Electronics Forum | Tue Nov 04 12:58:17 EST 2008 | smt123
I have to agree with Patrick here. This image appears to show a board that is NOT HASL as there is what appears to be a copper pad in the upper portion of the image. But then again the arrow tip appears to be white and I woudl expect that to be red s
Electronics Forum | Thu Sep 10 15:06:11 EDT 2009 | dyoungquist
My guess is that he is talking about the gold plated pads not fully wetting with solder. We have seen this on some of our ENIG boards with the gold still showing at the far corners of the rectangular pads. Not knowing if this is hand soldering or p
Electronics Forum | Fri Jun 14 14:30:36 EDT 2002 | davef
Assuming you are talking about solderable surfaces: People specify various materials to protect the solderability of the pads on the board. Gold, actually, Electroless Nickel - Immersion Gold [ENIG], is popular. * Board fabricators like it because
Electronics Forum | Mon Aug 16 07:54:05 EDT 1999 | Peter Barton
| | | | One of the DFM suggestions I've seen is to remove the solder mask web, i.e. the mask between pads on 20-mil QFP devices. The rational is that if the mask is thicker than the pad the mask can prevent the stencil from making intimate contact w
Electronics Forum | Wed Aug 18 21:03:41 EDT 1999 | Dave F
| | | | | One of the DFM suggestions I've seen is to remove the solder mask web, i.e. the mask between pads on 20-mil QFP devices. The rational is that if the mask is thicker than the pad the mask can prevent the stencil from making intimate contact
Electronics Forum | Fri Aug 20 03:19:22 EDT 1999 | PeterB
| | | | | | One of the DFM suggestions I've seen is to remove the solder mask web, i.e. the mask between pads on 20-mil QFP devices. The rational is that if the mask is thicker than the pad the mask can prevent the stencil from making intimate conta
Electronics Forum | Tue Dec 15 10:16:55 EST 2015 | mbb
I had a problem with PCB pads: soldering process couldn't be performed because soldering pads of component in the PCB are oxydized. Is there any solutions to eliminate the corrosion on the pads in order to avoid there scrap because we 're talking abo
Electronics Forum | Tue Dec 15 15:21:17 EST 2015 | davef
Peculiar that ENIG boards are corroded, not that it can't happen. * J-STD-002, Solderability Tests for Component Leads, Terminations, Lugs, Terminals and Wires * J-STD-003, Solderability Tests for Printed Boards The first person I'd talk with is my
Electronics Forum | Wed Nov 07 18:37:27 EST 2001 | steven
sometime hand solder can cause also. no necessary have to be paste n reflow.:) now i'm facing bridging on 0402 components pads. any suggestions on spacing distance as we're going to re-design the pcb.
Electronics Forum | Mon Jan 04 22:09:57 EST 2016 | a290668789
It's amazing. I rarely saw that ENIG finish could be corroded. It should be the Nickel corroded issue and then affected the solderability. Not clear how to clear this, if you get the answer, let me know. good luck
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