DESFire EV1 4K and 8K chip is made by NXP and it has a total memory of 4096 and 8192 bytes respectively. The usable memory size is 4094 or 7678 bytes. It is NFC Forum Type 4 Tag compliant. DESFire EV1 is able to store very large data including long URL, long text and vCard. It also has security encryption capability.
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