Electronics Forum | Wed Jun 25 11:53:01 EDT 2003 | gmurray
Does anyone have a listing of recommended usage requirements on SMT components. Can you use SMT resistors which are over 3 years old for example ? Can you use ICs which are not known to be moisture sensitive but which are over 5 years old.
Electronics Forum | Thu Aug 12 18:06:09 EDT 2004 | SR
May I ask what component types you are using and who the suppliers are? FYI - If the components have exceeded their shelf life, they may have oxidized too much for soldering using low activity fluxes. Thanks and best regards, SR
Electronics Forum | Tue Jul 06 08:04:01 EDT 2004 | ANDREW
Thanks Dave, The surface finish is ENIG.Is it ok not to bake even though the HIC has changed color? What is the shelf life for ENIG boards?
Electronics Forum | Wed Sep 01 11:06:59 EDT 2004 | Frank
I don't think you answer all my questions concerning modifications and shelf life after SMT process. With the experience you have, could you please give me a clear answer please. Frank
Electronics Forum | Wed Dec 15 10:48:23 EST 2004 | gopinath A
I heard that Steam Aging (storage) tests would be inappropriate for gold finishes. Is this a correct statement? If so, what are the reasons? How bad is the shelf life of ENIG
Electronics Forum | Wed Mar 02 09:19:33 EST 2005 | Indy
we use SENJU M705. type3 solder paste. Has a good shelf life.
Electronics Forum | Thu Oct 27 08:38:04 EDT 2005 | jdengler
Simply leave the paste out at the end of the shift for the next days use. Keeping the paste refrigerated just prolongs the shelf life. Even if you are at the expiration date leaving the paste out for 36 hrs won't make any difference. Jerry
Electronics Forum | Thu Nov 03 09:20:29 EST 2005 | russ
Unforunately, the only one who can give you that answer is the manufacturer. They are the only ones who know what is in their paste and how it reacts to different situations and conditions.
Electronics Forum | Tue May 02 14:27:43 EDT 2006 | bhall
In the past we have used immersion tin as an alternative for HASL. Our biggest problem was shelf life. The tin oxidized very rapidly. We switched to immersion gold and have had great success.
Electronics Forum | Wed May 03 15:56:25 EDT 2006 | Board House
Hi Patrick, Thank you for the info, We like to push ENIG, for us being the ENIG line is in house it is cheaper to use than the carbon, plus shelf life of the Carbon is an issue in Storage. Pre-application. Thanks again, Mike
