Reason of measurements of Cap 1812 footprint

[CataM]

Hello everyone,

Here is a 1812 (4532 metric) SMD Cap: https://www.digikey.es/products/es?keywords=445-1607-1-ND

If one goes to the footprint provided by UltraLibrarian as follows: DigiKey link --> Download from UltraLibrarian --> Detailed view in the Footprint, we see the following:



Pointed with the arrow shows that half of the pad=0.203mm

According to IPC-7531, the pad should be 1.6mm (maximum) or 1.2mm (minimum).

Can anyone provide me the reason why UltraLibrarian is using a lot less of pad width ? Are they mistaken ?

 

[andre_luis]

Are you sure you have attached the correct snapshot ?
The picture is from an IC, but the link refers to an SMD capacitor.

 

[CataM]

Yes, I have attached DigiKey link and instructions to get to that information. You can check it. It is correct and very weird !

 

[andre_luis]

Ops, my fault, you are correct.
There is a big error in the size.

 

[CataM]

There is a big error in the size.

O.K. So it is an error.

I don't want to provide the altium files because you would say I have corrupted the file. I want you you guys to check it.

Here is step by step:
From DigiKey link --> Click on "Download from UltraLibrarian" --> follow this video

What you get in Altium footprint is exactly what you see on the "Detailed view" on the Footprint from UltraLibrarian, like here:

 

[andre_luis]

It is not clear by whom the models available on the Ultralibrarian are made (is it from colaborative repository among manufacturers? are made by Digikey staff itself?). So far I have had no problems with even more complex ICs, but maybe it is time to review the feasibility of this site as a trustable source of footprint models.

- - - Updated - - -

BTW, I have used this site to get my Altium models, even reaching the monthly quote.
I've used exactly the same process described in the video.

 

[senilicus]

It has been stated on several occasions, get familiar with IPC-7351.

I am a professional PCB designer for over 30 years now and i never download footprints from the internet. Learn the IPC-7351 standard and create your footprints
accordingly. I know it is tempting to download them and may be OK for hobby projects, but thats it. (imho)

 

[CataM]

Learn the IPC-7351 standard and create your footprints
accordingly.

I am downloading the footprints for the 3D model, not the 2D.
How do you make 3D model for this caps ? Or you do not need 3D models either ?

 

[senilicus]

We use Library Expert for our footprints. It will also generate a 3D model. (if you have the license)