Electronics Forum | Wed Apr 27 02:22:08 EDT 2005 | grantp
Hi, There are a number of things you can try. You are already using 1:1 hole to pad ratio, and that's good as you need the size. I would try an electroform stencil as that will have a smooth side of the aperture and help paste release. Don't use c
Electronics Forum | Sun Mar 28 22:17:36 EST 2004 | Grant Petty
Hi, I would also be interested in this thread, but our problem has a different twist to it. We have good results from our reflow with Koki no clean paste, however when we pass the boards through the wave solder machine, the flux in that leaves a fog
Electronics Forum | Fri Jun 15 11:05:17 EDT 2007 | grantp
Hi, This is a little embarrassing asking this question, as I think I am profiling our oven incorrectly. I have been using the profile based on the solder paste specification, however we have been getting a large BGA chip coming more unreliable, and
Electronics Forum | Thu Aug 10 12:14:12 EDT 2000 | Charles
It looks like a giant dpak device but with 5 leads. The problem is that on approx 3% of our boards one more pins are open circuit. It appears that the pins are not in contact with the pads. Board is HASL finish IR oven Paste Koki 953i. If you have a
Electronics Forum | Sat Jun 12 00:34:00 EDT 2004 | kanwal324
Hi ! The main problem being faced currently is formation of solder balls - to be precise, these are micro solder beads generally found attached with bodies of SOTs, Chip Caps, Chip Resistors, between pins of SOICs (50 mil) - lying on PCB surface,
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 | Sun Jul 26 05:56:28 EDT 2015 | spoiltforchoice
http://www.surfacemountprocess.com/solder-paste-printing-process.html this site has some pretty good general advice for the novice. I am in no way affiliated with it and I have no idea as to its eventual commerical aims (if any). ENIG if your produc
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