>  Does anyone know how much power these cards draw.

It's probably worth mentioning that there are different types of 'these cards' 
to consider.

Smart Cards or Chip Cards usually mean those that have exposed contacts.
RFID or Near Field Cards have internal circuitry as well as an embedded antenna.
Dual Interface Cards have both, and they may be connected (or not).
All of the above may be combined with the old fashioned mag stripe.

ESD is a concern for the smart card industry.  The cards should be immune,
but they can also act as a conduit to couple a charged user to card reader 
terminal.
(particularly when they incorporate holographic foil or other external 
conductive features)

ISO/IEC 7810, 7816, ISO JTC1 SC17 Activities are a good place to start for the 
curious.

-Bob Sykes



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