Hello,

the document is:

IEC 61188-7, Ed.1: Electronic Component Zero Orientation for CAD Library 
Construction

as the US (Level A) and the European/Japanese People (Level B) had different opinions 
about zero orientation it has two options for zero orientation:

Level A Basic Rules
For level A type component descriptions for multiple leaded parts pin one shall be 
left oriented per the basic rules however, pin one shall be located at the upper or 
upper-left position.
Level B Basic Rules
For level B type component descriptions for multiple leaded parts pin one shall be 
left oriented per the basic rules however, pin one shall be located at the left or 
lower-left position.

Hope this helps

Best Regards

Rainer Taube
Master IPC Trainer (IPC-A-610)

TAUBE ELECTRONIC GmbH
Nostitzstraße 30
10965 Berlin
Tel.: ++49 (0)30 69592511
Fax: ++49 (0)30 6942338
e-mail: [log in to unmask]
http://www.taube-electronic.de

Geschäftsführer/CEO: Rainer Taube
Amtsgericht/Trade Register: Berlin HRB 95715 B
USt.-ID/VAT: DE 814229848

Am 5 Aug 2011 um 10:39 hat S. Roy geschrieben:

> Good morning,
> 
> I recall there being a document about building PCB footprints with
> zero orientation, pin 1 being down in the lower-left corner, etc.  Can
> anyone supply me with the name of that document?  And who put it out
> there?  Is anybody still using this standard?  Thanks...
> 
> Respectfully,
> 
> Steven D. Roy
> PCB Designer, CID
> Audio Authority Corporation
> 2048 Mercer Road
> Lexington, KY  40511
> (859) 233-4599
> [log in to unmask]
> 
> 
> 
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