Electronics Forum | Tue Sep 21 11:34:10 EDT 2004 | davef
Several things to check are: * Ask Multicore if their flux res and your conformal coat are compatible. Conformal coats and NC flux res are notorious for having compatibily issues. * Conformal coat a bare board to determine if there is there is enoug
Electronics Forum | Wed Jul 09 15:09:36 EDT 2003 | davef
Matt: What are we looking at in pix F2?
Electronics Forum | Wed Jul 09 16:05:46 EDT 2003 | davef
Sorry Matt. I mean the last row, second picture in from the left.
Electronics Forum | Thu May 28 22:12:18 EDT 2009 | davef
If your newer board passes a tape test, you should be OK.
Electronics Forum | Thu Feb 11 14:36:42 EST 1999 | Evelyn York
Hey, has anybody experienced problems with solder balls falling off BGA's? I have not been able to identify a contaminant nor any physical problems that would cause this. On packages with 'good' adhesion I have not observed any intermetallic form
Electronics Forum | Wed Jul 09 16:18:51 EDT 2003 | Matt Kehoe
Hi Russ, Thanks for the input. The squeeze out we are reworking is very very thin since it has been flattened so it is actually easier to remove than usual but I agree, with a pad this small it could exert a bit of stress on the bond line if rework
Electronics Forum | Thu May 28 15:54:45 EDT 2009 | elmerito
Hello, We have designed a 160ball bga substrate. Now we want to use the same substrate for the 145ball version of the product. All are the same, the package size, ball pitch, solder ball size only the number of balls will change. We will use a new s
Electronics Forum | Wed Jul 09 05:28:35 EDT 2003 | matt kehoe
Photo's can be found at http://www.sipad.com/ssi_qa/smta/microbga.htm mk
Electronics Forum | Wed Jul 09 15:56:14 EDT 2003 | Matt Kehoe
Hi Dave, Hmmm, pix F2? Do you meran figure 2 or second picture? The second picture is the bare board before printing. Gold plated pads. Is that what you mean? mk
Electronics Forum | Wed Jul 09 16:12:01 EDT 2003 | Matt Kehoe
Right-o Dave, Thats the 2 lifted pads turned upside down so actually you are looking at the bottom of the base copper where it used to be attached to the laminate. mk
.gif)
