Electronics Forum | Wed Feb 22 10:00:58 EST 2006 | dougs
We've just set up a couple of products with 0.5mm pitch uBGA devices on them, i went for 5thou thick, laser cut nickel (to aid paste release) square pads same size as the diameter of the uBGA pads. Or you could go to a 4 thou nickel stencil, better
Electronics Forum | Thu Sep 12 10:45:29 EDT 2002 | pbarton
We have used a laser cut stencil 0.15mm (0.006") thick with 0.3mm (0.012") square apertures radiused in the corners 0.06mm (0.0025") to aid paste release. This approach with the (type 3) paste we use has proven successful on thousands of devices plac
Electronics Forum | Thu Feb 08 08:28:11 EST 2007 | mzaboogie
Good Morning Everyone, We have an application coming up with several BGA's on a RoHS assembly. One is a 25 mil ball on a 40 mil pitch, another is a 15 mil ball on a 40 mil pitch. In the past for leaded assemblies, we have used square apertures for 1
Electronics Forum | Wed Mar 16 09:06:07 EST 2005 | russ
This is what I might do, I would purchase either a solder volume (preferred) or at the least a paste height measurement piece of equipmment, The most important parameters with pronting are volume and registration. You need one of these inspection
Electronics Forum | Thu May 01 09:19:59 EDT 2003 | davef
ehess Why do YOU want to block apertures to keep solder from pads?
Electronics Forum | Sun Dec 12 09:10:44 EST 1999 | Jerry
What the D Pak stencil?
Electronics Forum | Wed Apr 30 21:18:55 EDT 2003 | davef
Morris Why do want to do this [keep solder from pads]?
Electronics Forum | Thu May 01 07:17:35 EDT 2003 | davef
Why not fill the apertures with paste and let the paste dry-out? We have found that a hammer and chisel are very effective for removing dried paste.
Electronics Forum | Thu May 01 13:56:45 EDT 2003 | kmorris
Dave: After the stencil was made with apertures for a connector on this PCB, it was discovered that the connector would have to be handsoldered after SMT reflow. If the solder deposits are left to reflow on the pads, it makes it difficult for the o
Electronics Forum | Mon Apr 28 09:53:10 EDT 2003 | kmorris
I've got a set of apertures on a stencil that I would like to "plug" or block off. In the past we've done this with Kapton tape, but since this location is close to a fine pitch component, the thickness of the tape prevents good gasketing at the fin
