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ST25 subbrand

The ST25D secure series makes device interactions simple and keeps data safe. It offers secure communication through both a contactless NFC/RFID interface and a wired I²C interface to connect easily with microcontrollers or microprocessors.

What is the ST25D secure series?

The secure series is the easiest way to bring wireless short-range connectivity and security to any IoT device. The series includes NFC Forum Type 4 dynamic tags that operate at high frequency (13.56 MHz) and ready-to-use security features. It comes with a secure element and embeds secure services. Data stored can be securely accessed using any smartphone, NFC/RFID HF professional reader, or a microcontroller via the I²C wired interface.

Diagram showing an NFC-enabled smartphone communicating wirelessly with an ST25DA-C NFC tag featuring security capabilities. The ST25DA-C is connected via an I2C interface to an MCU (microcontroller unit), enabling secure bidirectional data exchange.

Applications

Secure sensitive data and ease device onboarding

Connected nodes
Gateway

Secure patient data and enable unreached data transfer

Product types

The ST25DA-C dynamic tags simplify secure data storage and make it easier to add any object or device to a Matter network. They offer Matter services supported by hardware and software security features.

  • NFC Forum Type 4
  • ISO14443-A
  • I²C interface, 1.62 V - 3.3 V
  • ECDSA with SHA-256
  • ECDH for key establishment
  • AES-128
  • Matter commissioning over NFC (v.1.5 & beyond)
  • SPAKE2+ & PAKE protocols
  • Secure storage for certificates and keys
  • Matter signature generation and verification over I²C

Benefits

  • Allows battery-less Matter commissioning over NFC
  • Improves user experience through NFC features and capabilities
  • Eases installation for multiple devices on a Matter network
  • Offers cryptographic services based on PKI (public key infrastructure)