Electronics Forum | Mon Oct 31 09:18:43 EST 2005 | jdengler
If the board is HASL you may always have trouble. Try to reduce the amount of paste by either reducing aperture size of stencil thickness. Jerry
Electronics Forum | Mon Jan 09 13:41:09 EST 2006 | slthomas
Take a look at the boards, too. Could the HASL be different (in particular a domed or convex cross section) than what you're used to seeing? Is your printer actually working properly?
Electronics Forum | Wed Apr 26 09:15:23 EDT 2006 | Carol Stirling
That would be correct. Some others call it `Head in Pillow'. The BGA balls are 63/37 and the board it's mounting to is HASL.
Electronics Forum | Tue May 02 14:27:43 EDT 2006 | bhall
In the past we have used immersion tin as an alternative for HASL. Our biggest problem was shelf life. The tin oxidized very rapidly. We switched to immersion gold and have had great success.
Electronics Forum | Tue Aug 29 06:56:15 EDT 2006 | Loco
Just another thought, your leaded boards might have been HASL, which for soldering always flows just a little bit better then other finishes.
Electronics Forum | Thu Sep 21 17:39:32 EDT 2006 | Cmiller
We have used it and it seems to be fine. I think we have probably run a few thousand boards with it across maybe 6 different assemblies.
Electronics Forum | Fri Sep 22 04:43:18 EDT 2006 | greg york
Interesting you should ask this what problems are you seeing. Non wetting and blow holes and shallow fillets at all??? Cheers Greg
Electronics Forum | Tue Sep 26 12:04:11 EDT 2006 | sliebl
Is there a difference between SN100, SN100C, and SN100CL?
Electronics Forum | Tue Sep 26 12:36:38 EDT 2006 | russ
Bob should answer this but yes there is a diiference, I wonder if you do not need to add the SN100(cu???) to get your alloy correct again, I believe that additional copper must be added on a scheduled basis. Russ
Electronics Forum | Fri Dec 08 00:02:35 EST 2006 | Jack
Hi all, I found this article (Dealing with "the black pad defect)about reworking bare PCB with black pad symptom...Use HASL to treat black pad..Have you guys try this before?? www.smta.org/files/SMTAI01-Jay
