Electronics Forum | Mon May 10 16:37:01 EDT 2004 | davef
First some definitions, the two main types for solder masking near BGA pads are: 1 Pad, Non-Solder Mask Defined. In circuit board design, pads with spacing that does not allow solder (usually bumps) on the pads to contact the adjacent solder mask. [
Electronics Forum | Thu Dec 07 10:10:49 EST 2006 | Learn from U
Hello, I need your advice..Welcome any input!! Cheers..
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
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 | Mon May 10 11:24:33 EDT 2004 | Charly
Encounter solder ball crack after reflow, found the solder ball is out of shape after reflow, cross section view found that the solder mask opening is not good ( when we do comparason with diff. supplier substrate.) Does the solder mask shape will af
Electronics Forum | Thu Feb 21 13:08:06 EST 2002 | vincent_f
Hello, I had recently a problem of crack between the solder ball (SnPb) and the Ni layer of the PCB pad. We use Electroless Ni/Au technology for PCB. This phenomena is amazing because the crack is very clean (straight) and it creates a space betwee
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 | Fri Feb 01 14:23:47 EST 2002 | delnosa
Looking for help on getting information on understanding the physics of micro-fracture growth rate within the BGA ball (or solder joints in general). Hoping to find a fairly straight forward study on the concept/theory of this topic. I'm not a meta
Electronics Forum | Wed Nov 29 01:12:12 EST 2006 | callckq
Dear Davef, Thanks for your input...The crack happen at the pad/solder ball interface..Pls review the new thread that I post just now with title called "BGA BALL CRACK AT PAD/SOLDER BALL INTERFACE" Thanks!
Electronics Forum | Thu Oct 25 04:58:58 EDT 2007 | wayne_
I think the not fully melted BGA ball is the main problem. The middle of the BGA IC...the ball not fully melted....when it subjected to heat and cause PCB warpage....the partial melted joint in the middle part of the BGA started to crack...bcos of we
