Electronics Forum | Fri Sep 03 11:28:18 EDT 2004 | KenF
Fine crack in multi-layer ceramic capacitor (MLCC) may not be detectable by capacitance check.Could anyone out there advise which is the most appropriate method to test/detect fine crack ?
Electronics Forum | Fri Sep 03 16:47:40 EDT 2004 | davef
Rob's comments make sense. Responding to your question: * Sometimes you can see a resistance change * Sometimes you can see a leakage change
Electronics Forum | Mon Sep 06 04:42:18 EDT 2004 | KenF
Thx for the replies. Acutally I am doing a process related study to see whether the process (pcb depanelling)can induce crack to an MLCC. After depanelling, I will do a thermal shock on the MLCC based on IEC 384-1, that is, five cycles of 30min at hi
Electronics Forum | Fri Sep 03 11:45:15 EDT 2004 | rlackey
Hi Ken, I know this doesn't help in the immediate timescale, but isn't avoidance the best form? can you trace the cracking to a process issue (Solder profile, shock damage, handling damage, probe/ATE damage)or a chip cap manufacturing fault? I can'
Electronics Forum | Thu Sep 09 04:51:19 EDT 2004 | Simon UK
65%), if one failed on the board i replaced all of them, and re-tested and thermally cycled them inline with our spec (-55/+80 Deg/C for 48hrs) this was a nightmare, especially when some cracks were not detected until several weeks later while flying
Electronics Forum | Wed Sep 27 12:44:52 EDT 2000 | Ashok Dhawan
What could be possible resons for " Plating Crack on Barrel (tented via)" This tented via is in proximity to parts being hand soldered. The crack in barrel was detected on failure analysis - micro-section of via where barrel is having crack ( circul
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 | Tue Sep 10 01:56:53 EDT 2019 | itrueriko
I got solution to manufacturer to find out the crack of MLCC if the manufacturer need it.
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 03:19:30 EDT 2019 | sssamw
Clear pictures of failed MLCC could help investigation.
