Electronics Forum: reconition bga ball (Page 1 of 140)

mirco bga stencil opening

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

bga placement w/Fuji IP2?

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

BGA ball crack at pad/solder ball interface

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

Collapsing of micro bga ball due to improper land pad design ?

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

Collapsing of micro bga ball due to improper land pad design ?

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 ?

Collapsing of micro bga ball due to improper land pad design ?

Electronics Forum | Mon Aug 25 08:44:10 EDT 2008 | rameshr

Dear Andrezj, i had attached the photos for ur reference Kindly advice.

Collapsing of micro bga ball due to improper land pad design ?

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

Collapsing of micro bga ball due to improper land pad design ?

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.

Collapsing of micro bga ball due to improper land pad design ?

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.

BGA ball crack at pad/solder ball interface

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

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