The 25AA040/P is a 4K (4096 bits) Serial EEPROM manufactured by Microchip. It is a 25-millimeter square, 8-pin memory device that has an access time of 1 microsecond. It uses a simple two-wire interface for accessing and programming memory. The device offers users an extended operating temperature range of -40 to 85 degrees Celsius and has an endurance rating of 1 million write cycles. The 25AA040/P features a 4K-bit memory array with flexible block-write capabilities and low standby current consumption of 5 microamps. It is ideal for storing data such as product codes, parts numbers and user IDs, and is compatible with most Microcontroller, DSP and MPU applications.