Re: gEDA-user: Footprint for an SMT chip resistor array

[joeft <joeft@xxxxxxxxxxxxx>]

DJ Delorie wrote:

> > We've used the EXB-28V series on several boards.  With some feedback 
> > from one of our board stuffers the footprint solders very repeatably.  
> >    
>
> What was the feedback, if we may ask?
>
>
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>  
As I recall, it involved
(1) Increasing the size of the 4 corner pads.  The Panasonic data sheet 
doesn't do a good job of describing the optimal land pattern.  The end 
pads are really quite a bit larger than the middle pads.
(2) Modifying the solder resist to prevent any thin slivers from showing 
up between the pads.
(3) Sightly reducing the amount of paste on the pads.  I didn't do much 
with this since the bloat/shrink for the paste pattern relative to the 
mask opening seems to be global and I didn't want to mess up any of the 
other small parts on the board.

Obviously these tweaks are relative to the pad design I started with 
(don't remember where it came from).  It has silkscreen under it for 
polarity indication which you might want to remove.

The last board I put this footprint on came out looking very nice.

Joe T


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