Electronics Forum | Mon Jul 21 09:57:29 EDT 2008 | davef
We use a ministencil with a QFN pattern that is very similar to the orginal stencil. Here's a link to one of the better white papers on QFN rework: http://www.intersil.com/data/tb/TB389.pdf QFN with less than a 2 thou standoff are less reliable tha
Electronics Forum | Mon Aug 11 11:13:05 EDT 2008 | davef
So, how did you get some parts going one way and other parts going another way? It would be highly unusual to receive a reel packaged that way. No, don't send the data sheet. We can see that Vcc is on pin 8 of the part. What pin of this component do
Electronics Forum | Mon Aug 11 07:27:32 EDT 2008 | eyalg
We had experienced two (2) A BGA which fail (detached) off the board. Surprisingly we noticed that most of solder joints remains on the board leaving perfectly exposed and clean pads on the on BGA package (virgin pads) . Note: No mechanical stress wa
Electronics Forum | Mon Aug 11 10:47:40 EDT 2008 | dphilbrick
Sounds like bad BGA's to me. I suspect this is rare but you can get black pad on the BGA attach pads just like you get them on a PCB. Do you have un-processed BGA's?(still in package) I would have one tested (not by the manufacturer)!
Electronics Forum | Wed Sep 03 11:42:21 EDT 2008 | robinj
If the tarnish is really dark, it is very difficult to remove. Since it is yellowish it is only in the early stages. Replating will definitely work. I have used sulfuric acid based cleaners to remove this yellowish color. But rinse well and dry quick
Electronics Forum | Mon Aug 25 16:48:14 EDT 2008 | petep
Any tips out there for effective LGA rework? How is solder best re-applied? Can these parts be sent out like BGA's for "re-balling"? Like all of you, we build, profile place and solder for reliability, but the time will come when one of these co
Electronics Forum | Mon Sep 29 09:31:18 EDT 2008 | davef
No fixture needed. Look here: * http://curiousinventor.com/guides/Surface_Mount_Soldering/QFP * http://www.infidigm.net/articles/solder/ * http://video.google.com/videosearch?sourceid=navclient&ie=UTF-8&rls=GGLC,GGLC:1969-53,GGLC:en&q=soldering+qfp
Electronics Forum | Mon Sep 29 14:42:04 EDT 2008 | davef
Why didn't you say that in you original posting? Among the better suppliers of rework systems are: * SRT http://www.vjelectronix.com/vjebeta/products.asp?title=Rework%20Solutions * AirVac http://www.air-vac-eng.com/ * Metcal http://www.metcal.com/
Electronics Forum | Thu Oct 02 18:01:43 EDT 2008 | davef
Weller� WLSK1000 QFP Lead Repair Kit * [CooperTools PO Box 728, Apex, NC 27502; http://www.coopertools.com ] * [Practical Components, Inc; 10762 Noel St, Los Alamitos, CA 90720; 714-252-0010 F714-252-0026 http://www.practicalcomponents.com/tools_supp
Electronics Forum | Wed Nov 12 04:34:17 EST 2008 | kywl
Hi all, Assuming that i were to design a PCB and there are multiple components, what is the minimum spacing required to ensure that i won't have problems in my SMT process later on? Also, is there a minimum component stand-off height spec as well?
