The CY15B104QSN-108LPXIT is a 4-Mbit EXCELON™ Ultra Ferroelectric RAM (F-RAM) offering real-time, non-volatile data storage with 100 trillion read/write cycles endurance and 151-year data retention. Operating from 1.8 V to 3.6 V, it supports quad SPI up to 108 MHz (SDR) and 54 MHz (DDR), with low active current. Features include on-die ECC, CRC, write protection, and a dedicated 256-byte special sector.