While manufacturer's may have very small deviations in their footprints, by and large almost every IC conforms to some kind of JEDEC compliant package. From the

While manufacturer's may have very small deviations in their footprints, by and large almost every IC conforms to some kind of JEDEC compliant package. From there, IPC-7351B [1] has mathematical recommendations on footprints ranging from Class 1 (minimum required) to Class 3 A/B (ultra-reliable). Obviously those are just suggestions, but manufacturers have been aligning more and more with them. My daily ECAD/EDA tool is Altium, and I can't remember I had to manually make an IC footprint. I use their IPC Wizard[2] to make it all for me. As a bonus, I get a nice STEP model too with my export. [1]: Can find it here http://shop.ipc.org/IPC-7351B-English-D http://shop.ipc.org/IPC-7351B-English-D or likely in PDF elsewhere. [2]: https://www.altium.com/solution/pcb-footprint-library https://www.altium.com/solution/pcb-footprint-library