Electronics Forum | Wed Nov 21 15:02:46 EST 2007 | jlawson
From info I have been told from design standpoint, via in pads helps with managing EMC issues with working design, in particular for high speed digital/dense populated type PCB's. We had a manufacturing customer that had very low yield because of th
Electronics Forum | Mon Jul 26 18:01:30 EDT 1999 | Earl Moon
| Presently protos of micro-bgas (80i/o) pitch .030/.031 | 12BGA per assembly | | The board is a (.062, 4 layers) FR-4 using Dry film | Pads .014inch | Vias within footprint .020inch | Vias to be filled by bottom side(solder side) only .030in dia. F
Electronics Forum | Fri Jul 13 18:25:09 EDT 2007 | seankim10
It sounds like more has to do with plating. you may also check out the voiding issue especially if you have new FAB or the supplier. I had problems with a RF chip in QFN package due to insufficient grounding that voiding caused. This ground is often
Electronics Forum | Mon Oct 23 16:35:31 EDT 2006 | stepheniii
And does it's job very different from a light pen. A light pen senses the light from the monitor and the computer then sees which pixel is lit at the time the light pen detected it. Don't forget only one pixel is lit at any given time. So the unplug
Electronics Forum | Thu Jul 09 12:47:09 EDT 2009 | janz
Hello, We are using F4G software for our Fuji machines. We've 5 machines plug into PC. Recently we tried to connect PC to local network but this only after while close C/C server without possibility to reopen C/C server. Reseting PC gives C/C lice
Electronics Forum | Mon Nov 13 12:17:58 EST 2017 | slthomas
Hi All, We have a new customer with a new design asking for us to leave the center VIP (8 mil drill) on a 9 ball uBGA (.5mm pitch) unplugged. What are my options should I be unable to convince them that this is going to be problematic? Obviously it
Electronics Forum | Fri Feb 22 14:22:07 EST 2008 | stevek
Are you using nocleans, especially when you get to SMT? Years ago, I had OA wave flux get into vias that were plugged from the top under parts. It is really difficult to clean small, high aspect ratio vias. Cross sections showed that the copper in
Electronics Forum | Fri Jun 11 03:14:03 EDT 2010 | muarty
Thanks Dax, We currently employ a stencil aperture design pretty much similar to that you describe. And you are correct in what you say about the thermal demands almost dictating the allowable voiding level. We have suggested to our customer that th
Electronics Forum | Wed Jul 07 13:41:42 EDT 1999 | Dave F
snip | | If you go for plugging be sure you have a protrusion spec that you can live with. This often results in little bumps of epoxy that can interfere with component placement. For us, tenting .015 vias usually gets us about 80% coverage from
Electronics Forum | Tue May 07 14:47:31 EDT 2013 | ngineer
Z axis seems to move as it should, the flag that goes through the C shaped sensor is not broken. I have gotten it to stay on everytime i start it up now (I did NOT change anything, just unplugged it for awhile, then plugged it back in an flipped the
