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ST25DV

The STMicroelectronics ST25DV is an NFC tag IC, with 4 Kbit, 8 Kbit, 16 Kbit, or 64 Kbit (512 bytes to 8 Kbytes) EEPROM, operating at 13.56 MHz (NFC/RFID) + I2C interface, under ISO/IEC 15693 NFC Forum Type 5.

Dynamic NFC/RFID tag with fast transfer mode, I2C interface, energy harvesting, and dual-interface memory for IoT applications

Official Datasheet ↗
Frequency
13.56 MHz (NFC/RFID) + I2C interface
Protocol
ISO/IEC 15693, NFC Forum Type 5
Memory
4 Kbit, 8 Kbit, 16 Kbit, or 64 Kbit (512 bytes to 8 Kbytes) EEPROM
Interface
RF (contactless 13.56 MHz), I2C (up to 1 MHz)
Temp Range
-40°C to +85°C
Form Factor
SO8, TSSOP8, UFDFPN8

Full Specifications

ManufacturerSTMicroelectronics
Frequency CategoryNFC
Frequency13.56 MHz (NFC/RFID) + I2C interface
ProtocolISO/IEC 15693, NFC Forum Type 5
Memory4 Kbit, 8 Kbit, 16 Kbit, or 64 Kbit (512 bytes to 8 Kbytes) EEPROM
InterfaceRF (contactless 13.56 MHz), I2C (up to 1 MHz)
Temperature Range-40°C to +85°C
Form FactorSO8, TSSOP8, UFDFPN8
Security64-bit unique identifier, password protection (64-bit), RF write protection areas

Engineering Brief

The ST25DV is a dual-interface dynamic NFC tag that combines ISO 15693 RF communication at 13.56 MHz with a fast I2C interface, enabling simultaneous access from both microcontroller and NFC reader. It features Fast Transfer Mode for accelerated data exchange (up to 53 kbps), integrated energy harvesting capability to power external circuits from the RF field, and flexible memory partitioning with configurable access rights. Available in multiple memory densities (4K to 64Kbit EEPROM), it's ideal for IoT applications requiring wireless configuration, data logging, and NFC-based user interaction without draining system batteries.

Typical Applications

Standards & Compliance

Frequently Asked Questions

What memory sizes are available for the ST25DV NFC tag?

The ST25DV is available in four memory densities: 4 Kbit (512 bytes), 8 Kbit (1 KB), 16 Kbit (2 KB), and 64 Kbit (8 KB) EEPROM. All variants support dual-interface access via NFC and I2C.

What is the Fast Transfer Mode data rate of the ST25DV?

The ST25DV's Fast Transfer Mode enables RF data exchange at up to 53 kbps, significantly faster than standard ISO 15693 communication. This accelerates NFC read/write operations for time-sensitive applications.

Can the ST25DV power external circuits from NFC field?

Yes, the ST25DV includes integrated energy harvesting capability that extracts power from the 13.56 MHz RF field. This harvested energy can power external microcontrollers or sensors without using system batteries.

Does the ST25DV support simultaneous NFC and I2C access?

Yes, the ST25DV features true dual-interface operation, allowing a microcontroller to access memory via I2C (up to 1 MHz) while an NFC reader simultaneously communicates over the RF interface at 13.56 MHz.

What security features does the ST25DV include?

The ST25DV provides a 64-bit unique identifier for authentication, 64-bit password protection for secure access control, and configurable RF write protection areas to prevent unauthorized modification of memory sections.

Is the ST25DV compatible with NFC Forum Type 5 devices?

Yes, the ST25DV complies with both ISO/IEC 15693 and NFC Forum Type 5 standards, ensuring compatibility with standard NFC readers and smartphones supporting the Type 5 tag specification.

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