The Cypress FM25V20-DG is a 2Mbit (organized 256K x 8) non-volatile Ferroelectric RAM (FRAM) with a serial SPI interface operating at up to 40 MHz. It is part of the F-RAM™ family, which combines the fast write speed and high endurance of SRAM with the non-volatility of Flash or EEPROM — no battery backup required.
The 2Mbit density (256K x 8) with SPI interface is a common footprint for code storage, configuration parameters, or small data logs. The 40 MHz clock frequency supports fast read/write cycles — FRAM writes at bus speed without the write-cycle delays of EEPROM, so no polling or page-write overhead. Supply voltage spans 2V to 3.6V, making it compatible with 3.3V and 2.5V logic systems; no level-shifter needed for a 3.3V MCU. The 8-WDFN Exposed Pad package (5x6 mm DFN) is a surface-mount footprint with a thermal pad, which aids heat dissipation in enclosed or warm environments.
Lifecycle reality — this part is obsolete
The FM25V20-DG carries an official lifecycle status of Obsolete. This means Cypress (now Infineon) has discontinued production, and no further factory orders are accepted.
Sourcing and fit for new designs
A buyer holding an existing BOM line for this part should qualify the supply route through independent distribution. For production continuity, an official replacement from the same F-RAM family exists — see the FAQ for the successor order code.