Electronics Forum | Wed Aug 14 09:43:40 EDT 2019 | cyber_wolf
Has anyone seen an AXI machine for under 200K ? We have been seeing 375-600K range.
Electronics Forum | Thu Aug 15 09:36:48 EDT 2019 | davef
It could be delamination of the layered material of the MLCC caused by thermal shock or a component fabrication defect. For more on MLCC cracks: https://www.avx.com/docs/techinfo/CeramicCapacitors/cracks.pdf
Electronics Forum | Thu Aug 15 12:04:42 EDT 2019 | slthomas
Thanks Dave. I am thinking that this may be a case of knit line fracturing. My concern now is, if this is the case, what is the risk to completed product.
Electronics Forum | Thu Aug 15 14:49:42 EDT 2019 | stephendo
Never automatically rule out that the parts were received defective. Although at 1 in a thousand it would be difficult to rule out.
Electronics Forum | Thu Aug 15 15:51:24 EDT 2019 | slthomas
Thanks, Stephen. I'm actually leaning towards that (knit line fractures), since it's the only thing I've found that really supports the fractures being planar like they are.
Electronics Forum | Fri Aug 16 13:49:48 EDT 2019 | slthomas
Thanks Ed. I guess about all we can do is hope that the extreme nature of the flaw equals a higher degree of early detection. So far we haven't replaced any of these on RMA's so I guess that's a good sign.
Electronics Forum | Mon Aug 19 07:42:59 EDT 2019 | robl
At least one of them looks like a handling issue to me - the last picture shows the crack going into the termination as a scratch on the right side - as if someone has slid another board into a magazine without leaving enough space. This one looks li
Electronics Forum | Mon Aug 19 09:42:41 EDT 2019 | edhare
Dave, Perhaps, but my interpretation of that photo is that it simply shows a knit line fracture that propagated out to the surface. The fact that it shows on the termination is not surprising since the termination wraps around the internal plate st
Electronics Forum | Thu Aug 22 23:30:12 EDT 2019 | jandon
Check from the component distributor/manufacturer if they can verify that the component is genuine or counterfeit component. I know a similar case and the manufacturer could not verify the component as a genuine. They could not find the batch number
Electronics Forum | Sat Oct 05 16:29:28 EDT 2019 | davef
CRACKS: THE HIDDEN DEFECT by John Maxwell AVX Corporation - SMTnet Technical Library paper [ https://smtnet.com/library/files/upload/cracks.pdf ]
