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Find IC footprint

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alamwte:
Hello,

I have a question.
What is the true way of finding a PCB footprint of ICs?
 For example I can not find the IC's footprint by its part number. But I know it is a QFN 56 7x7 .
How can I find the standard dimension of these packages to build its footprint by my own?
I have found many dimension for this package!!
I even found different footprint in Snapeda.com

please guide me,
Thanks ,

Pseudobyte:
If the manufacturer doesn't include the footprint information in the datasheet, they usually include at least the internal package name/drawing number. When you go to the manufacturer's website or do a careful web search you should be able to find the drawing of the footprint.

As you have discovered there are many QFN56 7x7 packages. If there is a drawing of the geometry of the physical part, QFN's are easy to make footprints for from scratch.

alamwte:
In its  manufacture's site is just written its package is QFN56 7x7.

Now I want to find out where can I find its dimension ?
Is there any site that I can find the QFN packages standards?

I have found some different dimension of this package in every site. for example in nxp.com and ti.com or FTDI.com it has different dimension.

Thanks,
 

thm_w:

--- Quote from: alamwte on October 22, 2021, 04:54:24 pm ---I have found some different dimension of this package in every site. for example in nxp.com and ti.com or FTDI.com it has different dimension.

--- End quote ---

Yeah but is it close enough that it would work, thats all that matters.

alamwte:
OK, thanks

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