The Adafruit SPI Non-Volatile FRAM Breakout provides 2 Mbit (256 KBytes) of ferroelectric RAM (FRAM) storage over SPI. FRAM combines the non-volatile retention of flash with the instant read/write speed of SRAM — no page writes, no block erasing, and each byte can be written 10 trillion times without wear concerns.

The MB85RS2MTA chip runs at up to 40 MHz SPI clock speeds and retains data for 95 years at room temperature. The breakout includes 3.3V level shifting and a regulator, so it works with both 3V and 5V logic. Ideal for fast, low-power data logging where you need reliable storage even when power is inconsistent.

Key Features

• MB85RS2MTA FRAM Chip – 2 Mbit (256 KBytes) non-volatile ferroelectric RAM
• SPI Interface – Up to 40 MHz clock speed
• Instant Read/Write – No page writes or block erasing required
• 10 Trillion Write Cycles – Virtually unlimited endurance per byte
• 95-Year Data Retention – At room temperature
• Level Shifting + Regulator – Compatible with 3V and 5V logic
• Breadboard-Friendly – Includes 0.1" header

Ideal For

• High-speed data logging and buffering
• Low-power or inconsistent-power applications
• Frequent read/write scenarios where EEPROM wear is a concern
• Non-volatile storage that needs SRAM-like speed

Package Contents

• 1× SPI FRAM breakout board (MB85RS2MTA, 2 Mbit)
• 1× Header strip

Resources

• Adafruit SPI FRAM Breakout Guide – Schematics, datasheets, and example code for Arduino and CircuitPython