Electronics Forum | Thu Oct 14 06:27:45 EDT 2004 | davef
a disturbed solder joint. * Extended/slow cool down ramps can result in surface texture => grainy solder joint. Second, the "BGA scaling" could be a reflection of: * Too little heat (incomplete solidification) OR * Too much heat (excess grain growt
Electronics Forum | Fri Jun 25 11:29:43 EDT 2004 | tcp
We have had some field returns of a double sided SMT board manufactured in the February timeframe. The boards are encapsulated in an epoxy potting. When removing the potting some SSOP devices came off in the potting. The leads had pulled out of th
Electronics Forum | Thu May 13 14:41:17 EDT 1999 | Michael N.
I need some pics or documentation on how a finish soldered joint looks like for SMT component. I have various people who supposedly says has knowledge with High Temp says my joint could look better. The joint looks shiny and great except for a grainy
Electronics Forum | Tue Apr 10 13:12:41 EDT 2001 | davef
You've told us nothing about your situation, process, boards, or anything!!! If you leave some boards with very fine solder connections on the shelf for a cuppla years, the grain will become coarse. What do you mean when you say "grainy"? What is
Electronics Forum | Tue Mar 15 09:46:06 EST 2005 | davef
Comments are: * J-STD-001 and A-610 committees have eliminated the requirement that solder joints be "bright and shiny". Certain metallizations (such as gold) can influence the solder joint surface texture, but have no impact of reliability. Reliance
Electronics Forum | Wed Jan 23 17:14:33 EST 2002 | Shawn
We have seen solder joints that have an orange peel or textured appearance to them after running over our wave solder machine. We thought it may be disturbed solder joints but it does not have the lines or appearance that a disturbed joint usually sh
Electronics Forum | Fri May 14 00:34:22 EDT 1999 | Mike D.
| I need some pics or documentation on how a finish soldered joint looks like for SMT component. I have various people who supposedly says has knowledge with High Temp says my joint could look better. The joint looks shiny and great except for a grai
Electronics Forum | Mon Nov 25 18:43:29 EST 2013 | hegemon
Without the proper tools in house you will not be able to determine anything but the most obvious problems. At minimum, some side looking microscope that would allow visual inspection of a row or two, and to be able to rule out bridging. Using that
Electronics Forum | Fri Jul 23 09:12:34 EDT 2004 | davef
We have run not AgPd [that we know of]. We can comment on PdNi. [But you're probably have Ni under the AgPd] In general, palladium solution rate is much slower than other sacrificial finish materials that we use for the purpose. The key then is to
Electronics Forum | Tue May 08 15:05:08 EDT 2001 | davef
It�s reasonable to want to understand this strange looking fabrication, before moving on to other issues. Before moving on to that, tell us more about your thinking the silicon being from the BGA package. What kind of plastic package is this? Desc
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