Electronics Forum | Wed Dec 02 20:11:37 EST 2009 | prodivegsr
Hi Lou, we are using a fluid dispensing machine. our current requirement is around 50um. From the Datasheet,the thinner 73 has a higher evaporation rate of 1.0 comapring with thinner 521 at 0.6... does the higher evaporation rate eliminate the bu
Electronics Forum | Sat Nov 21 12:28:00 EST 2009 | flipit
There is evidence of lead being used in soldering 5000 years ago in Mesopotamia. Not a big issue for most people doing SMT but the poster should also understand why percent metal is adjusted for different solder paste alloys. You print by volume b
Electronics Forum | Fri Nov 20 09:07:43 EST 2009 | Sean
Hi all, Another thing that I would like to discuss here is that I used to come across few reports that mention about the flux residue has great impact on the PCBA impedance, especially when everything become smaller and smaller...I mean, when mother
Electronics Forum | Sun Nov 22 09:36:17 EST 2009 | patrickbruneel
Dave, A low residue/No residue flux does exist that when an excessive amount of flux is applied it would only create a cosmetic problem not a reliability issue. The active ingredients are neutralized by the heat applied in the soldering machine and
Electronics Forum | Tue Jan 26 10:26:54 EST 2010 | bandjwet
Dear SMTNetters: Based on your experiences is it really necessary to have today's YAG laser-fabricated stencils electropolished? I undertsand that this "requirement" is a carry-over from the days of CO2-fabricated lasers where the hole wall quality
Electronics Forum | Tue Feb 02 09:05:41 EST 2010 | rway
First, why are they rejecting the boards? Are they rejecting them based on your acceptable limits or is it due to the standards they are using. Companies typically have standards that the board house must adhere to before shipping the product (depe
Electronics Forum | Thu Feb 04 09:31:21 EST 2010 | llaerum
I was wondering if someone on this forum are in Austin or Dallas. If so could they post the type of SAC305 WS solder they use. I am interested in type 3 and type 4. Due to our current vendors repeatability issues we are trying to find out who the la
Electronics Forum | Thu Feb 11 10:59:09 EST 2010 | sumote
I am having some trouble finding an ESD safe wash basket liner. The trouble isn't finding someone who sells a product, the problem is all 3 products I have evaluated fail testing. All 3 were generators in excess of 2kv with 1 hitting over 4kv! This i
Electronics Forum | Thu Feb 25 15:05:17 EST 2010 | flipit
Multiport nozzles will work better if your pickup is not perfect. Has been a while but are the nozzles 08MPF? I used to pick 0402 chips with 08MPF nozzles. These had 5 holes and were black Delrin plastic. I looked at the 0402 using front lighting
Electronics Forum | Tue Mar 09 14:53:16 EST 2010 | davef
Resistivity Of Solvent Extract [ROSE] is a bulk ion contamination [BIC] test method. It should thought of as a process control tool used to assess ionic contaminants. Don't consider it an acceptable tool for establishing 'GO-NOGO' limits. The stan
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