25AA040XT-I/ST [Microchip]

4 Kbit serial Electrically Erasable PROM with SPI bus interface. Features include low-power CMOS technology (write current: 3mA typical, read current: 500μA typical, standby current: 500nA typical), 512 x 8-bit organization, 16-byte page, write cycle time: 5 ms max, self-timed erase and write cycles, block write protection (none, 1/4, 1/2, or all of array), built-in write protection (power on/off data protection, write enable latch, write-protect pin), sequential read, high reliability (endurance: 1M cycles, data retention: >200 years, ESD protection: >4000V), and 8-pin PDIP, SOIC, and TSSOP packages. Temperature ranges: Industrial (I): -40°C to +85°C, Automotive (E) for 25C040: -40°C to +125°C.