IPC long has decided upon "land" as "a portion of a conductive pattern
usually, but not exclusively, used for the connection and/or attachment of
components."
Likewise, "land pattern" describes "a combination of lands that is used
for the mounting, interconnection and testing of a particular component."
(These are per IPC-T-50, the Terms and Definitions standard.)
The way IPC develops a standard is, a group will come together for the
purposes of writing a standard. IPC coordinates the effort. The task group
develops a draft, then circulates that draft to anyone in the IPC
membership who wants to review it. Those originating task group then
reviews and dispositions the membership's comments, makes any additional
edits needs, and circulates the final draft (called an Interim Final) for
a task group vote.
As I see it, it's really up to the CAD companies to participate in the
standards development process and accept/adopt the decisions. To pursue
their own "language" is unnecessarily confusing and non-value-added.
Best,
Mike
Mike Buetow
PCD&F/Circuits Assembly
w/m: 617-327-4702
@mikebuetow
PCB CHAT: A new way to engage the experts: www.pcbchat.com
The 2012 CIRCUITS ASSEMBLY Directory of EMS Companies:
circuitsassembly.com/dems
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Robert
Wolfe
Sent: Tuesday, March 20, 2012 9:51 AM
To: [log in to unmask]
Subject: Re: [DC] IPC APEX Designer's Day
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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