Electronics Forum | Thu Sep 12 10:45:29 EDT 2002 | pbarton
We have used a laser cut stencil 0.15mm (0.006") thick with 0.3mm (0.012") square apertures radiused in the corners 0.06mm (0.0025") to aid paste release. This approach with the (type 3) paste we use has proven successful on thousands of devices plac
Electronics Forum | Tue Jul 13 00:40:44 EDT 2004 | Darren
Yes of course we are doing placement of BGA's with an IPII. However there is no front lighting so you can not inspect the balls. If the silhouette is square enough there is no problem with alignment. Just use the largest nozzle that will fit on the p
Electronics Forum | Wed Nov 29 00:43:45 EST 2006 | callckq
Dear all, Recently, we run 2 models with heat sink attachment on top of this BGA(on top of this BGA, there is flip chip attached at the center of the BGA). Hence, the center of the BGA is higher than corner/side. We used conventional way to attach
Electronics Forum | Fri Aug 22 00:20:29 EDT 2008 | rameshr
Hai, In our process we are using the micro bga of size 13X13mm of pitch 0.45mm,after soldering process the bga found collapsed, we absorbed that the PCB land pattern of the BGA was not in array, uneven distribution of pads (area) & most of the pads
Electronics Forum | Fri Aug 22 03:19:08 EDT 2008 | andrzej
Hi, what do you mean by collapsed ? Can you describe or send a photo ?
Electronics Forum | Mon Aug 25 08:44:10 EDT 2008 | rameshr
Dear Andrezj, i had attached the photos for ur reference Kindly advice.
Electronics Forum | Mon Aug 25 10:36:05 EDT 2008 | davef
Yes, it's peculiar that the layout of this board is so disorganized * Pads are not round, uniform, or the same size * Exposed traces have different thickness
Electronics Forum | Wed Aug 27 00:20:38 EDT 2008 | rameshr
Dear davef, Will u pls advice what are all the possible defects caused while soldering ( assembling ) this type of boards.
Electronics Forum | Wed Aug 27 08:25:24 EDT 2008 | davef
We'd expect to see: * Solder starved connections at pads with large trace/pad areas. * Less reliable solder connections at pads that do not match the shape and size of the corresponding pads on the component.
Electronics Forum | Thu Dec 07 14:23:30 EST 2006 | russ
I wuld say it is attachment method and post install force that is the problem not the size of the heatsink. we place heatsinks that are at least 5 times the size of BGA with no issue, they are attached with very precision torque drivers. Russ