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March 2012

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Subject:
Re: IPC APEX Designer's Day
From:
[log in to unmask]
Reply To:
(Designers Council Forum)
Date:
Mon, 19 Mar 2012 18:43:20 -0400
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text/plain (106 lines) 
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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