Electronics Forum | Wed Jan 26 14:33:47 EST 2000 | Glenn Robertson
Tuan - How about Sn/0.7Cu? It's M.P. is 227 and it's readily available. If the leads are Gold plated you might consider pre-tinning them. If you need a higher temp alloy any of the major solder companies can help - I suggets you start with Ind
Electronics Forum | Wed Jan 26 13:43:06 EST 2000 | Tuan Bui
221 degree C) to achieve good wetting and shiny filet. Comments and recommedations are welcome.
Electronics Forum | Wed Jan 26 21:30:06 EST 2000 | Dave F
Tuan: Consider Sn 96.5/Ag 3.5 or Sn10/PB88/Ag02 also. As Glenn says, you had better get rid of that gold or you will never have a shiney connection. Not that a shiney connection means anything about the quality or reliability of your soldering. M
Electronics Forum | Wed Apr 12 17:44:16 EDT 2000 | Rick
Glenn and Paul have hit the nail right on the head. Continue working with your solder vendors. I know that many people have succeeded with what you are trying. And the Pb-Free push is only making things better for you as companies develop just wha
Electronics Forum | Thu Jan 27 14:16:14 EST 2000 | Tuan Bui
I've tried Indium NC-SMQ92(96.5Sn 3.5Ag) on these MCMs and achieved only marginal wetting on pads and parts. The good wetting is what I try to achieve, shiny is what my engineers want (Prototype environment). Does pre-cleaning the PWBs in ultrasonic
Electronics Forum | Sun Jan 30 21:56:05 EST 2000 | Paulvannan
We used Promosol Sn96.5/Ag 3.5 during our initial qualification for similar application. We could not achieve a shiny solder joint. Our changes to Sn95.5/Ag 4.5 does not improve the look. In order to confirm the reliability of the joint, I suggest yo
Electronics Forum | Thu Jan 27 14:49:53 EST 2000 | Glenn Robertson
Tuan - One of the reasons I suggested pre-tinning (aside from the negative effects of Gold on appearance and reliability) is the known slower wetting of Sn/Ag and Sn/Cu alloys as compared to Sn/Pb. If you don't have to be Lead-free, the high Lead
Electronics Forum | Mon Dec 06 03:54:57 EST 1999 | Chris May
Hi Russ, I have a similar situation. I have been told that this can be caused by the nickel, over which the gold is plated, can result in suspect joints, embrittlement etc. Some joints can even be weak and broken without much force on some of my boa
Electronics Forum | Tue Apr 13 08:08:33 EDT 1999 | Rob Palson
We process both tin/lead plated boards and gold plated boards in our surface mount group. I have used Sn62/Pb36/Ag2 solder paste on all gold plated boards to help prevent gold scavaging. To reduce the amount of different solder pastes we have to bu
Electronics Forum | Wed Aug 06 16:35:31 EDT 2003 | Carol
This is an old topic, but keeps coming up. Solderability and reliability issues with SMT gold plated terminations when used with tin/lead solder paste/hassle finish PWB. I need to know which standard (mil, IPC, J-STD??) tells you all about the probl
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