Electronics Forum | Sun Jun 29 15:03:04 EDT 2008 | jensteele
I was referring to the HASL supplied by the supplier...specifically Lead Free HASL. I've been searching the web and I cannot find a thickness specification like we have for ENIG and Immersion Silver.
Electronics Forum | Tue Sep 02 09:32:45 EDT 2008 | eliezerk
In order to check pcb quality by HASL TIN thickness plating repeatability, looking for any specification for the above.
Electronics Forum | Wed Sep 03 07:36:39 EDT 2008 | vladig
That is why it has to be a few micron thick. Otherwise, it will form a layer of intermetallic which is extrremely difficult to solder to. Vlad
Electronics Forum | Wed Sep 03 11:52:58 EDT 2008 | stepheniii
But Vlad was talking tin and Davef gave intermetalic thicknesses which Vlad said needs to be avoided by having a few microns of tin. I'm not 100% sure but I suspect that DaveF is not convinced that Vlad knows what "intermetalic" means.
Electronics Forum | Sat Jul 25 08:47:25 EDT 2009 | davef
Both "moisture content of bare board" and the "thickness of the copper plating in the PTH" are related to each other. As you heat the solder connection, moisture in the board boils and out-gasses through the solder connection. Plating with the proper
Electronics Forum | Tue Aug 03 17:13:41 EDT 2010 | bradlanger
Craig, If it is LF Hasl it sounds like it applied too thin exposing the intermetallic layer wich is not solderable. We call out a minimum thickness of 80 microinches and have good results. We have had shops in the past that did not control the Hasl
Electronics Forum | Mon Aug 30 14:46:56 EDT 2010 | davef
Sure, you should be able to measure the copper oxide thickness on the inner layers of a PCB when doing sections.
Electronics Forum | Mon Jan 23 21:25:39 EST 2012 | gaz
Is there a different thickness of screens we should be using for smaller components (sod523 / sot23 / 0603) or new pastes? Thanks.
Electronics Forum | Wed May 09 04:17:49 EDT 2012 | umar
HI SMT Forum, Right now I am looking for the equipment to measure of my coating thickness that apply to the PCBA process. my chemical type is use acrylic and polyurethane type. If any one of the forum knowing about that, I would like to have on you
Electronics Forum | Thu Sep 20 10:05:35 EDT 2012 | guyramsey
What is the state of the art in electroplated gold flash a a surface finish; thickness and tolerance limits?
