Electronics Forum | Thu Feb 17 04:09:19 EST 2005 | greg
The solder adheres to the lands very well so i don't think that problem is with solderability of the PCB. Not wetting to the 0805 terminations. When the problem appeared with the 0805 we chenged the supplier. But there was commnon element Pb-free te
Electronics Forum | Mon Jul 16 16:02:08 EDT 2007 | ck_the_flip
I have zero experience with SN100c, but hey, how much different can it be from Sn63Pb37?! We solder large connectors all the time - sometimes these connectors reside on a ground plane area. We've been able to overcome hole fill issues (on 63/37) th
Electronics Forum | Wed Dec 07 14:55:14 EST 2005 | Samir Nagaheenanajar
Here in Rihad, I am in the midst of Pb-Free implementation, and most of our paste manufacturers have advised that with the higher peak temperatures, you need to retain the activators as long as possible. I have changed our profiles to a more gradual
Electronics Forum | Wed May 14 12:42:16 EDT 2008 | rgduval
Dave, Realized I didn't respond to one of your questions. We pasted and reflowed one board, with no components. This board exhibited extreme dewetting on all pads. The board was LF-HASL, and the paste was Qualitek (which we've used for approximat
Electronics Forum | Fri Mar 23 10:00:38 EDT 2012 | isd_jwendell
I am a big fan of AIM SnPb solder paste. I currently use NC257-2 (no-clean, 89.5%), and recommend you include it in your evaluations.
Electronics Forum | Thu Jun 21 07:21:26 EDT 2007 | chrispy1963
5 mil is perfect for 0402's. If you are printing SnPb solder use apeture reduction such as home plating the pads. However, if youre using SAC, we've found that printing the entire pad works best due to poor wetting compared to SnPb paste. Chris
Electronics Forum | Mon Aug 03 15:49:31 EDT 2009 | gtemkin
Sounds like the Pin in Paste would be a reflow technique not involving a pot. I'm guessing however the same causes are in play, in that the poorer wetting of the Pb-free allow means it drops out of the joint before it can wet to the terminal. We us
Electronics Forum | Tue Apr 17 00:27:48 EDT 2007 | pfifla1
take a look at sn100c, less dross & better wetting than sn/pb alloys.
Electronics Forum | Tue May 10 12:11:27 EDT 2011 | scottp
Do you have pictures and/or cross-sections of the non-wet? Is the HASL SnPb or SN100?
Electronics Forum | Fri Jun 22 11:54:47 EDT 2001 | jdtpfacreate
OEM Boy, This is an excellent question. Since I am on the "I-want-to-sell-you-equipment-side" I do not have the hands-on experience that you do but, I do have a many engineers back at our factory who have dedicated their lives to these issues.
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