kpm135
For the simple fact that the via in the middle of the pad causes the solder to wick into the hole instead of flowing out across the pad and part. Thus cause insufficient solder issues.
Electronics Forum | Thu Nov 15 08:25:08 EST 2007 | rgduval
I do think that the designer goofed, and used too large vias. I believe he only used on size via on the entire board, regardless of whether it was in a pad, or out on the board. I have seen vias in pad work, though. From a manufacturing standpoint
Electronics Forum | Mon Nov 05 07:22:02 EST 2007 | aj
Hi, We have had this before - yes they can be plugged and metalised on top . aj...
Electronics Forum | Tue Nov 20 06:02:11 EST 2007 | mattkehoe
http://www.sipad.com/sipad_vip.htm mk
Electronics Forum | Fri Nov 23 17:33:11 EST 2007 | mika
English => Swenglish, is not so good... Ds.
Electronics Forum | Tue Nov 13 20:29:03 EST 2007 | grantp
Hi, What size via's are you guys seeing, as the ones in our products are incredibly tiny, and via's are very small now days. The via's on the boards we have are dramatically smaller than the pad on an 0402. Grant
Electronics Forum | Tue Sep 25 12:49:58 EDT 2001 | Hussman
Been there - done that. Makes a mess on that 2nd reflow process- doesn't it!?!?!? This is caused by design. If the open via is located in the land area, it will flow thru the via and cause pumps on the opposite side. You can have your vias filled
