Electronics Forum | Wed Aug 22 09:17:15 EDT 2001 | steven
if do not have x-ray inspection machine, how to verify the 1st board out from the smt placer that the BGA is placed accurately onto the solder pads. the diameter of the solder ball is 1mm. could it self align during reflow?
Electronics Forum | Fri Nov 07 11:32:36 EST 2003 | Gabriele
we experimented round pad for 0402, it improves chip self alignment and reduce tomb stone effects. On 0603, half round shape also gave guud results. G
Electronics Forum | Wed Jan 21 09:36:52 EST 2004 | davef
As with noclean flux, OSP will fill your probes with crunchy [maybe gummy] stuff. Consider: * Increasing frequency of probe maintenance * Talking to your probe supplier about alternate probes that self-clean better
Electronics Forum | Tue Mar 09 22:06:24 EST 2004 | Ken
Two words that will send shivers down any self-respecting rework professionals spine: HEAT GUN Not affiliated with black and decker or vidal sasoon hair dryers.
Electronics Forum | Mon May 10 13:15:34 EDT 2004 | ccleland
Purex makes a system for air filtration of aqueous washers. I believe the only fully self contained system available. It returns all cleaning solution back to the cleaner and exhausts clean dry air back to the room. You can contact Dick Wilson at Pur
Electronics Forum | Thu Aug 12 14:59:50 EDT 2004 | davef
Russ: Immersion gold [imm Au] is "soft" and it's "gold", but it is NOT "soft gold". Here's the question for your board house: If imm Au is "soft gold" and imm Au self-limits
Electronics Forum | Tue Jun 21 14:15:59 EDT 2005 | tds
I have a self contained fume filtration system (for sale)for reflow ovens that will maintain your desired cfm. What I have heard from customer's is that there will be variations in your profiles thus causing some defects.
Electronics Forum | Sat Mar 25 07:10:12 EST 2006 | davef
We agree with Chris. If your gold is applied properly and is the correct thickness, you will see no difference. One nit on Chris' comments: immersion gold will plate-out [self-limit] around 8 thou, although we've heard 12 thou.
Electronics Forum | Mon Oct 30 14:19:03 EST 2006 | pjc
The USI Prism, http://www.ultraspray.com , machine has self-cleaning function. When you contact them ask about this option.
Electronics Forum | Fri Feb 16 08:28:50 EST 2007 | pavel_murtishev
Good afternoon, Typical plating thickness for immersion tin is 0.6-1.0um. I do not know what the maximal thickness is. But plating is self-limiting process and I believe maximal thickness should be about 2-3um. BR, Pavel
