Electronics Forum | Thu Oct 12 09:22:12 EDT 2006 | charless
Hi We are experiencing different failure modes between leaded and lead free through hole assemblies. The boards are PTH. In the case of lead free boards we are seeing fracturing of the component legs much earlier than we do with leaded assemblies. N
Electronics Forum | Fri Oct 13 03:29:46 EDT 2006 | AR
Hi Could you specify what you mean by fracturing component legs?
Electronics Forum | Mon Oct 16 11:25:11 EDT 2006 | charless
Yes of course. The leg of the component breaks between the top of the solder joint and the component body. We can induce the same failure mode with lead free joints but usually after 10x longer on vibration.
Electronics Forum | Mon Oct 16 15:46:24 EDT 2006 | slthomas
The wording in your second post re: lead vs. lead free behavior seems to contradict your first post, but I'll assume you mean that the lead free boards fail sooner during vib. testing. My question is, if this is the case, are the parts that are fai
Electronics Forum | Tue Oct 17 03:13:10 EDT 2006 | charless
Apoligies Steve if I did not explain myself clearly. We have made the same design using the same RoHs compliant components (which I am assured by the suppliers are process temperature capable) with both lead and lead free solder. Without wishing to
Electronics Forum | Mon Apr 21 09:01:38 EDT 2003 | russ
Wave solder - Initially high cost but after that it is relatively cheap. Selective soldering with a solder pot such as the Air-Vac PCBRM models - Much lower cost than wave but if you get the right nozzles it is a great process. Solder preforms - s
Electronics Forum | Sat Dec 11 09:17:57 EST 1999 | varen blake
pls. send me more info on a no-clean process i would like to know more about this.
Electronics Forum | Thu Jul 05 19:37:15 EDT 2007 | davef
We assume the three leads are lined-up perpendicular to the wave. Without taking corrective action, we know this: * 50 thou pitch will bridge * DIP do not bridge As a corrective action that doesn't invovle a respin of the board, decrease the solderm
Electronics Forum | Thu Jul 05 10:41:37 EDT 2007 | realchunks
Hi BR, Are you screen printing adhesive to the bottom of the board? If so, have your stencil make put openings between the leads of the thru-hole part. SMT adhesive acts as a natural solder resist. So placing a small sliver between the pads works
Electronics Forum | Tue Nov 13 14:14:58 EST 2012 | rway
Try Digi-Key. Mouser and Newark might have what you need as well.
