kicad-developers team mailing list archive

[Rene Pöschl <poeschlr@xxxxxxxxx>]

There are completely new footprints for such devices. (In the v5 lib)

I think the resistor lib should even be compatible with kicad 4 (it has 
no part with complex pads in it). At least the footprint in question is 
compatible.

They are now script generated [1]. The dimensions for the pads are based 
on IPC recommendations.

The dimensions for the resistors come from different datasheets. (The 
respective datasheet is always listed in the description of the footprint)


[1] 
https://github.com/pointhi/kicad-footprint-generator/tree/master/scripts/SMD_chip_package_rlc-etc



On 04/04/18 02:00, hauptmech wrote:
> You should be able to check the footprint just by looking at it in a
> text editor or online. That will be faster than compiling Kicad.
>
> https://github.com/KiCad/Resistors_SMD.pretty/blob/master/R_2512_HandSoldering.kicad_mod
> https://github.com/KiCad/kicad-footprints/blob/master/Resistor_SMD.pretty/R_2512_6332Metric_Pad1.34x3.40mm_HandSolder.kicad_mod
>
>
> On 4/04/18 09:56, Augusto Fraga Giachero wrote:
> > Sorry for the noise, I'll try to compile the Kicad 5 rc2 and check if
> > this issue persists in the new library.
> >
> > Thanks,
> > Augusto Fraga Giachero.
> >
> > Nick Østergaard writes:
> >
> > > The kicad-developers list is not really for detailed library discussions
> > > like this. You may have better luck reporting the issue directly on
> > > https://github.com/kicad/kicad-footprints/issues
> > >
> > > I am not sure what the plan is, but I don't think the Librarians will
> > > update the old footprints, all activity are done in the new repos.
> > >
> > > http://kicad-pcb.org/post/kicad-official-libraries/
> > >
> > > 2018-04-03 23:33 GMT+02:00 Augusto Fraga Giachero <augustofg96@xxxxxxxxx>:
> > >
> > > > Hi!
> > > >
> > > > I've had a an unpleasant surprise with a 2512 (imperial) smd resistor
> > > > footprint (Resistors_SMD:R_2512_HandSoldering) available in the Kicad's
> > > > official library (shame on me for not checking the dimensions before
> > > > sending the gerbers). When our boards arrived we verified that the pads
> > > > of this footprint are too further apart, up to the point that the
> > > > resistor barely touches the pads.
> > > >
> > > > I've looked on some datasheets and other sources and confirmed that this
> > > > footprint is out of the recommended dimensions
> > > > (http://www.resistorguide.com/resistor-sizes-and-packages/).
> > > >
> > > > I've attached an image showing the dimensions from the website
> > > > above. The recommended dimensions for 2512 are a = 3.5mm, b = 1.6mm and
> > > > c = 3.8mm, while in the footprint available on Kicad a = 3.2mm, b =
> > > > 2.7mm (no problems with this been wider as it is a hand soldering
> > > > variant) and c = 5.2mm.
> > > >
> > > > Dim(mm) Average     Kicad
> > > > a       3.5         3.2
> > > > b       1.6         2.7 (ok, hand soldering)
> > > > c       3.8         5.2 (too further apart)
> > > >
> > > > I don't known if it is fixed in the new Kicad 5 libraries, but it would
> > > > be nice to be fixed in the legacy libraries as well. I can make the fix
> > > > if nobody have already made.
> > > >
> > > > Thanks,
> > > > Augusto Fraga Giachero.
> > > >
> > > >
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