Electronics Forum | Wed Jan 16 15:22:29 EST 2002 | Terry Burnette
In his book titled "Manufacturing Techniques for Surface Mount Assemblies" author R.J. Klein Wassink describes the relationship between solder land dimensions, component lead coplanarity, board warpage, solder volumes, and solder paste flux wetting b
Electronics Forum | Mon Jun 05 10:32:39 EDT 2000 | Khalid Saeed
It could be a gold finish problem. The recommened gold finish thickness is less than five micro inches. Gold thickness greater than five microi inches is significant contributor for causing embrittlement of the solder joints. Verify the reflow profil
Electronics Forum | Thu Oct 02 05:07:59 EDT 2008 | arebom
If you have coplanarity issues on components that have not been assembled yet, check out an equipment that will help you resolve the lead coplanarity problem before you load them in your assembly equipment; I know that Fancort sells an equipment for
Electronics Forum | Tue Sep 30 21:00:41 EDT 2003 | davef
We're not clear on what you seek. So, as a starting point for our discussion, we wouldn't get agitated if we saw "routine" coplanarity of 4 thou. For instance: Maximum Lead Coplanarity [Altera] Package||Acronym||Lead material||Finish||Maximum Lead
Electronics Forum | Thu Sep 07 08:44:17 EDT 2006 | vicknesh28
Did check the coplanarity of the failed lead and found it to be as good as the wetting leads.
Electronics Forum | Tue Aug 17 00:42:40 EDT 1999 | ScottM
| Does any one have any idea which is usualy more expensive, to get components on Reels or in Trays ( I mean large components ofcourse). | What is price diffrence percentage ? | | practicaly, is one method is prefered to the other? | | Thanks alot
Electronics Forum | Tue Sep 30 20:05:34 EDT 2003 | afm
Does alloy 42 lead frame on a QFP100 make lack of coplanarity (let's say 2 mils), a critical factor to have non-wetted leads? Lead coating is tin lead 90/10. afm
Electronics Forum | Fri Jul 22 09:01:22 EDT 2005 | davef
We know of no one that provides that service, but manufacturers of coplanairity equipment might be able to give suggestions. Contact: * Synergistech, Inc.; 637 Lowther Rd, Lewisberry, PA 17339; 717-938-9323 800-324-7674 Fax: (717) 938-9364 synergiste
Electronics Forum | Mon May 14 18:59:23 EDT 2007 | mazemach1
I would like to ask anyone who may have use any equipment or device to check SMT socket leads. We have co-planarity problems with these sockets on the boards. The sockets we have are packaged in tubes and mostly the bent leads appear in different loc
Electronics Forum | Fri Nov 13 03:57:41 EST 1998 | Steve Cheung
We are experiencing 'lifting' on one or more sides of a QFP. Poor lead co-planarity has been ruled out by independent tests. Please tell me which of the two remaining failure modes is the most probrable? 1. Expansion of gases in vias underneath devi
