The AT24C256 I2C EEPROM Module is a non-volatile serial memory device used to store small amounts of persistent data such as:

• Configuration settings

• Calibration data

• Device IDs

• Sensor logs

• User preferences

It is commonly used in embedded systems and IoT applications.

The AT24C256 offers:

• 256 Kilobit memory

• Equivalent to 32 Kilobytes (KB) of storage

It is ideal for applications that require reliable long-term data storage without large memory requirements.

This module uses the I2C (Two-Wire Interface) protocol:

• SDA (Data)

• SCL (Clock)

It supports multiple devices on the same I2C bus and allows configurable I2C address selection via onboard address pins.

Yes, it is compatible with:

• ESP32 (3.3V logic)

• ESP8266

• STM32

• Arduino

• Raspberry Pi

Most breakout modules support 3.3V to 5V operation, but always check module specifications before direct connection.

Yes. The AT24C256 is a non-volatile EEPROM, meaning data remains stored even after power is removed.
It typically supports:

• Up to 1 million write cycles

• Data retention of 20+ years

Common use cases include:

• Storing device configuration in IoT projects

• Calibration data storage

• Data logging systems

• RFID and security applications

• Industrial automation memory backup

• Embedded firmware parameter storage