Electronics Forum | Thu Aug 07 01:23:43 EDT 2003 | craigj
Does anyone out there have any info on track balance ratios. i.e. heavy track entering 1 end of component (0402) and thinner track leaving other end and how this effects/causes problems like tombstoning. Am trying to put together design rules for cus
Electronics Forum | Sat Apr 21 21:02:30 EDT 2007 | mika
Yes we can (at least show something that work for us) but hey, not possible to attach some pictures here... We don't have any problem with 0402:s on OK Corral... / Ps. Just get up mischief. Ds.
Electronics Forum | Tue Apr 01 13:17:49 EST 2003 | cyber_wolf
The problem is that there are also SOT23's present. I would use a .004 or a .005 stencil, but I don't think that the dots are going to contact the bottom of the larger packages on a thinner stencil. ...Thanks for the input.
Electronics Forum | Thu Jun 02 14:50:41 EDT 2005 | techknow..
Placement looks good...paste to pad coverage good..correct profile used and verified by tracker. The problem being that this one cap is tombstoning at the same place every time. The placement is central. The part is near the edge at the break off.
Electronics Forum | Fri Oct 31 12:54:26 EST 2003 | stefwitt
Absolutely, 0402�s are no problem and should not require any special modifications. However, you will find, that not all 0402�s are the same. I have users, who created 5 different GF-packages with different dimensions and light contrast. With small
Electronics Forum | Fri Mar 09 08:25:13 EST 2001 | CAL
We have seen some problems with component end cap solder terminations not being symetrical. i.e. If one end on the cap has a larger solder ternination this sometimes is enough surface area during reflow to lift the opposite side of the component. We
Electronics Forum | Wed Jan 07 07:50:24 EST 2009 | ludee_circuits
I think so. My customer once assembled resistors 0402 ,by Glue+wave soldering process. But PCB must be printed soldermask bridge between 0402 SMD PADs, otherwise you would encounter short problem. Sorry I don't have any comment for recommended footp
Electronics Forum | Tue Dec 26 11:26:00 EST 2000 | acahill
If you have a known problem with the parts, then Reject them back to the Vendor. It appears that you have a solderability issue. As for Tombstoning on 0402 chips, this could trace back to the stencil design and/or machine placement. Define Tombstoni
Electronics Forum | Thu Mar 08 16:02:58 EST 2001 | arturoflores
You did not mention to change the solder paste to another formulation or brand.We used to have that kind of non wetting problem on 0402 cap when we used Alpha's LR737(63/37) Type 4 No Clean and the solution was to change the solder paste to Alpha's L
Electronics Forum | Fri Oct 02 11:59:37 EDT 1998 | jon Medernach
| I am experiencing solder paste comtaminatin of nozzels on 0603 size components resulting in missing components. The machine is failing to alarm under these circumstances. Has anybody else experienced this problem & found a solution? | Just a sugge
