I'm here!

geez, I take ONE DAY OFF from my gmail and look what happens...!

Well, The IPC Terms and Definitions Committee is always trying to clarify
terms, which is especially important as these documents travel around the
world, more and more people are starting to become familiar with our little
corner of the universe (and moving forward, I am one of those who would
side with accuracy over tradition).

Of course, you and me and everyone we know probably "grew up" calling the
Land Pattern the "Footprint", but it is important to know the actual
dimensional information of the component that touches the surface of the
board. In the past, many CAD systems (and supporting documentation) have
"component outline" filling this role, but the component outline does not
always correspond with the metallization are that we are trying to solder
to.

so... It seemed convenient (and accurate, by the way) to use the term
"footprint" to describe the actual component soldering area.

Think of it this way: If you are at the beach and you press your bare foot
into the wet sand, the imprint it will leave is your FOOTPRINT. Your SHOES
will be a different size altogether, and in fact you may have many
different sizes of shoes for different applications. I would be willing to
bet that the dimensions of your hiking boots will be a different size than
the dimensions of your flip-flops.

In the same way: If you press any component into wet sand, the imprint it
will leave will be its footprint, although there are several different
sizes of land patterns that will be appropriate for different applications,
right? But regardless of which land pattern we use, we still want to know
the dimensions (and tolerance) of the actual footprint. We never want to
lose that, no matter what fancy land pattern ideas we are experimenting
with (home plates? roundeds? etc).

kinda makes sense, but now all we have to overcome is all the old folks
like us who call land patterns "footprints"

but I vote NO.
DO NOT change the title of the LAND PATTERN standard!

onward thru the fog,
Jack

.

On Mon, Mar 19, 2012 at 6:48 PM, Tom Hausherr <[log in to unmask]
> wrote:

> Cherie,
>
> Now we're exposing terms & definitions issues. I noticed you used the term
> "Footprint" when describing your PCB library parts, but IPC never uses that
> term. The IPC-7351 is the "Land Pattern" standard, not the Footprint
> Standard. However, everywhere I go EE engineers and PCB designers refer to
> there library parts as Footprints.
>
> Should IPC change the name of the standard to - IPC-7351C Footprint
> Standard?
>
> Does anyone on this forum refer to their PCB library parts in an everyday
> conversation with co-workers as "Land Patterns"? Or does everyone use the
> term Footprints?
>
> Example 1: if you created a calculator for library part creation, would you
> call it "The Footprint Calculator"?
>
> Example 2: do component manufacturer's use "Recommended Footprint"? or Land
> Pattern? or both?
>
> Example 3: does any CAE/CAD Vendor refer to PCB library parts as Land
> Patterns in their software?
>
> I've got issues today... Where's Jack Olson on this?
>
> Tom
>
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
> [log in to unmask]
> Sent: Monday, March 19, 2012 3:43 PM
> To: [log in to unmask]
> Subject: Re: [DC] IPC APEX Designer's Day
>
> Yes, this part is interesting.  I'm a big proponent for working in  metric
> for the same reasons that others have expressed here.
>
> As Andy pointed out, many Americans have difficulty learning a new
> language.
> And for us, that's what it is.  I've found  that being able to think in
> both
> systems is one of the first  steps.
>
> As I've been creating and maintaining an Altium component  database for a
> company, the issue of metric vs inch is discussed from  time to time.  A
> good compromise has been to keep the footprint names in  agreement with the
> IPC Metric base: "RESC2012X40N"; and put the "generic"  inch based
> reference
> at the end of the description line: "Res 1.78K 1/8W 1%  0805".  It makes
> for
> easy identification and gets everyone used to both  names for the part.
>
> Cherie
>
>
> In a message dated 3/19/2012 3:21:03 P.M. Pacific Daylight Time,
> [log in to unmask] writes:
>
> Irina  & All,
>
> What do you call your chip resistors and  capacitors?
>
> EIA Inch Based - 1206, 0805, 0603, 0402 or IPC  Metric Based - 3216, 2012,
> 1608, 1005
>
> This is where it gets  interesting....
>
> Tom
>
>
> -----Original Message-----
> From:  DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
>  Irina
> Leushina
> Sent: Monday, March 19, 2012 2:46 PM
> To:  [log in to unmask]
> Subject: Re: [DC] IPC APEX Designer's  Day
>
> Yeah, there is sort of busy game out here...
> I'm playing mils  with fab houses, mm with assembly/pnp vendors, making lib
> patterns depends  how the component represents from manufacturer...
>
> Personally and  professionally I would prefer the universal measurement
> everywhere on the  field.
>
> Regards,
> Irina Leushina
> STS-USA
> Milpitas,  CA
>
>
>
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