Adafruit SPI Non-Volatile FRAM Breakout - 4 Mbit / 512 KBytes - MB85RS4MT

FRAM (Ferroelectric RAM) offers a breakthrough in non-volatile memory combining fast write performance with extremely high endurance. This SPI FRAM breakout board features a 4 Mbit (512 KBytes) MB85RS4MT chip, capable of operating at up to 40 MHz SPI clock speeds.

The board includes a built-in 3.3V logic level shifter and regulator, making it compatible with both 3V and 5V systems. Its low power consumption and instantaneous byte-level access make it ideal for data logging, buffering, or any situation requiring frequent writes and reliable data retention.

• 4 Mbit (512 KBytes) FRAM storage
• SPI interface, compatible with SPI modes 0 and 3
• Operating frequency up to 40 MHz
• Extremely high endurance: up to 10 trillion writes per byte
• Data retention up to 95 years at 55 °C
• Low power operation at 2.6 mA max @ 40 MHz
• Wide operating temperature range: -40 °C to +85 °C
• 3.3V logic level shifting and regulator onboard

Each byte can be read and written instantaneously without the need to worry about wear leveling as with EEPROM or flash. The board comes breadboard-friendly with the standard 0.1" pitch headers included.

For detailed schematics, diagrams, datasheets, and example code for Arduino and CircuitPython, check out the Adafruit SPI FRAM usage guide.

Note: As of May 20, 2024, the PCB has been updated with Adafruit Pinguin for improved silkscreen. The voltage regulator may vary due to parts availability but guarantees at least 100mA supply.