Microchip announces the introduction of a family of serial EEPROM devices that feature a unique, pre-programmed 32-bit serial number for customers requiring unique IDs in their applications. For applications needing longer than 32-bit IDs, the unique ID can be extended to 48-bit, 64-bit, 96-bit, 128-bit and other lengths by increasing the number of bytes read from memory. Because the 32-bit ID is unique within these devices, any longer bit sequence is also unique. These 2Kb serial EEPROM devices are available in standard busses, such as I2C™, SPI and Microwire, and integrate up to 1.5Kb of memory that can be used as a standard EEPROM. In addition, Microchip has released a 256Kb I2C unique-ID device, which, in addition to the 32-bit serial number, also contains the IEEE EUI-48™ and IEEE EUI-64™ MAC addresses. These IDs are in a write-protected area of the memory, giving users up to 224Kb of EEPROM to use in their applications. Microchip ensures this 32-bit ID is unique across the entire family of 24AA02UID, 24AA025UID, 11AA02UID, 25AA02UID and 24AA256UID unique-ID EEPROM devices. Microchip has also added to its existing EUI-48™ MAC-address portfolio by introducing a family with pre-programmed EUI-64™ MAC addresses.