Wow Tom, you know, it never struck me that way. To me they're synonymous.
I just think of them as footprints and if you call it a Land Pattern, I
still think "footprint".
Many of the assembly people I talk with refer to the land pattern as a
footprint. And I've seen data sheets refer to them both ways. Sometimes in
the same data sheet.
Most of the early CAE/CAD programs referred to a footprint and I think
that's what stuck with all us. In Altium, the calculator is still a
"Footprint Wizard". In PADS, they're called "Footprints". Don't know about some of
the others, but I'll bet they're mostly called "Footprints".
Is there a distinction between "Footprint" and "Land Pattern"?
Cherie
In a message dated 3/19/2012 4:49:11 P.M. Pacific Daylight Time,
[log in to unmask] writes:
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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