kicad-developers team mailing list archive

[Alex G <mr.nuke.me@xxxxxxxxx>]

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>> Is it just me or are DFN8-M065 <-> TDFN8-M065 and DFN10-M05 <->
>> TDFN10-M05 packages identical except that TDFN's have slightly larger
>> pads?
> 
> Very likely - my DFN/QFN lib is based on datasheets
> from topline.to (they make dummy components).
> 
> I've seen several variations in identical packages, when
> comparing datasheets from different manufacturers, so
> appropriate values must in some cases be guesstimated :-(
> 
For 3D packages, it's not that critical. For footprints, I would go with
the more conservative values, such as the larger pads.

I like maxim's documentation because it's complete, and quite
conservative, and the components they make seem to always conform to
specs, unline some other manufacturers.

> In some cases, I've even resorted to measuring on actual
> components that I happen to have laying around ...
>
Ouch! You need a pretty good caliper to measure something that small.

> Also, some datasheets specifies min+max, and others only
> the nominal size - I've chosen nominal (almost ?) everywhere.
Nominal is fine, IMO. Nominal is a manufacturer's way of saying "it's
how it should look, but we can't get it that exact".

Alex

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