Electronics Forum | Mon Feb 21 10:05:33 EST 2005 | Dougs
Our machines can place components down to 16mil, I've never seen any finer pitch components in use, what pitch are they going down to now? 12mil??? What pitches have you been using? We are a contract manufacturer so customers sometimes supply free
Electronics Forum | Thu Jul 25 15:14:05 EDT 2002 | dsorg
In the case where fiducials with a HASL finish are removed from a panel in the depanelizing process, what do most people do for disposing of the rails? Since the HASL finish has lead in it, is it generally required that they be disposed of like print
Electronics Forum | Mon Jul 29 17:07:10 EDT 2002 | dsorg
We remove the fiducials by pushing sideways on them with a hot soldering iron. The copper pad separates from the FR4. We collect them and dispose of them. We have thought of disposing of the rail material with the boards, but our recycler doesn't w
Electronics Forum | Wed May 03 16:37:10 EDT 2017 | charliedci
I don't believe there should be any issues with the HASL finish. The issue is how long on the shelf and is a bake out required to remove moisture from PCB, as in any FR4 PCB's that may have had time to absorb moisture.
Electronics Forum | Mon Jun 03 13:10:35 EDT 2019 | gregoryyork
We recommend a ramp soak spike profile for HASL finish, so everything gets nicely heated during reflow, we soak around 180C and peak at 245- 250C and don't have any issues as long as the levelling isn't too peaky.
Electronics Forum | Mon Jun 28 08:25:54 EDT 2004 | Scott Dodge
What is the difference between a smooth finish organic coated bare copper board for fine-pitch components and HASL finish?
Electronics Forum | Tue Oct 23 03:57:39 EDT 2007 | jkhiew
Thanks Dave. But I do not understand why the solder being wicking away by the component itself. Does Ag/Pd finishes has stronger wettability than LF HASL finishes ? Rgds
Electronics Forum | Fri Feb 04 16:07:38 EST 2011 | pjc
If your peak temps in profiling the Sn/Pb solderpaste are 210C-215C, then no, you will not "weld" to the SN100C finish. SN100C is liquidus at 227C, too hot for most Sn/Pb solderpastes.
Electronics Forum | Tue Nov 01 14:50:05 EDT 2016 | dyoungquist
The bare pcb has lead HASL finish. Components are lead-free and lead-free solder was used to solder the plate-through components. Is this acceptable or will there be reliability issues?
Electronics Forum | Thu Oct 27 06:36:33 EDT 2022 | richardcargill
The PCB needs to have a flat finish to the pads too - HASL finished boards don't work well with fine pitched ICs/QFNs etc
