High-Density 16 kBit SPI F-RAM with Industrial Qualification and Wide Operating Range The FM25L16B-GTR is a 16-Kbit (2K × 8) serial ferroelectric random access memory (F-RAM) with a high-speed SPI interface up to 20 MHz. It delivers virtually unlimited endurance with 100 trillion (10¹⁴) 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 features NoDelay™ writes, advanced write protection, and low power consumption.