Electronics Forum | Wed Oct 29 22:41:42 EST 2003 | msimkin
Our design team have got a problem. We need to either drill out 6 vias/pads for a BGA site, or remove the solder balls form the BGA before they are palced. ( std eutectic) Has anyone used a vendor to remove balls from BGA (0.75mm piutch, ball size ap
Electronics Forum | Thu Oct 30 00:12:13 EST 2003 | Grant Petty
Hi, Another option we have used here in house is to remove the unwanted BGA balls with solder wick, and then to manually place them on the PCB foot print. This eliminates the pick and place machine's optical centering freaking out because the balls
Electronics Forum | Thu Jun 23 11:56:51 EDT 2005 | wjxingggg
Hi, all. There is one 0.8mmX0.8mm QFN on almost of our PWBAs. But the quality report showed that we got bad solder quality for this component. My question is which elements are the root cause for this situation frequently? Thanks.
Electronics Forum | Thu Jun 23 17:59:02 EDT 2005 | davef
Jason: We'd like to help, but we don't know how to diagnose "bad solder quality". It's too broad of a complaint. Please be more descriptive, like: * Too much solder * Too little solder * Solder has too sharp of wetting angle
Electronics Forum | Thu Feb 02 08:54:43 EST 2017 | emeto
Hello all, I was just wondering if solder pot temperature affects the quality or the life of the solder joints? For example we run 100Sn at 275C. If I bump it up to 300C, what is that going to change?
Electronics Forum | Mon Feb 06 07:10:45 EST 2017 | emeto
I was actually thinking about the wave soldering machine.
Electronics Forum | Wed Jun 29 16:30:13 EDT 2005 | RICHM
.0025" under the part, all should be avoided
Electronics Forum | Fri Feb 03 07:06:22 EST 2017 | emeto
It makes sense. With temperature viscosity will change, and more liquidus material will flow better.
Electronics Forum | Wed Feb 08 08:59:17 EST 2017 | emeto
Thank you all for the feedback. DaveF, thank you for the articles.
Electronics Forum | Mon Jun 27 09:38:30 EDT 2005 | Bob R.
What problems are the quality people seeing? I hope they aren't expecting a toe fillet. QFNs are typically cut from an array after plating. This leaves exposed copper on the sides of the part. We'll often see smearing from the sawing process that
