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
Electronics Forum | Mon Jul 22 16:33:55 EDT 2002 | blnorman
Anyone know of a paste supplier that can provide the 42Sn/1Ag/57Bi alloy? Supposedly HP has done some work with this specific alloy and we would like to evaluate it. Neither Alpha Metals or Kester can supply it.
Electronics Forum | Tue Aug 02 11:58:44 EDT 2005 | GS
Are the pick up nozzles metal made (ironmagnetic material)? Some time magnetic residual on metal nozzles can generate pbm like that when chips terminations have nickel and when SOt or similar packages have terminal A42 alloy made. Time ago got pbm l
Electronics Forum | Sun Jun 27 06:27:15 EDT 1999 | Vic Lau
| I am looking for a way to clean solder off of QFP packages. I'm thinking a chemical method would be easy, as long as the chemistry doesn't attack the leads themselves, or the package. | Any suggestions? | Dear Matt, I have a customer, who is com
Electronics Forum | Mon Jun 28 14:36:34 EDT 1999 | John Thorup
| | I am looking for a way to clean solder off of QFP packages. I'm thinking a chemical method would be easy, as long as the chemistry doesn't attack the leads themselves, or the package. | | Any suggestions? | | | Dear Matt, | | I have a customer
Electronics Forum | Wed Jan 14 10:07:38 EST 2004 | Patrick
More on QFP soldering issue as per Paul f original e-mail. 1. Problems occured on different PCB's, on different lines using different equipment 2. Flux residue is common in the dimple on the solder. 3. The fault occurred using both "Kester 265" & "Al
Electronics Forum | Tue Apr 20 20:11:58 EDT 2004 | davef
First, how oxidized are these solder balls? Will the take solder using your routine flux / paste? Second, on restoring solderability, the three basic methods you can use to restore solderability on components are: * Highly active fluxes in a retinn
Electronics Forum | Mon May 10 20:46:25 EDT 2004 | davef
The three basic methods you can use to restore solderability on components are: * Highly active fluxes in a retinning operation. * Surface stripping chemistry and then a standard retinning operation. * Electrochemical conversion chemistry and then a
Electronics Forum | Mon Nov 30 21:28:54 EST 2009 | davef
"Environment Friendly Electronics: Lead-free Technology", J Hwang, Electrochemical Publications, 2001 [0901150401], Chapter 6.2, contains a significant amount of data on 58Bi/42Sn that may help you better understand the 58Bi/42Sn solder alloy. We'r
Electronics Forum | Sat Nov 03 11:20:35 EDT 2012 | davef
EricR: There's substantial information about the properties of solder alloys on the web. Here's an example of something that I clipped from one site Alloy ||Solidus (°C)||Liquidus (C°) ||Tensile Strength (psi / MPa) Sn42 Bi58||-E-||138||8000 / 55.2
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