Electronics Forum | Wed Jul 14 16:59:52 EDT 2010 | swag
Solder paste on the pads will keep part aligned. If you do not use paste, you will need to apply tacky flux. You should not run without one or the other.
Electronics Forum | Thu May 05 16:18:47 EDT 2005 | jimmiem
The black pads that we see are on the BGA component. We removed the component from its site and on 2-3 pads 100% of the ball stuck to the pad on the PCB and the corresponding BGA pad was black.
Electronics Forum | Wed May 04 13:13:43 EDT 2005 | Jimmie
We have seen the black dot on the BGA pad after the component has been removed from a PCB. When most likely could this corrosion have occurred, while the component was in storage, during manufacturing of the unit? We have a number of these BGA's th
Electronics Forum | Thu May 05 16:02:43 EDT 2005 | russ
I don't believe that you are seeing black pad. I think you are seeing an oxidized pad from your statement that these pads take solder. I would guess that these will be fine. But I would re-tin all pads prior to attaching the BGA to make sure.
Electronics Forum | Wed May 04 22:04:55 EDT 2005 | davef
First, you cannot determine if this is "black pad" by looking at it. You must do laboratory analysis, either microsectioning or EDS. [But it sure sounds like "black pad."] Second, if it is black pad, it was created by the company that fabricated t
Electronics Forum | Thu Jul 10 22:46:08 EDT 2008 | davef
We'd like to see pads on the board that closely resemble those on the interposer.
Electronics Forum | Thu May 05 11:55:52 EDT 2005 | jimmiem
Was it determined what caused the flux migration?
Electronics Forum | Thu May 05 17:23:54 EDT 2005 | jimmiem
Thanks Russ and Dave for time and patience. Best regards jm
Electronics Forum | Mon Dec 07 14:55:41 EST 2015 | clydestrum
So I have an issue coming up that I'm not too sure how to handle. A board was designed with the wrong footprint for a 3-lead transistor in which the single-lead side has a much larger (think thermal pad for qfn) copper land than what is meant for the
