PIC
>> 2x3(x1) mm DFN,

AVR
> ATtiny4/5/9/10 data sheet here
> http://www.atmel.com/dyn/resources/prod_documents/doc8127.pdf

My 'chip enabled' VISA card is about 0.75 mm thick ( slightly thicker
at the chip end).

The 0.6mm IC MAY just fit in there.
The 1mm thick one wouldn't.


        R
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