Custom part MFRC522 or (vf)qfn-32?

parts help
1

hello,

does anyone know if there is a fritzing part for the MFRC522 or any (vf)qfn-32? or is there anyone willing to make it for me? or is there a (paid) service that will make custom parts?

thanks
frank

2

Who makes the chip you want? The NXP mdrc522 data sheet doesn’t have a recommended pcb footprint (only the package outline), the TI version has a footprint but isn’t a MFRC522 … It matters because the TI version (and maybe the NXP) want thermal pads on the footprint. There is a gfn-32 footprint in core parts, but it doesn’t have thermal pads and thus probably isn’t suitable.

Peter

Peter

3

hi peter,

i want to use the nxp: https://media.digikey.com/pdf/Data%20Sheets/NXP%20PDFs/MFRC522.pdf

the footprint: https://www.nxp.com/docs/en/package-information/SOT617-24.pdf

seems no thermal pad

what is the gfn-32 part? searching on gfn-32 does not find anything

thanks
frank

4

It is the atmega 168 SMD part. Found in

Fritzing\fritzing-parts\svg\core\pcb\SMD_LQFP32_DT.svg

then the part identified by a

fritzing/fritzing-parts/core
$ grep -R SMD_LQFP32_DT.svg *
SMD_atmega168.fzp:

but the footprint doesn’t look correct for the nxp part I found, I’ll have a look at the one you posted.

edit: Yes that footprint is the one I was looking at, and it does want thermal pads that are not in the listed footprint. I’ll modify a part.

Peter

5

This part should do what you want. As always before ordering boards print out the footprint at 1:1 scale and check it against a real part. In order to get DRC to pass you need to set the keepout down to 0.0050in.

MFRC522.fzpz (11.4 KB)

Peter

6

wow, that is great! thanks peter!

is there a place we can put these so it is easy to find for other to use? or is that this forum?

i am going to use it now!

cheers
frank

7

That is usually the forum. If I get unlazy it is possible to make a pull request on github and get it added to core parts, but I usually leave them in the forum.

Peter

8

https://github.com/sumotoy/MFRC522/blob/master/doc/fritzing/RFID-RC522-v2.fzpz ?

9

if you look at the image (https://github.com/sumotoy/MFRC522/blob/master/doc/fritzing/RFID-RC522-v2.png) - this is a board with the chip, not the chip itself

thanks