NXP RFID chip is based on two ISO standards: ISO15693 and ISO14443
The ISO15693 standard is considered “Boundary” because it guarantees a reading distance of up to 1.5 meters, while the ISO14443 standard is considered a “Nearby Standard” because the reading distance is lower, only 12 cm. The second difference is represented by user memory encoding, present in most ISO14443 chips. Specifically, the chips are divided according to standards as follows:
ISO 15693 chip
NXP I-Code SLI2 (-X): is the most used chip with 1024 bits of user memory
NXP I-Code SLI-S:Chip with 2048bit memory and separate key and user memory management functions
STM LRi2K: Chip with 2048bit memory
ISO 14443 chip
NXP Mifare Ultralight:Low memory chip (384 bit) without encryption, this is the cheapest and simplest with UID series made up of 14 hexa characters
NXP Mifare Ultralight C: 1152bit portable user memory chip with 3-DES encryption
NXP Mifare Classic 1K (4K): Low memory chip: 1024 Byte (1KB) or 4096 Byte (4KB) with encryption. The encryption protocol was hacked in 2008 by some students of a Virginia university. However, this chip is still used today, because of its universality and because it is no longer easy to hack
NXP Mifare Plus 2K (4K): Chip with 2048 Byte (2KB) or 4096 Byte (4KB) memory with AES encryption. The chip was designed to replace the Mifare Classic chip, but did not achieve the expected success
NXP Mifare Desfire 2K, 4K, 8K:
Chip with memory 2048 Bytes (2KB) or 4096 Bytes (4KB) up to 8192 Bytes (8K) and 3Des encryption
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