Electronics Forum | Mon Jun 15 20:37:29 EDT 2020 | travishemen
Try sending your boards to rework before SMT and have them remove the excess solder from the fiducials. It usually works great until someone accidentally removes the entire fiducial.
Electronics Forum | Tue Mar 15 22:04:56 EST 2005 | KEN
The hasl joint looks fuller (and is easier to inspect)because it has more solder volume. Think about it. Your pre-plating your board with solder (before you add more solder). I doubt your getting 0.3 mils of hasl.....probably more like 1.3 to 3.0
Electronics Forum | Wed Jan 24 10:08:36 EST 2007 | electronhose
Immersion Silver, ImAg, is becoming the finish of preference. This is due to it having similar process limits vs. SnPb HASL. There were some early concerns about shelf life, but new chemistries have extended finish shelf life to 12 months+. Many boar
Electronics Forum | Wed Jun 24 16:51:25 EDT 2020 | kumarb
Hi. Taking this from a total different angle - why not use ENIG to avoid this issue but find more competitive suppliers? We source from offshore all the time and finding that due to this dreaded virus - the market pricing is soft. Many are willing to
Electronics Forum | Tue Mar 15 09:46:06 EST 2005 | davef
Comments are: * J-STD-001 and A-610 committees have eliminated the requirement that solder joints be "bright and shiny". Certain metallizations (such as gold) can influence the solder joint surface texture, but have no impact of reliability. Reliance
Electronics Forum | Thu Nov 09 23:27:53 EST 2000 | Craig
We are considering using gold plating on our fine pitch pcbs (as oppossed to HASL). We have heard of long term solder reliability problems with joint imbrittlment how bad is this and does it apply for all of the different plating processes the same?
Electronics Forum | Thu Aug 04 15:53:07 EDT 2005 | GS
Hi Ted, look at this tread: Lead-free solder alloy: SN100C from AIM solder then see note of Bob Gilbert (from FCT Assembly) you can have from him very interesting documentation CD about HASL made by SN100C alloy Regards GS
Electronics Forum | Mon Jul 05 03:44:53 EDT 2004 | johnwnz
Dave, I'm going to disagree with you on the ENIG, it's my 3rd choice only just beating out OSP for that 4th spot. 1. Immersion Silver - cheaper than ENIG, as flat and no issues with Brittle interface (black pad) or Gold Embrittlement) Longer shelf l
Electronics Forum | Tue Aug 24 14:49:58 EDT 2004 | jamyboy
Hi, I am trying to assemble a LTCC component > with Pd/Ag surface finish on to Sn/Pb/Ag solder > and Sn/Ag/Cu solder. I am passing it through a > reflow. I have observed poor wettability at the > solder-pad joint. Does anyone have information
Electronics Forum | Fri Aug 13 16:54:20 EDT 2004 | davef
If the terminations on your components are not barrier plated, you must be very careful about the amount of time you stay above liquidous. As you'd expect, longer is not better. The longer you stay at liquidous, the more of the component terminatio
