The closest thing I can think of, not being a MCU Id though, it's a memory
with a unique ID. You can buy from Microchip the EEPROMs with MAC ADDRESS
(www.microchip.com/mac) with volume pricing as low as $0.21.

Additionally, and thinking outside the box, if you need to validate an MCU
ID you can do something like saving an ID on the FLASH and also saving a
hash, generated using the program memory and ID, so if that number is
modified by someone else, the hash and serials would not verify. You should
think how to get these numbers without giving user access to them, so no one
can copy all the numbers to another MCU...

Regards
Mauricio Jancic

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
> Behalf Of Funny NYPD
> Sent: Tuesday, September 29, 2009 08:40
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE]MCU with unique read-only ID?
> 
> The unique read-only ID can be used for many functions. For instance,
> it can be used to identify each MCU, each individual products, etc.
> 
>  Funny N.
> Au Group Electronics, http://www.AuElectronics.com
> http://www.AuElectronics.com/products
> http://augroups.blogspot.com/
> 
> 
> 
> 
> ________________________________
> From: Vitaliy <piclist@maksimov.org>
> To: Microcontroller discussion list - Public. <piclist@mit.edu>
> Sent: Monday, September 28, 2009 10:09:58 PM
> Subject: Re: [EE]MCU with unique read-only ID?
> 
> Funny NYPD wrote:
> > Is there such a MCU product exist on the market, which has a unique
> > read-only ID on each chip? Most of today's Flash based MCU can be
> > assigned/programed with a unique ID, but this ID can be erased at
> chip
> > erase, it can also be copied.
> >
> > Currently we only found there are some standalone read-only "ID chip"
> > available from different vendors, I just want to make sure if there
> are
> > some MCU get this kind of ID feature.
> >
> > P.s. We have double check with Microchip MCUs, and confirmed none of
> the
> > PIC got this feature yet. I am curious if other brand of MCU has this
> > feature? E.g. a 12F508 equipped with such an ID can be identified
> from any
> > other 12F508s even though they are made on the same day, same lot,
> even
> > same die.
> >
> 
> Why do you need this functionality?
> 
> Vitaliy
> 
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