Toe, Heel and Side size in PCB library expert and Altium Designer

[jtronix]

When i was creating a footprint i found that footprint create from PCB library expert and Altium IPC Complaint Footprint Wizard does not match. if both follows the same standard then it should give the same result.

After that i have investigate the issue and i found that in Altium designer Toe, Heel and Side comes different than PCB library expert.

I have shared the complete list of Toe, Heel and Side size with different densities.

Can any one please confirm that the size mention in the pdf file is correct or not?

PDF Link: https://www.pcblibraries.com/Products/FPX/UserGuide/download/Library%20Expert%20Surface%20Mount%20Families.pdf

[T3sl4co1l]

Look up IPC-7351B.  Likely you will find that both are wrong in various places.

If you aren't inspecting footprints before use, or consulting with your assemblers on what they prefer, it's your own problem.

Tim

[jtronix]

I don't have IPC7351B.

Will you please share QFP package sizes if you have?

[D3f1ant]

Remember IPC 'rules' are a guide. Nobody said they are perfect. Any value between the highest and lowest density will work fine...the larger you make it, the easier it is to get a good result. If you want to second guess the IPC rules, you can always use the datasheet for the particular device your working with and follow it's recommendation.
 For prototypes anything will work, for volume production, if you find a consistent problem with a particular footprint, it can be tweaked slightly for the next batch.