2 Mbit serial FRAM with 40 MHz SPI — what it replaces and where it fits
The Cypress FM25V20A-DG is a 2 Mbit non-volatile FRAM organized as 256K x 8 bits, accessed over an SPI bus at up to 40 MHz. The part operates from 2 V to 3.6 V and is specified over the industrial temperature range of -40°C to 85°C, making it a direct fit for metering, industrial data loggers, and battery-backed SRAM replacement where the battery is the reliability concern.
Comparison to the reel variant FM25V20A-GTR
The FM25V20A-GTR is electrically and mechanically identical — same 2 Mbit FRAM, same SPI at 40 MHz, same 8-DFN package. The only difference is the shipping medium: Tube for the -DG, Tape & Reel for the -GTR. If your assembly house feeds from reels, order the -GTR; if you hand-place prototypes or use tube-fed equipment, the -DG is the correct line item.