Added DFN-8-1EP_2x2mm_P0.5mm_EP0.7x1.3mm.

[cnieves1]

Generated using script, PR at: easyw/kicad-3d-models-in-freecad#325

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• A screenshot of the model(s) aligned with KiCad footprints is very useful
• Was the 3D model(s) created in a mechanical modelling program?
• Source files (or scripts) have been contributed
• Step model submitted in 1:1 scale
• WRL model submitted in 1:2.54 scale
• 3D model alignment checked against KiCad footprint
• WRL model uses correct material properties
• Geometry check performed against mechanical models

[Misca1234]

Hi

Thanks for you contribution

Why have you named the 3D model to DFN-8-1EP_2x2mm_P0.5mm_EP0.7x1.3mm
when, according to data sheet https://www.onsemi.com/pub/Collateral/NUF4401MN-D.PDF
the EP is 1.4x0.75 mm ?
and in the paramterfile you have set
epad = (1.2,0.6), # e Pad #epad = None, # e Pad

You have also set
ps = 'rounded', # rounded pads
when they should be rectangle

The datasheet link should be changed from
'': Params( # from https://www.onsemi.com/pub/Collateral/506AQ.PDF

' Params( # from https://www.onsemi.com/pub/Collateral/NUF4401MN-D.PDF

[cnieves1]

Sorry, I'm afraid I need further clarification....

I don't understand why you are saying the EP is 0.75x1.4mm.
The EP is D2*E2 = 0.5:0.7-1.1:1.3mm, where nominal size is 0.6x1.2mm. See below:

If I get these values into:
pointhi/kicad-footprint-generator#452
Then the EP in the footprint I get is 0.7x1.3mm, and the 3D model should be named like that.

So, regarding naming:

• Real package EP nominal size is 0.6x1.2mm
• Footprint EP size is 0.7x1.3mm. Footprint name matches the footprint's EP size.
• 3D package size: physical EP is again 0.6x1.2mm. Should 3D name match the footprint name or the real package EP size?

It the name is DFN-8-1EP_2x2mm_P0.5mm_EP0.6x1.2mm, then it would match the phyisical EP size, but it wouldn't match the footprint name.

The script https://github.com/easyw/cadquery/FCAD_script_generator/QFN_packages/cq_parameters.py has the option modelName, so in theory, we could have a DFN-8-1EP_2x2mm_P0.5mm_EP0.7x1.3mm footprint pointing to a DFN-8-1EP_2x2mm_P0.5mm_EP0.6x1.2mm 3D model file.
However, I can't found any match like this in that file.
So, what is the policy here?

Regarding datasheet link: again there is a mixed world in the script. Some links to a specific part name with a specific function while others link to a generic package drawing link.
As the package drawing, generally speaking, has nothing to do with its function or a specific part number, I understood the generic policy was link to a package drawing unless there is none available. Again, could you clarify the policy?

I agree on setting ps='rectangle' instead of ps='round'.

Thanks,

[cnieves1]

When posting, I have just saw why you were talking about EP size 0.75x1.4mm...

It is the landpattern recommended EP size given by the manufacturer. However, your script at:
https://github.com/easyw/kicad-3d-models-in-freecad/pull/325/files
does not use recommended land pattern, but it calculates its size using minimum and maximum physical EP size.

Therefore, I can not use 0.75x1.4mm EP size.

This PR is about 3D model, which should follow the package dimensions, not the recommended land pattern....
So, please clarify the naming and datasheet link policy as requested by the above comment.

Thanks,

[cnieves1]

Again another issue: it seems both rectangle and round terminals are used:

The 3D generator uses the round terminal model, so ps='round' is correct.

[chschlue]

Thanks.