Electronics Forum: mismatch (Page 1 of 12)

TCE mismatch

Electronics Forum | Wed Feb 07 21:54:45 EST 2007 | davef

That's a peculiar temperature range for your cycling. What are your ramps and dwells?

FR4 vs Ceramic mismatch

Electronics Forum | Tue May 05 17:01:25 EDT 1998 | bob

I hear that there is a problem with using ceramic parts that are sizeable. Apparently, there is a mismatch in the Temperature Coefficient of Expansion between the FR4 and ceramic materials which causes the soldered erminations to weaken and eventuall

Re: CTE mismatch

Electronics Forum | Fri Sep 15 16:37:49 EDT 2000 | Dave F

Sounds like someone aimin� fo tha big hurt, if ya axes me. Two spots to place your lawn darts are: 1 J Hwang in "Modern Solder Technology � " states (p.354) that " � extreme CTE mismatch between silicon IC (~2) and the PCB (~16), solder connections

Re: FR4 vs Ceramic mismatch

Electronics Forum | Fri May 15 09:07:12 EDT 1998 | Earl Moon

I hear that there is a problem with using ceramic parts that are sizeable. Apparently, there is a mismatch in the Temperature Coefficient of Expansion between the FR4 and ceramic materials which causes the soldered erminations to weaken and event

Re: FR4 vs Ceramic mismatch

Electronics Forum | Wed May 06 09:16:51 EDT 1998 | justin medernach

I hear that there is a problem with using ceramic parts that are sizeable. Apparently, there is a mismatch in the Temperature Coefficient of Expansion between the FR4 and ceramic materials which causes the soldered erminations to weaken and eventua

seeking low cost fix to tce mismatch

Electronics Forum | Mon Dec 27 22:45:58 EST 1999 | Jim

Is there a way to avoid the reliability problems arising from the tce mismatch between ceramic chip smc's and FR4 laminates, without spending an arm and a leg on expensive substrate materials? Are there inexpensive substrates with reasonably compata

Re: seeking low cost fix to tce mismatch

Electronics Forum | Tue Dec 28 12:34:03 EST 1999 | Justin Medernach

Jim, I wouldn't sweat a TCE mismatch between Ceramic chip components and FR4. No need to worry. 99.5% of consumer product out there utilizes this exact technology with no threat of failure due to CTE mismatch. The terminices of the components occu

Re: seeking low cost fix to tce mismatch

Electronics Forum | Thu Jan 06 15:39:57 EST 2000 | Mike Naddra

Jim, The use a a teflon substrate, would mitigate the TCE mismatch you are expierencing. Mike

Re: seeking low cost fix to tce mismatch

Electronics Forum | Wed Dec 29 15:42:34 EST 1999 | Mike Naddra

Justin, I would be currious as to your customers application, and if the temperature delta and rate are great enough to cause solder joint failures as a function of mismatched Tce then you may want to consider that even if you are able to identify

Re: seeking low cost fix to tce mismatch

Electronics Forum | Tue Dec 28 20:31:48 EST 1999 | Jim

Justin, I have a customer who is considering changing from TH to SMT, but his preliminary reliability testing yielded solder joint failures, because his product must endure severe temperature swings. He can't change to an expensive substrate, or he'


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