Great link Jack!
One thing that tends to be forgotten at design level is the insertion machines are programmed from the CAD output, so using whatever zero was set by the designer. But the zero for the insertion machine is actually the polarity of the part in the tape, as supplied by the part manufacturer. So ideally the zero in the design would be identical with the zero of the taped component. And the parts manufacturers seem to stick with the EIA-481 standard, which makes more sense, because it says caps (therefore mark on the +) have the marking on the opposite side from diodes (mark on the - side).
Complicated, isn't it? What I am trying to say is, if you are an OEM, work with your assembly people.
Regards,
Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask]
W | www.digico.cc
N'imprimer que si nécessaire - Print only if you must
-----Message d'origine-----
De : Jack Olson [mailto:[log in to unmask]]
Envoyé : August-05-11 1:04 PM
À : [log in to unmask]
Objet : Re: [DC] IPC - 7351B Land patterns...
Yes, that is the other one.
You can see a chart comparing them HERE:
http://www.frontdoor.biz/HowToPCB/HowToPCB-images/component-orientation.png
(I got that from Tom Hausherr)
The big question in my mind is:
"Why didn't IPC follow BOTH documents, at least where they MATCH???
(maybe I should CC: him on that question...)
surfin' the learnin' curve,
Jack
.
On Fri, Aug 5, 2011 at 11:42 AM, Rainer Taube
<[log in to unmask]>wrote:
> 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]
> >
> >
> -=-=-=-
>
> I'm pretty sure the document you are thinking of is *EIA-481D.*
> but I don't believe it is keeping up with all the new package styles coming
> out now.
> My advice would be to follow whatever Tom Hausherr is doing with the
> software he maintains
> (and if you don't have the IPC-7351 land pattern calculator/viewer
> software, get it!)
>
> here's a link that will lead to more info, check it out:
> http://blogs.mentor.com/tom-hausherr/blog/tag/iec-standards/
>
> Most older companies have libraries with rotations that aren't consistent,
> but my hope is that eventually we will reach a consensus (at least with
> newer libraries)
> that everyone can depend on.
>
> onward thru the fog,
> Jack
>
> .
>
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 16.0.
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 16.0.
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------
|
