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
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
Electronics Forum | Thu Dec 30 21:22:12 EST 1999 | Jim
Mike, Thanks for the reply. It's not really a matter of slope. It is the long term thermomechanical fatigue that the solder joint undergoes as a result of repeated severe temperature swings, while the product is in use. Non-leaded parts are suscep
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
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
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'
Electronics Forum | Thu Jun 25 06:02:41 EDT 1998 | Chiakl
Hi there, Does any one know what is TCE for fully wet saturated FR4. I came to know that for Dry FR4 the TCE is about 15-19 PPM �C. Is that true? Appreciated for your help. rgs, chiakl
Electronics Forum | Thu Jun 25 15:33:51 EDT 1998 | Earl Moon
| | Hi there, | | Does any one know what is TCE for fully wet saturated FR4. I came to know that for Dry FR4 the TCE is about 15-19 PPM �C. Is that true? | | | | Appreciated for your help. | | rgs, | | chiakl | Chiakl, | It looks like you are speaki
Electronics Forum | Mon Feb 25 07:59:47 EST 2002 | Jim Mills
Customer has requested a custom CBGA pakaged resistor network.I've seen a lot of info about TCE mismatch but aslo have heard that using 0.025-0.030 balls offers some stress releif which allows for the TCE mismatch to become less of a problem. Would
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?
