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March 2012

DesignerCouncil@IPC.ORG

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Subject:
From:
Robert Wolfe <[log in to unmask]>
Reply To:
(Designers Council Forum)
Date:
Tue, 20 Mar 2012 09:50:30 -0400
Content-Type:
text/plain
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text/plain (201 lines)
Tom,
Well I wouldn't say we could make such a general statement.

I think everyone really gets used to calling them what their particular CAD
System calls them, and they are all different. Problem is when you call up for support one generally start to adopt the terminology of the system one is using
over time.
Hey I'm finally comfortable with the term Decal. (even though I've done my share of hand taping back in the day).

PADS is Decal
Expedition is Cell
Altium is Footprint
Allegro is Symbol
etc
They are all different, so IPC could logically pick any of the above, I really don't see each CAD company changing their terms to one standard name any time soon.
But stranger things have happened.

Bob Wolfe



-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Tom Hausherr
Sent: Monday, March 19, 2012 7:49 PM
To: [log in to unmask]
Subject: Re: [DC] IPC APEX Designer's Day

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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