Electronics Forum | Mon Sep 18 11:55:35 EDT 2000 | Ricardo Fuentes
Hi! cold someone advise me about the minimum gap allowable in between 0404 parts. The minimum distance is because of the behavior on reflow, the re-work difficulty or anything else. Thanks
Electronics Forum | Mon Sep 18 20:51:35 EDT 2000 | Dave F
A fairly dense brickwall would have 0.020" (0.05mm) spacing
Electronics Forum | Tue Jun 07 16:25:29 EDT 2005 | davef
We use a 0.012 inch gap betweem 0402 pads.
Electronics Forum | Thu May 29 16:37:57 EDT 2008 | aj
10% reduction on 5 thou. Gap between pads is also critical with 0402's.
Electronics Forum | Tue Jun 07 19:24:44 EDT 2005 | russ
We use a .010" - .012" gap with .020" square pads.
Electronics Forum | Thu May 29 17:19:51 EDT 2008 | dyoungquist
On 0402s we use 20x25 mil pads with a 15 mil gap between the pads on the pcb with ENIG finish, 5 mil stencil with a 1:1 aperture (20x25 mil) and SAC305 lead free solder paste. We very rarely see any tombstoning on 0402s using this setup.
Electronics Forum | Fri Dec 08 16:54:42 EST 2006 | flipit
My experience with SMT LED packages is that certain LED package styles tend to float. This floating is caused because the LED is often only terminated on the bottom side of the LED package. Sometimes the LEDs are terminated like a SMT resistor with
Electronics Forum | Thu Apr 11 20:35:22 EDT 2002 | davef
Messy. Messy. Messy. Consider gluing these components, until you control your process. It is unclear to us that a single factor drives these defects, but multiple factors that need to be tuned to work well together. PAD DIMENSIONS * Some SM-782 pa
Electronics Forum | Sun Jun 10 11:31:27 EDT 2001 | nifhail
Everybody aware of the tomb-stone problem on 0402 package. I've done everything I could i.e. Profile, placement, 10 Deg placement, stencil design, but still this culprit exist. One things for sure is taht I have a very bad pad size for 0402 ( 25 mil
Electronics Forum | Thu Nov 04 19:04:49 EDT 2010 | eadthem
It would depend on the solder paste but the stuff we use is heavy enough that it wont go airborne. and theres really no other way to clean the apertures on a 0402 or similar part.
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