Electronics Forum | Fri Apr 19 08:46:04 EDT 2002 | geoff_goring
I would like to discover more about Zinc/Lead diffusion in the leadframes of SOIC ASICS.
Electronics Forum | Mon Apr 29 10:07:00 EDT 2002 | geoff_goring
I need to find out about tin/lead diffusion and how this causes solderability problems in device lead-outs. This is not to be confused with an earlier thread of Zn/Pb diffusion - unfortunately this is was a typo.
Electronics Forum | Mon Apr 29 22:32:59 EDT 2002 | davef
See, I didn�t bite on you zinc diffusion trick that you tried to pull last week. Understand, in this response, I am NOT trying to bust you. I�m trying to determine what you are looking to understand. [Some times I get so locked into talking a cert
Electronics Forum | Tue Sep 21 06:46:58 EDT 2004 | davef
Background on activation energy for diffusion can be found: * Materials textbooks * College lectures posted on the web. Use 'google' or someother search tool. As a guideline, the higher the activation energy, the harder is is for diffusion to occur
Electronics Forum | Thu Jan 26 09:01:32 EST 2006 | Chunks
Mercury vapors are pretty good. Also, if you can build n some day light diffusers for natural sun light to come in. It works pretty well. Use a diffuser as clear glass may cuase vision problem with equipment if under direct sun light. Been there.
Electronics Forum | Fri Aug 07 08:18:24 EDT 2020 | astra
Zones inside diffusers rusted , I am planning to do coating please suggest which type of coating & material I can select?
Electronics Forum | Thu May 07 19:29:40 EDT 2009 | kareal
Hi Davef, Do you means it is natural for tin diffusion to copper trace during SMT process? but I could not detect tin in UHAST T=0 unit, and the tin diffusion was found only in copper trace of C4 cage. Two question: 1) Could you tell me which pr
Electronics Forum | Tue Nov 09 23:52:31 EST 1999 | chartrain
Could very well be your nitrogen diffusers are blocked. These have to be cleaned on a regular basis as well.Cleaning frequency for the diffusers is flux dependent as well as other factors but could be as little as one month of operation. Once the dif
Electronics Forum | Mon Sep 20 16:15:11 EDT 2004 | davef
The activation energy for diffusion for molded with novolac, biphenyl or multifunctional epoxy mold compounds and air are not equal.
Electronics Forum | Mon Feb 27 09:09:36 EST 2006 | davef
Silver on your copper or brass part is a solderability protection. The silver diffuses into the solder and you solder to the base metal, either the copper or brass in your case. Soldering to copper is well known. The issues are soldering to brass
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