Cross-Technology
NFC-A vs NFC-B
NFC-A uses 100% ASK modulation with Modified Miller coding and bit-oriented anti-collision, while NFC-B uses 10% ASK with NRZ-L coding and slot-based anti-collision. NFC-A dominates the market (MIFARE, NTAG), while NFC-B is used in government IDs and some banking cards.
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NFC-A is the default for most applications with the widest ecosystem; NFC-B is required for specific government and banking programs.