The size and structure of the iClass card memory varies. It is divided into card size and application allocation.


  2K / 2 Application

  16K / 2 Application

  16K / 16 Application

  32K (16K / 2 + 16K / 1)

  32K (16K / 16 + 16K / 1)

  ....


For example, block index can be seen as below in case of 2K non-configured card, 2K configured card and 2K programmed card. 



iClass 2K/2




2K/2 Card = 2 * 1024 bits = 256 bytes 


Recommended template size is minimum 300 bytes so you can't write template data in 2K/2 card due to size but you can use as Bypass card when you want to use it as a smart card.


iClass 16K/2




iClass 16K/16



1 Block = 8 bytes

1 Page = 2 Application

The application consists of blocks. The number of blocks differs depending on the application size.