High-Density 4 Mbit SPI Nonvolatile Memory with Industrial Qualification and Wide Operating Range The CY15B104Q-LHXI is a 4-Mbit (512 K × 8) serial F-RAM memory with SPI interface, offering nonvolatile storage with 100 trillion (10¹⁴) read/write cycles and up to 151-year data retention at 65°C. Operating from 2.0 V to 3.6 V and up to 40 MHz, it features low power consumption and advanced write protection. Its fast NoDelay™ writes and 8-pin TDFN package suit industrial controls and data logging applications requiring frequent, rapid writes.