NTAG215 vs ST25DV
NTAG215 offers 504 bytes memory with 32-bit password security, making it ideal for Nintendo amiibo, product tags, marketing posters. ST25DV provides 4-64 Kbit with 64-bit password + configurable areas security, suited for IoT sensors, smart labels, energy harvesting, BLE pairing.
NTAG 215
ST25DV
NTAG215 vs ST25DV: Passive NDEF Tag vs. Dynamic Dual-Interface IoT Tag
NTAG215 is a passive tagpassive tagBatteryless tag powered by reader's electromagnetic fieldView full → optimized for consumer smartphone interactions. ST25DV from STMicroelectronics is a dual-interface IoT device that combines NFC-V wireless access with I2C wired connectivity — enabling live data sharing between an embedded system and a smartphone.
Overview
NTAG215 stores up to 492 bytes of NDEF data configured by an NFC readerNFC readerActive device generating RF field to initiate communication with tagsView full →. It is read-only from the smartphone perspective (or writable if not locked). There is no secondary interface; it is a pure passive NFC tagNFC tagPassive unpowered device storing data, powered by reader's RF fieldView full →.
ST25DV is an ISO 15693ISO 15693Standard for vicinity-range smart cards, 1+ meter read rangeView full → (NFC-V) dual-interface chip providing simultaneous NFC RF and I2C access. Up to 64 KB of EEPROMEEPROMNon-volatile memory technology retaining data without powerView full → is accessible from both interfaces. A microcontroller connected via I2C can update tag content in real time, making the NFC interface a live window into device state. It also supports energy harvesting from the RF field to power connected circuitry.
Key Differences
- Dual interface: NTAG215 — RF only. ST25DV — RF (NFC-V) + I2C simultaneously.
- Dynamic content: NTAG215 stores static or semi-static NDEF. ST25DV stores MCU-updated live data — enabling real-time sensor readings, configuration, and status display via NFC tap.
- Memory: NTAG215 — 492 bytes. ST25DV — 4/16/64 KB EEPROM.
- Energy harvesting: ST25DV can extract DC power from NFC reader field to supply an MCU. NTAG215 cannot.
- Protocol: NTAG215 — NFC-A (ISO 14443ISO 14443Standard for contactless smart cards at 13.56 MHz (Types A and B)View full →-A). ST25DV — NFC-V (ISO 15693). Different reader support requirements.
- Amiibo: NTAG215 only — ST25DV is not Amiibo-compatible.
- Complexity: ST25DV requires MCU firmware and I2C integration. NTAG215 requires nothing.
Use Cases
Choose NTAG215 when: - Passive, smartphone-readable NDEF delivery is sufficient - Amiibo compatibility is required - No embedded MCU or I2C interface is part of the design
Choose ST25DV when: - A device must broadcast live data (temperature, battery, status) via NFC tap - Bidirectional RF + I2C communication is required in the design - Energy harvesting from NFC field is needed to supplement MCU power supply - IoT device configuration via smartphone is a product feature
Verdict
NTAG215 is a passive label. ST25DV is an embedded IoT interface chip. Select ST25DV only when an MCU with I2C is part of the hardware design and live data NFC broadcasting is a product requirement. For simple passive NFC tagging, NTAG215 is simpler, cheaper, and universally supported.
Recomendación
Choose NTAG215 when you need mid-range Type 2 tag used in amiibo; choose ST25DV when you need dual-interface (NFC + I2C) with energy harvesting.