Electronics Forum: bga pad (Page 1 of 107)

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 | 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.

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 | 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 | 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.

stencil thickness for bga

Electronics Forum | Mon Oct 13 19:04:47 EDT 2003 | davef

Aperture size should vary with the component [pitch]. That size should be the same a the pad size. So, generally pinching is not required. Indium discusses BGA apertures on their site [ http://www.indium.com ]

cost effective bga remove

Electronics Forum | Wed Mar 17 14:59:53 EST 2004 | Claude_Couture

since there is a bit of humor in this thread, try drilling the pads from the opposite side of the pcb.

underfilling of bga

Electronics Forum | Fri Mar 19 10:06:22 EDT 2010 | karlo

Rework is typically done by heating the BGA to 170-180C to first scrape off the fillet. Then, heat to above reflow, and lift the BGA. Then, collapse the solder with heat and flux. Then, back down at 170-180C, scrape off the underfill from the boar

pad cratering

Electronics Forum | Wed Jul 01 04:54:28 EDT 2015 | jvercamm

hi, the last post on pad cratering dates from 2012. We have (likely similar) problems with a RoHS 783 solder ball BGA size 29x29mm^2 (organic package BT), pitch is 1mm and solder ball diam is 0.5mm the field failure is after 12 months, almost exclu

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