Integrating Secure and Unique Device Identification with the Microchip 24AA025UID-I/SN

In the expanding universe of the Internet of Things (IoT) and connected devices, the need for secure, reliable, and unique identification at the hardware level is paramount. The Microchip 24AA025UID-I/SN addresses this critical requirement by combining a standard 2Kbit Serial EEPROM with a factory-programmed, globally unique 64-bit node identity. This integration simplifies design, enhances security, and streamlines network management for a vast array of applications.

This device is built on a robust I2C serial interface, operating across a broad voltage range (1.7V to 5.5V), making it compatible with a wide spectrum of microcontrollers and processors. The 2Kbit memory array, organized in 256 x 8-bit blocks, is ideal for storing application-specific data, configuration parameters, or system settings. It features a page write buffer for up to 16 bytes of data and hardware write-protection capabilities, ensuring data integrity.

The defining feature of the 24AA025UID is its pre-programmed 64-bit unique identifier (UID). This immutable value is composed of a 24-bit company ID (assigned by the IEEE) and a 40-bit unique serial number, effectively providing a globally unique EUI-48™ or EUI-64™ compliant node identity. This eliminates the significant logistical overhead and potential errors associated with manually programming and managing unique IDs during manufacturing. Designers can leverage this hardwired identity for secure device authentication, inventory management, and as a fundamental hardware root of trust.

Typical applications are widespread, including:

IoT Sensor Nodes: Providing a unique MAC address or secure identifier for network enrollment.

Industrial Control Systems: Enabling asset tracking and authentication of system modules.

Consumer Electronics: Storing device-unique data and supporting anti-counterfeiting measures.

Medical Devices: Ensuring traceability and secure identification of medical equipment.

The device is offered in the space-saving 8-lead SOIC package, making it suitable for compact PCB designs.

ICGOOODFIND: The Microchip 24AA025UID-I/SN is an optimal solution for designers seeking to embed a guaranteed unique identity directly into their hardware. It successfully merges the utility of non-volatile memory with the critical security and management advantages of a factory-lasered UID, reducing complexity and cost while future-proofing device networks.

Keywords: Unique Identifier (UID), I2C Serial EEPROM, Device Authentication, EUI-48, Hardware Security.