Gary,
This is a very common problem,
As far as I understand pin 1 is cathode, however some manufacturers have 
Pin 1 as anode, and to make matters worse, the same manufacturer will 
have pin1 as anode for one device and pin1 a cathode for a different device.
What I do is to make all foot-print for diodes having pin 1 as cathode 
where the marking is, and tell all engineers to always use this rule, 
regardless of the data sheet, any way we also revised data  sheets 
indicating pin 1 as cathode.
It is better for this to be ironed out by the designated librarian and 
component engineer, and make this as a rule.

-Patrick

Gary Bremer wrote:
> Hi,
> I have been asked if there is a standard for creation of footprints 
> espicially for diodes. One of the designers reversed the cathode and 
> anode causing all the diodes to be placed backwards. The rational was 
> the pin 1 was the anode for this device for other diodes pin 1 is the 
> cathode.
>
>
> Gary Bremer CID
> Manufacturing Engineer
>
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-- 
Patrick Jabbaz
Ubiquiti Networks
495-499 Montague Expwy
Milpitas, CA 95035
T: (408) 942-3085
M: (408) 621-6533 

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