Electronics Forum | Thu Sep 02 10:24:35 EDT 2004 | dj_jago
Greetings from the UK: I have been quite fortunate to lead (no pun intended) our company towards lead free sooner rater than later. One of our customers produces a product which is refurbushed every 6 months or so and sent back into the market. A
Electronics Forum | Tue Aug 15 17:00:52 EDT 2006 | Board House
Bake your solder mask and then solder coat. If you are going to put an immersion finish like Osp, gold, tin or silver you would have to do a Micro etch to clean the copper prior to placing the surface finish. Regards, Board House
Electronics Forum | Tue Feb 16 21:29:18 EST 2010 | actioncontrols
I predict you will have no problems with your soldering. Remember that all plating is only a few microns thick and quickly washed away by the molten solder. We have used white tin, immersion gold, OSG, etc. for quite a while with leaded solder and
Electronics Forum | Mon Jul 28 08:54:52 EDT 2003 | davef
You are 100% correctomundo about ENIG. When it's good it's good, BUT when it's bad, you just want something else. You know you have black pad, when you see parts falling from the board. First, there is not perfect solderability protection. Second
Electronics Forum | Wed Jul 26 10:57:16 EDT 2000 | Steve Schrader
Doug, We've suffered through similar frustrations. One thing we found that might be of some help is uur supplier, unbeknownst to us, was outsourcing their immersion gold. Their supplier apparently lost control of their process for a period of a fe
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 | Fri Aug 26 09:57:21 EDT 2005 | russ
The Immersion gold is not a problem with BGAs specifically but "black pad" which can be present anywhere. The unfortunate thing with BGAs is you cannot see it. Personally I hate white tin. It is okay for single sided boards running no-clean, but c
Electronics Forum | Thu May 15 15:02:03 EDT 2008 | ccross
We have seen this problem before. We have ALWAYS found it to be a board vendor issue. Also, we tend to see it more during the summer months. Our solution has been to bake our PCBs @ 50 deg C for 1 hr prior to use. We use immersion white tin board fin
Electronics Forum | Fri Aug 26 09:48:11 EDT 2005 | David
I have heard that there are problems using immersion gold on PCBs when working with BGAs. Is this correct? Is white tin more suitable?
Electronics Forum | Wed Aug 18 21:25:37 EDT 1999 | Tony Yang
| WE ARE CURRENTLY HAVING PROBLEMS REFLOWING BOARDS WITH WHITE TIN PLATING. WE ARE NOT GETTING GOOD WETTING ON THE PADS. | WE HAVE CHECKED THE REFLOW PROFILE AND TRIED DIFFERENT PASTE'S. | WE THINK THERE MAY BE CONTAMINATION OR OXIDATION ON THE PADS.
