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 | Fri Nov 01 18:21:50 EDT 2019 | gregcr
I does depend on the level of technology of the PCB. RoHS-HASL for basic products and Silver Immersion for a flat finish, are my preferred.
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
Electronics Forum | Wed Jun 10 17:18:47 EDT 1998 | Igmar Grewar
| Okay, here's a stupid question. What exactly is HASL and OSP? We are going to delve into this technology where I work and I want to utilize the wealth of knowledge here to make life easier. Specifically, what are the differences, the advantages, di
Electronics Forum | Sun Nov 24 10:12:44 EST 2002 | kcorrin
Thanks for your response Dave. I did look at the bare boards after wave solder and they seem to solder fine in that process. I do not see any soldermask bleed on bare boards. Regarding "thin" plating...I have had issues in the past when the board sup
Electronics Forum | Thu Dec 06 10:15:14 EST 2007 | 18424
I am looking for people that are having problems primarily with test of their product after reflow/production. Has anyone experienced a great solder joint but the component still fails test? Has anyone had dewetting of atmel components, pull back of
Electronics Forum | Tue Sep 14 14:22:11 EDT 2010 | grahamcooper22
If the HASL was poor quality and very thin you would find this defect....but you would expect to see it on more pads also. Also, you'd expect to see your solder from your solder paste either dewetted on the pad or reflowed onto the BGA sphere making
Electronics Forum | Thu Nov 01 12:13:10 EST 2001 | jonathan
I guess this clarifies the defect more then looks at the process, but I�ll just through it out there for the sake of learning something new. If anyone would comment on this please feel free�. There are many different varieties of dewetting defects.
Electronics Forum | Thu Aug 31 18:59:55 EDT 2000 | Brian W.
Our customers use OSP, HASL, immersion tin and immersion gold as board finishes. If I recommend a finish to the customer, it is one of the immersion finishes or OSP. Those finishes have the advantage of a flat surface to deposit paste. HASL has va
