I have a part with no vendor recommended footprint. It's called VSOP30 pin pitch = 0.22mm +/- 0.1 center-to-center = 0.65mm outside-to-outside width = 7.6mm +/- 0.2mm pin size is 0.45mm +/- 0.2mm
Here's the data sheet, see pg 30. data sheet: http://www.asahi-kasei.co.jp/akm/en/product/ak4390/ak4390_f03e.pdf I don't know how to size the pads correctly. Do the tolerances work as worst-case of one follows with the worst case of another - that is, if one spec is off to +max, then all tolerances will be off to the + max? Or is it mix and match, +max of this and -max(min) of that? How much pad do you need on the outside of the pin, and how much on the inside assuming hand soldering? I came up with this: pad length = 2.1mm outside-to-outside = 9.8mm inside-to-inside = 5.6mm Is that reasonable? The pads look long to me. _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
