Since we're creating a representation of a real component to be used
within a computerized environment,
Why not call it a "VC" ... a virtual component.
Or is that too far out there ... ;>)
Andre Demers CID+
CMRSummit Technologies Inc.
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
Kevin Seaman
Sent: Tuesday, March 20, 2012 10:04 AM
To: [log in to unmask]
Subject: Re: [DC] IPC APEX Designer's Day
My personal preference is "Footprint". I've built too many library parts
that had absolutely no PATTERN to the pins at all. Particularly bump pad
devices.
Kevin L. Seaman, C.I.D.
Principal PCB Layout Engineer
Valor Team
PCB Library Support
Broadcom Corp. Irvine, CA
(949) 926-5656 (ext. 65656)
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack
Olson
Sent: Tuesday, March 20, 2012 6:52 AM
To: [log in to unmask]
Subject: Re: [DC] IPC APEX Designer's Day
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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