Electronics Forum | Fri Apr 11 06:22:04 EDT 2008 | andrzej
Hi Andrzej, > > We are using for BGA (0.8 pitch) > square apertures size 0.4 mm (rounded corners r = > t) and stencil thickness t=5 mils. So area > ration-_ w/4t=0.8 > > Regards Jan Hello Jan, I understand that you have the same pad dimensio
Electronics Forum | Fri Mar 13 17:09:49 EDT 2009 | kmorris
We have found very small solder deposits on the gold fingers of some PCI boards after assembly at our CM. In the IPC-A-610, it says that no contamination or solder is allowed in the critical contact area. 1. I'm looking for feedback on what others
Electronics Forum | Fri Sep 25 16:47:57 EDT 2009 | esoderberg
0.5mm pitch QFP's are typically mixed with large components on all of my boards. I usually use a 6 mil stencil with a minimum aperture width of 10 mils. Normal aperture size is 10 x 50 which causes shorts about 20% of the time. A recent purchase of
Electronics Forum | Tue Nov 17 22:36:17 EST 2009 | rajeshwara
Hi All Plz help , we are manufacturer of Set Top Boxes , where we use ST BGA 5202 ,Paste : ALPHA METAL OM338-T45-LF & STENCIL : 4 MIL & we also tried 5 mil . Problem : At first Test BGA work fine but after some days Assembly dead functional and when
Electronics Forum | Wed Apr 21 17:34:48 EDT 2010 | stepheniii
Does it have to be one for both 1D and 2D? We scan barcodes we print with a 200 DPI printer which works out to 5 mil wide lines with no problem. 2D barcodes need a completely different kind of scanner. I know there are scanners that can do both but
Electronics Forum | Tue Dec 21 11:49:33 EST 2010 | remullis
1st the buyer shouldn't control the process based on cost. Let them buy stuff and stick to that. 2nd, I do think leveling in th HASL process is important. If you have high spots on pads for fine pitch your wiping away more of that aperture than othe
Electronics Forum | Sat Feb 05 12:41:41 EST 2011 | ppcbs
Any distributors or do you know any distributors > that can deliver a T5 Lead solder paste by 01/25 > or close? Thank you to everyone who provided leads. I ended up getting a T5, 63/37 paste. I can't beleive how nice it prints. I'm printing 5 m
Electronics Forum | Fri Feb 03 09:50:37 EST 2012 | mosborne1
Thanks very much everyone. > > I'll try out a > 5mil and see how that goes. If you are using 6mil stencil and you are saying that you need more on the 0603 parts then you might want to look at your squeege pressure. What kind of squeege blades ar
Electronics Forum | Mon May 07 10:42:09 EDT 2012 | saju86ece
Hi, I need one clarification about solder paste printing height tolerance. How to define and fix the solder paste height tolerance after screen printing for inspection purpose. Currently we are using 5mils thickness of stencil, in that we are gave
Electronics Forum | Fri May 09 14:40:38 EDT 2014 | hegemon
I might start with the equivalent 4 or 5 mil stencil and 1:1 on the apertures. If voids are too prevalent, then I would tin the pads of the device, remove the solder, and then solder as above. You may have another hurdle, in that the resulting stan
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