Microchip 25AA02E48-I/SN: A 2Kb Serial EEPROM with Embedded EUI-48™ Node Identity

In the rapidly expanding world of the Internet of Things (IoT), the need for unique device identification is paramount. The Microchip 25AA02E48-I/SN addresses this critical requirement by integrating a pre-programmed, globally unique EUI-48™ identifier within a standard 2Kbit SPI Serial EEPROM. This innovative combination simplifies design, reduces component count, and accelerates time-to-market for connected devices.

This particular IC is a member of Microchip's extensive 25AA series of SPI bus serial EEPROMs. The core memory provides 2 kilobits (256 x 8) of reliable, byte-alterable non-volatile storage, ideal for storing system configuration parameters, calibration data, or small user settings. It supports the fundamental SPI clock frequencies of up to 10 MHz, ensuring efficient communication with a wide range of host microcontrollers.

The defining feature of the 25AA02E48 is its integrated EUI-48™ (Extended Unique Identifier) address. This 48-bit number is burned into the device during manufacturing and is stored in a dedicated, read-only section of the memory array. The EUI-48 is assigned under the official IEEE® registration authority, guaranteeing its global uniqueness. This eliminates the need for manufacturers to source, manage, and program their own MAC addresses, streamlining the production process and preventing address conflicts in networks.

Housed in a space-saving 8-lead SOIC (SN) package, the device is well-suited for compact PCB designs. It offers robust performance characteristics, including a high degree of endurance (1,000,000 erase/write cycles) and data retention (over 200 years). Furthermore, it features hardware write-protection and a proven Schmitt Trigger input structure for excellent noise immunity.

ICGOOODFIND: The Microchip 25AA02E48-I/SN is an optimal solution for designers creating networked devices. It successfully merges essential non-volatile memory with a hardwired, unique node identity, offering significant advantages in system integration, manufacturing logistics, and product reliability.

Keywords: EUI-48, Serial EEPROM, SPI Interface, Unique Identifier, IoT Device.