Electronics Forum | Sun Oct 31 06:42:28 EST 2004 | mattkehoe
Can BGA's really be reliably attached without adding any extra paste? Just use the BGA balls and tacky flux? We are interested in the Pro's and Con's. Seems like a lot of different opinions out there.
Electronics Forum | Mon Nov 01 07:39:49 EST 2004 | Bob R.
Yes, you can place a BGA in flux and get good reflow. However, depending on BGA type and size you should expect a yield loss due to coplanarity issues. Having the paste on the pad definately helps your yield.
Electronics Forum | Mon Nov 01 11:29:30 EST 2004 | davef
There is no IPC requirement for reworking BGA with either paste or just flux. While we generally use flux only, general consensus is that both methods work equally well. Adding solder paste, while more difficult, should result in larger package stand
Electronics Forum | Mon Nov 01 15:35:25 EST 2004 | Ken
Agreed. You will find different part manufacturers have different coplanarity specs. In fact I have on supplier that calls out 7 mil max coplanarity. Then factor in board bow and twist and it becomes a real joy.
Electronics Forum | Mon Nov 01 00:57:01 EST 2004 | Chua
Hi, I have a strain check equipment, but the unit in "�e". Can someone help me how to convert the strain unit in "�e" to "Kg". By the way, what do this unit "�e" mean. Thanks.
Electronics Forum | Mon Nov 01 17:27:07 EST 2004 | Dreamsniper
Hi davef, Will the ion chromatography be able to quantify then identify where and what the contaminant is? Is this a destructive type of testing or the PCB will remain intact right after the test? thanks for the inputs. dreamy
Electronics Forum | Mon Nov 08 15:17:35 EST 2004 | caldon
The EMPF published a nice article, now old but relative, to Cleanliness. www.empf.org Under Technical Docs The listing is ... RR0013 - An In-Depth Look at Ionic Cleanliness Testing - August 1993. Cal
Electronics Forum | Wed Nov 03 18:54:40 EST 2004 | jysam
i'm asking that how should we choose between RTS should be used in my process or RSS?
Electronics Forum | Thu Nov 04 08:44:49 EST 2004 | davef
Look here: http://www.tkb-4u.com/articles/soldering/benefitrtsprofile/benefitrtsprofile.php
Electronics Forum | Tue Nov 02 08:24:31 EST 2004 | bpevear
We are looking to have some PCBs (bare and assembled) independently tested for cleanliness. Our mfg facility is in Malaysia. Can anyone recommend a test house capable of testing to IPC-6012, IPC-5701, etc.
