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Subject: Re: [geda-user] pcb-rnd: parametric footprints (status update)
From: John Doty <jpd AT noqsi DOT com>
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Date: Sun, 19 Jul 2015 12:40:37 -0600
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On Jul 19, 2015, at 9:57 AM, Yvette S. Hirth, CCP, CDP (yvette AT dbtgroup DOT com) [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:

> On 07/19/2015 08:31 AM, John Doty wrote:
> 
> (snippage)
>> We have a standard for footprint naming that applies to more than 95% of components:
>> http://wiki.geda-project.org/geda:pcb_footprint_naming_conventions.
> 
>> That’s the place to start. I think these are what belong in library components.
> (snippage)
> 
> hrm.  i note that there are dups in the "standard for footprint naming":
> 
> > Dual in line packages with up to 22 100 mil spaced pins and 300 mil
>  row spacing are called DIPn.
> > Dual in line packages with 24 or more 100 mil spaced pins and 300 mil
>  row spacing are called DIPnN.
> > Dual in line packages with 100 mil spaced pins and 400 mil row
>  spacing are called DIPnH.
> > Dual in line packages with 24 or more 100 mil spaced pins and 600 mil
>  row spacing are called DIPn.
> > Shrink dual in line packages with up to 24 70 mil spaced pins and 300
>  mil row spacing are called SDIPn.
> > Shrink dual in line packages with more than 24 70 mil spaced pins and
>  400 mil row spacing are called SDIPn.
> 
> so "DIPn" refers to inline packages that have both 300mil row spacing

Only if they have less than 24 pins.

> and 600mil row spacing,

Only if they have more than 22 pins.

> and "SDIPn" refers to inline packages with 300mil row spacing

Only if they have less than 26 pins.

> and 400mil row spacing.

Only if they have more than 24 pins.

> 
> shouldn't they (diff DIP packages with diff row spacing) be unique?

They are unique, just not in the way you expect. It’s a minor short cut, based, I suppose, on the idea that the longer DIP packages tend to be wider. Make those DIPn, make the exceptions DIPnN. I wouldn’t have done it that way, but it’s what we’ve had for years, and it’s not terrible.

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com