Electronics Forum: ceramic capacitors (Page 1 of 21)

SMD ceramic capacitors dark spots

Electronics Forum | Fri Jul 20 17:38:06 EDT 2018 | mikedcmt

We have some MLCC capacitors that show some discoloration, or spots. Does anyone know if this will affect reliability? Caps test good - and assemblies function perfectly.

SMD ceramic capacitors dark spots

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.

SMD ceramic capacitors dark spots

Electronics Forum | Mon Jul 23 11:02:56 EDT 2018 | mikedcmt

Thanks for your reply - parts in tape have similar markings - gets worse after reflow. ~20% have this issue. Units pass test no problem. Occurrence is random.

SMD ceramic capacitors dark spots

Electronics Forum | Mon Jul 23 10:56:38 EDT 2018 | dleeper

I've never seen this before and I would be suspicious. Have you tried to dust it off with a brush or Q-tip, it might just be some sort of process contamination. Have you looked at the reel to see if the parts are coming in with these spots from the

wave soldering surface mount tantalum and ceramic capacitors

Electronics Forum | Thu Feb 04 09:09:07 EST 1999 | dave

Can anyone help me with the pros and cons of trying to wave solder tantalum and large (1812) ceramic capacitors. I do know that one may see fractures on larger cermaic caps, but have not seen much on the tantalums. Any insight as to what problems I c

Re: wave soldering surface mount tantalum and ceramic capacitors

Electronics Forum | Fri Feb 05 09:39:58 EST 1999 | Dave F

Can anyone help me with the pros and cons of trying to wave solder tantalum and large (1812) ceramic capacitors. I do know that one may see fractures on larger cermaic caps, but have not seen much on the tantalums. Any insight as to what proble

Re: wave soldering surface mount tantalum and ceramic capacitors

Electronics Forum | Tue Feb 16 16:28:30 EST 1999 | Tuffty

Can anyone help me with the pros and cons of trying to wave solder tantalum and large (1812) ceramic capacitors. I do know that one may see fractures on larger cermaic caps, but have not seen much on the tantalums. Any insight as to what

Cracks on ceramic capacitors.

Electronics Forum | Fri Jun 20 10:27:19 EDT 2003 | Cristiano Dick Smiderle

Hi We are experiencing serious problem with ceramic capacitors. They are with low electrical resistence and the problem is intermittent. We found some of them with micro cracks but not all. What could be the causes for this problem? We are su

Cracks on ceramic capacitors.

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 ?

Cracks on ceramic capacitors.

Electronics Forum | Fri Jun 20 12:44:18 EDT 2003 | sasha

We had this problem with 0805 0.1 mF also. This problem was only with this capacitor. We have replaced all these capacitor after the ninth occurrence. My opinion - it is a defect of the manufacturer. Please inform the manufacturer of your capacitor.

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