Electronics Forum | Fri Jul 11 08:17:22 EDT 2008 | aj
Hi Dave, Yes that is correct. I had a XRF carried out on some boards that I am having solderability issues on and the report came back with 0.04um - 0.05um as the measured gold thickness. Previous batches that went through fine measured 0.07-0.11u
Electronics Forum | Mon Feb 19 18:57:49 EST 2001 | davef
Expanding on the limit of the portion of gold acceptable in a solder connection [mentioned in an earlier post]: The embrittlement culprit, AuSn4, is 29 weight percent gold. So even if one had 100% tin as the solder alloy and 10% gold were dissolved
Electronics Forum | Thu Feb 15 19:41:38 EST 2001 | davef
What do you mean by "But after performing temperature cycle test, the former aging rate (from the shear strength ) seems faster than the latter."? Comments are: I can't recall having heard the term "precipitation hardness" [not that that means anyt
Electronics Forum | Tue Dec 11 19:48:37 EST 2007 | arun2382
Hi, If I were working with a 75 um thick stencil, Is there a spec. as to what the maximum value allowed on actual solder height measurements? Stencil type: Laser cut and electropolished Solder paste type: Type 4 Sn-Sb Would the measured values va
Electronics Forum | Fri Oct 08 17:12:31 EDT 1999 | Dave F
| Hi, | | Does anybody know what is the minimum gold plating thickness on the PCB goldfinger required by the industrial specifications - IPC, Bellcore, etc. Where can I find the information? Appreciate for the help! | | Thanks, | Tony | Hi Tony:
Electronics Forum | Thu Oct 07 20:34:48 EDT 1999 | Tony Huang
Hi, Does anybody know what is the minimum gold plating thickness on the PCB goldfinger required by the industrial specifications - IPC, Bellcore, etc. Where can I find the information? Appreciate for the help! Thanks, Tony
Electronics Forum | Tue Jun 28 19:56:59 EDT 2005 | davef
Matt: Yes, if the gold was really thick, it could appear like your pictures. In measuring gold plating thickness, we'd want to use xray fluorescence [XRF]. For alternatives, look here: http://www.pfonline.com/articles/pfd0027.html
Electronics Forum | Tue Jul 15 16:30:57 EDT 2008 | boardhouse
Hi Aj, Recommended Immersion gold thickness would be 3-5 Micro inches over 140 -200 micro inches of Nickel. Thicker Immersion gold than 5 micro inches can cause solder joint embrittlement. Gold readily dissolves in molten solder and will be present
Electronics Forum | Thu Jul 10 09:16:41 EDT 2008 | aj
Hi all, What should the typical gold thickness be on ENIG boards ? aj...
Electronics Forum | Tue Jun 28 16:41:07 EDT 2005 | mattkehoe
Yes, .062 fr4. Like I said before, we run a lot of gold boards, as many as 25% of what goes through the shop, and we've never adjusted anything before??? Many of these are bigger by 2 X and much more dense. Reflow is not as shiny as HASL but always u
