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Hello Dear Members, i have to make pcb package of PVQFN package, i have the mechanical data of the footprint but there are 2 reading for each measurement i need to know which one is correct ? kindly guide me thanks.
Firstly look at and learn about IPC7351, secondly look for and learn about dimension basics, I would consider this a basic requirement for any one involved with any form of mechanical design process....
And yes PCB design is a mechanical design process, with tolerances base dimensions etc.