MIFARE Ultralight EV1 vs ST25TV02K

Choose MIFARE Ultralight EV1 if you need ISO/IEC 14443 Type A compatibility and NFC Forum Type 2 support for smartphone applications, public transit, or loyalty cards. The MF0UL11 variant provides 48 bytes user memory (80 bytes total) and the MF0UL21 offers 128 bytes user memory (164 bytes total). This chip excels in applications requiring three 24-bit one-way counters for usage tracking, an ECC-based originality signature to verify genuine tags, and optional password attempt limiting to prevent brute-force attacks. The 32-bit password protection, 32-bit OTP area, and field-programmable read-only locking per page provide flexible security configurations. Available in 17 pF or 50 pF antenna tuning variants, it suits compact designs like keyfobs, wristbands, and labels where close-coupling (up to 10 cm read range) is acceptable. Choose ST25TV02K if you require ISO/IEC 15693 or ISO 18000-3 mode 1 compatibility with NFC Forum Type 5 support, offering longer read ranges (up to 1.5 meters depending on antenna design) suitable for item-level tagging, logistics, or inventory management. With 256 bytes EEPROM organized in 64 blocks of 4 bytes, it provides double the memory of the larger Ultralight EV1 variant and simpler block-based memory architecture. The energy harvesting output pin enables powering external sensors or LEDs directly from the RF field, making it suitable for smart packaging, temperature monitoring labels, or battery-free indicators. Security includes 32-bit password protection, lock bits, and AFI (Application Family Identifier) for application-specific addressing. The ISO 15693 protocol allows anti-collision for reading multiple tags simultaneously, beneficial in warehouse or library applications where bulk scanning is required.