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Good day,

Microchip did not have the 3D CAD step file for the DSPIC33CH128MP503-I/M5 (uqfn-36, 0.4mm pitch) package. They do have the footprint and component files. I used FreeCAD to make the 3D package I needed.  Free to download and use as you wish, happy if you give credit to my blog.

Zipped File: UQFN36_5x5x0.4_MCH.step

Enjoy!