Electronics Forum | Wed Oct 04 21:21:21 EDT 2017 | duchoang
For some reasons, we need to wash our BGA boards in ultrasonic washer in order to clean all flux residue under BGA. We use Ultrasonic cleaner with 40 KHz. Should we or shouldn't we do that. Pros and Cons ? Any idea appreciated.
Electronics Forum | Thu Oct 05 13:33:28 EDT 2017 | duchoang
We did some tests with good result. No failure physically and functionally. Is there report/study/documents about this procedure so we can convince customer to approve our process using ultrasonic wash. Thank you, Dave
Electronics Forum | Thu Oct 05 12:50:48 EDT 2017 | davef
Why not toss a handful of the component that you're concerned about into your cleaner, clean them according to your board spec and the evaluate what happened?
Electronics Forum | Thu Oct 05 07:11:35 EDT 2017 | emeto
Now you are putting your assembly to vibrate with frequency of 30-60kHz. What kind of flux/paste are you using? If it is NC there is no reason to clean. If it is water wash, you should consider a proper way of cleaning it according to your paste/flux
Electronics Forum | Thu Oct 05 10:25:13 EDT 2017 | davef
Consider ... * National Physical Laboratory (NPL) [http://www.npl.co.uk] did an extensive amount of research on proper frequencies and power levels for ultrasonic cleaning, maybe in late 1980s or early 1990s. That report might help you sort through
Electronics Forum | Thu Oct 05 12:10:36 EDT 2017 | duchoang
Thank you for your replies. We use No-Clean Paste and some customers do not want any residue left around solder joint even so, so little. They want the residue washed completely. If we use water-soluble flux, we still need to wash, anyway. Their conc
Electronics Forum | Thu Jul 14 01:43:09 EDT 2005 | pyramus
Solder paste used was Kester FL250M (no-clean).... components affected were only chip components 0603, no BGA & no IC components.
Electronics Forum | Wed Feb 06 15:51:26 EST 2008 | jax
We have place CSP devices with 0.105mm standoff hights without any issue. The ability to Water Wash all depends on the specifications of your wash... Spray pressure and qty of jets Dwell time, pre-wash/wash/rinse Available detergents or saponifiers
Electronics Forum | Tue Aug 03 18:11:21 EDT 2004 | davef
Improper washing of water soluable flux residues can be a major contributor to flux residues remaining on the board surface. ;-O That you appear to be only complaining about the pathetic state of the ability of your washer to clean under BGA, it may
Electronics Forum | Tue Oct 05 00:10:01 EDT 1999 | karlin
Hi, Help! Could anyone help to enlighten me on this? Question: If I have a CSP/BGA package of size X by Y and the standoff gap between the component and PCB is Z, What is the maximum allowable Y/Z or X/Z that using a normal water clean washing ma
