High-Density 16 Kbit SPI F-RAM for Industrial Applications with Wide Operating Range The FM25L16B-G is a 16-Kbit (2K × 8) serial F-RAM with a high-speed SPI interface up to 20 MHz, offering 100 trillion read/write cycles and 151-year data retention at 65°C. Operating from 2.7 V to 3.6 V across -40°C to +85°C, it is a direct hardware replacement for serial flash and EEPROM.