MIFARE Ultralight AES vs ST25TV512

Choose MIFARE Ultralight AES if you need larger memory capacity and robust cryptographic authentication for limited-use applications. With 144 bytes of user memory (240 bytes total EEPROM), it provides more than double the storage of the ST25TV512. The chip operates on ISO/IEC 14443-3 Type A protocol at 106 kbit/s and is NFC Forum Tag 2 Type compliant. Security is comprehensive with AES-128 mutual authentication, ECC-based originality signature using secp192r1, CMAC per NIST SP 800-38B, and Random ID support. It includes three 24-bit one-way counters useful for tracking usage limits, a failed authentication limit to prevent brute-force attacks, and 32-bit OTP for permanent configuration. This makes it ideal for transit ticketing systems, hotel key cards, and event access control where secure authentication and moderate data storage are required. Choose ST25TV512 if you need privacy features, tamper detection, and compatibility with ISO/IEC 15693 infrastructure with minimal memory requirements. The chip provides 64 bytes of EEPROM user memory and operates on the ISO/IEC 15693 protocol as an NFC Forum Type 5 tag. Its security architecture focuses on privacy and anti-tampering rather than mutual authentication: it offers two 32-bit passwords (configurable as one 64-bit password), TruST25 digital signature for authentication, Kill mode for permanent deactivation, and Untraceable mode for privacy protection against unauthorized tracking. Optional tamper detection adds physical security, and EAS (Electronic Article Surveillance) functionality supports anti-theft applications. The password encryption feature protects credentials during transmission. This chip suits supply chain tracking, pharmaceuticals authentication, retail anti-counterfeiting, and any application where item-level privacy, tamper evidence, and ISO 15693 compatibility matter more than large memory capacity.