Electronics Forum | Sat Jun 19 00:49:17 EDT 2010 | mun4o
Hi all, lately ofen I have problem with cracked ceramic capacitors.We use 0805 and 0603 cap. Samsung.ICT measure diferent capacity of nominal.If I tray to desoldering component , then component cracked.I think , that the reason is the moisture in com
Electronics Forum | Fri Jun 25 05:34:40 EDT 2010 | ppcbs
Hi iv40 Try with NIC ceramic capacitor that was tested in wet process. We hav succeed with these cap after we found some failure with Kemet ceramic Cap which tested in dry test process while manufacturing.
Electronics Forum | Fri Jun 25 09:18:23 EDT 2010 | flipit
Thanks, Dennis. That is a good idea, but I > have problem :) - our logistic department lookig > for cheap components...What other mnfg of cap you > use? Regards, The capacitor dielectric material might be something you could look at also. COG,
Electronics Forum | Fri Jul 09 19:09:52 EDT 2010 | rway
A couple of things: Does the cap break if you try to remove it with hot air? If not, than you are breaking the caps do to mechanical stress. We have had similar issues. I don't think your board is suffering from mechanical stress from depaneling o
Electronics Forum | Mon Jul 23 09:55:26 EDT 2018 | mgerrior
have not seen this issue personally, often identify cracks on MLCC parts but never dark spots. May be worthwhile to replace as a precaution if at all possible.
Electronics Forum | Wed Feb 05 10:51:17 EST 2003 | bradlanger
Thanks for responding. Do you think I could have my oven profile too aggressive
Electronics Forum | Tue Jul 01 07:08:33 EDT 2003 | iman
suggest you check the preheat conditioning in the wavesolder process is sufficient, as this is the main culprit for micro-crack CAPs ?
Electronics Forum | Fri Feb 28 10:02:39 EST 2003 | bradlanger
Thanks for all the input on this thread. My company bought an FKN depanalizer and that solved our problem. I am also working with our design engineers on laying out the boards without the caps near the edges.
Electronics Forum | Fri Feb 28 16:23:39 EST 2003 | genny
If you can't get rid of all caps near the edges, don't forget Neil's advice above regarding parallel vs. perpendicular. I have seen a 90 degree rotation make a huge improvement in the reliability of some caps.
Electronics Forum | Fri Apr 18 16:53:25 EDT 2003 | takfire
DST, What was the crack signature? Was the crack parallel with the internal electrodes or 45� with the terminal electrode? It is also important to determine the orientation of the failed caps on the PCB (in regards to depaneling). Perhaps the cap
