Cross-Technology
NFC Type 2 vs Type 4
Type 2 tags (NTAG 21x, Ultralight) are simple, low-cost ICs with basic memory and optional password protection. Type 4 tags (DESFire, NTAG 424 DNA) support ISO 7816-4 commands, multiple applications, and AES encryption for sophisticated secure use cases.
추천
Use Type 2 for cost-effective NDEF storage (URLs, text, vCard); Type 4 when you need file system operations and strong encryption.