Electronics Forum: cte (Page 1 of 13)


Electronics Forum | Sun Jun 13 09:01:39 EDT 2010 | rajeshwara

What role CTE plays in BGA soldering?


Electronics Forum | Mon Jun 14 16:56:12 EDT 2010 | davef

physics and hos*

CTE mismatch

Electronics Forum | Thu Sep 14 14:37:45 EDT 2000 | Serrena Carter

Does anyone know where I can find good rule of thumb information on soldering/brazing. I am most interested learning the maximum recommended CTE mismatch between two different materials that thermally cycle between 25-100C.

CTE Versus Tg

Electronics Forum | Mon Dec 18 18:14:20 EST 2000 | Dave F

In older resin materials used in printed circuit board fabrication, there seemed to be a direct relationship between CTE and Tg. Now with more modern resins that reationship no longer appears clear. Please comment.

CBGA CTE Mismatch

Electronics Forum | Thu Aug 17 22:22:29 EDT 2000 | C.J. Long

Hi erverybody: I am from a PCB shop. One of our product is with 19 X 19 ceramic BGA and my customer is experiencing 0.1 - 04 % failure of open trace on cornoer BGA pad. Substrate is FR4 with TG 135 degree C and delta Tg is well below 3 degree C. Tra

Paste-in_hole and CTE

Electronics Forum | Wed Jul 26 18:23:47 EDT 2000 | Gary

I have been following forum discussions here and eslewhere, attended technical sessions at APEX and have been experimenting with the paste-in-hole process on some of our new product. I have run into one problem I have never seen mentioned, that is a

Re: CTE Versus Tg

Electronics Forum | Mon Dec 18 22:28:03 EST 2000 | Charles Harper

I believe this is the case for the new,high performance LCPs(liquid crystal polymers),which are unique in their stiff,relatively thermally immobile structures.For other materials with higher Tg values than FR4,the basic relationship holds,but expansi

Re: CBGA CTE Mismatch

Electronics Forum | Mon Aug 21 20:20:18 EDT 2000 | Dave F

Hi CJ: I guarantee you that the portions of you BGA that will physically move the most as a result of changing temperature are the corners. For this very reason, many BGA have BT substrates that have a tg of 210�C. I would demonstrate the potentia

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: Paste-in_hole and CTE

Electronics Forum | Thu Jul 27 21:34:41 EDT 2000 | Dave F

Gary: That's curious. Tell us more about your process steps, temperature profiles, paste, warping of the board without the PIH processing, components, etc

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