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 | Wed Apr 06 12:21:14 EDT 2011 | ripper
Hi, I am process engineer in PCBA factory.I have a question about gold plating on BGA.I want to know difference soldering performance between gold plating electrolytic and ENIG.Many thank for any idea.
Electronics Forum | Wed Apr 06 13:43:14 EDT 2011 | mosborne1
ENIG is the way you need to go. With ENIG you deposit a lot less gold. Too much gold will cause soler problems. Matt www.americancircuits.com
Electronics Forum | Thu Apr 07 02:38:20 EDT 2011 | aungthura
I didn't know the difference for BGA. We found solderability probelm as show in attach.Then, we called to PCB maker and they said that it could be caused because of PCB finishing. Do you agree this probelm was happend because of PCB finishing? Unfor
Electronics Forum | Thu Apr 07 09:04:19 EDT 2011 | mosborne1
First of all you need a new board house. You should quote us http://www.americancircuits.com. This really looks like a poor drilling operation with the blow holes. Blow holes are usually caused by two main problems. Improper drilling and/or moisture.
Electronics Forum | Wed Jan 09 17:14:48 EST 2002 | mregalia
Do you bond with Al or gold wire? What happens if the Ni is over 150 microinches? Thickness of nickel is one those things that we have not been consistent with. The industry seems to pretty much universally call for 100-200 microinches. Our old board
Electronics Forum | Mon Jan 07 20:37:15 EST 2002 | davef
For soldered areas, we like to keep gold thickness substantially below the maximum you propose. Search the fine SMTnet Archives for our discussions on the topic of acceptable levels of gold with solder connections. Let�s fix this �no one seems be s
Electronics Forum | Wed Jan 09 15:24:49 EST 2002 | mregalia
Thanks Chris. As I was writing my last message our mailperson dropped off the latest issue of Circuit Assembly. It has an article on mixing SMT and COB on the same board. The author recommends as a compromise 10-20 micro inches of gold over 70-100 of
Electronics Forum | Tue Oct 07 12:35:10 EDT 2008 | andy_pal
Hi All, I am using COB on my DOUBLE SIDED PCB. lastly we used Eletrolytic Ni / Flash Gold Plating. Our Boards vias Failed the UL corrosion Test. we did some cross-section analysis and found 10.75 �m of Nickel and 0.022 um of Gold and as the Process
Electronics Forum | Fri May 17 10:53:15 EDT 2013 | davef
ENEPIG or Imm Pd? Concerns about palladium as a solderability protection are: * Palladium is more difficult to process in fab than gold * Palladium solder alloys can be brittle, similar to gold, without proper soldering process and/or specification/
