AT24C256 I2C Interface EEPROM Memory Module (256K Non-Volatile Storage Board)
Expand the data logging capacity and parameter retention of your microcontrollers with the industrial-grade AT24C256 I2C EEPROM Memory Module. Powered by the highly stable AT24C256 Electrically Erasable Programmable Read-Only Memory integrated circuit, this breakout board adds 256 kilobits (32 kilobytes) of secure, non-volatile storage to your automation systems using a simple, space-saving 2-wire serial connection.
Standard microcontrollers often feature limited internal memory that gets completely erased during power loss or system resets. The AT24C256 module acts as a solid-state data vault, keeping your critical tracking logs, device calibration charts, system network configurations, and user settings safe and intact even when the central power grid is completely shut down. It serves as the definitive choice for remote environmental data loggers, industrial runtime trackers, smart home parameter hubs, and autonomous robotics arrays.
Key Features
Massive Non-Volatile Storage Grid: Provides 256,144 bits of organized flash memory space, structured internally as 32,768 bytes of 8-bit registers to handle dense data logging arrays.
Unified 2-Wire Serial Interface: Communicates seamlessly over the shared inter-integrated circuit bus (Data and Clock lines), preserving your microcontroller's digital input/output channels for other hardware tasks.
Onboard Hardware Address Jumpers: Built with three configurable hardware jumper selectors (A0, A1, and A2) allowing you to manually modify the device's bus address. This lets you chain up to 8 independent EEPROM modules onto the exact same shared bus layout.
Integrated Write-Protect Safety: Features a dedicated, hardware-routed Write-Protect pin breakout that lets you lock the memory array completely, shielding your archived historical logs against accidental overwrites or software bugs.
High-Endurance Data Lifecycle: Engineered for continuous, heavy-duty tracking applications, supporting up to 1,000,000 write cycles and maintaining complete data integrity for over 100 years.
Onboard Pull-Up Resistors: Assembled with integrated pull-up resistors on both the serial data and clock lines, ensuring clean logic transitions and minimizing the need for external breadboard components.
Technical Specifications
Feature | Specification |
Core Memory Chipset | High-Stability AT24C256 Serial EEPROM IC |
Storage Capacity | 256 Kilobits / 32 Kilobytes (32,768 Bytes) |
Communication Protocol | I2C / IIC Serial Bus Protocol |
Operating Voltage Range | 2.7V to 5.5V DC Nominal |
Default Hardware Address | Typically 0x50 (When all address pins are pulled low) |
Maximum Clock Frequency | 400 Kilohertz (At 5V operation) | 100 Kilohertz (At 2.7V operation) |
Page Write Architecture | Supports 64-Byte page write operations |
Data Retention Life | Greater than 100 Years |
Board Dimensions | 36.5 mm x 12 mm x 11 mm |
Hardware Wiring & Interface Pinout
The module breaks out a highly organized interface that connects directly to development platforms like Arduino, ESP32, STM32, and Raspberry Pi:
VCC: Main power input rail. Connects to the +3.3V or +5V DC power source of your host microcontroller.
GND: System Common Ground Reference.
SCL (Serial Clock Line): The synchronous clock timing path. Connects straight to the dedicated SCL pin on your microcontroller.
SDA (Serial Data Line): The bidirectional serial data pipeline. Connects straight to the dedicated SDA pin on your microcontroller.
WP (Write Protect): Hardware safety control line.
Floating/Low: Normal read and write operations are fully enabled.
Pulled High (VCC): Locks the memory array completely, turning the module into a read-only device for maximum data security.
Common Applications
Remote Environmental Data Acquisition: Periodically store timestamped metrics from temperature probes, humidity nodes, and air quality gas modules in outdoor areas.
Industrial Runtime Control Logs: Archive machinery operational hours, custom tool positioning variables, and manufacturing line calibration settings safely.
Smart Home Configuration Hubs: Store user security access codes, preferred room illumination brightness values, and Wi-Fi credential arrays locally.
Robotic Movement Arrays: Save complex coordinate paths, structural boundary limitations, and autonomous routine maps on mobile robotic platforms.
💡 Pro-Engineering Multi-Node Jumper Guide: If you need to stack multiple AT24C256 boards together to expand your storage space, locate the unpopulated A0, A1, and A2 address pads on the module. By bridging these pads with a small bead of solder to tie them high or low, you can shift the I2C address between 0x50 and 0x57, allowing the master processor to access each chip independently on the same two wires.
Package Includes:
1 x AT24C256 I2C Interface EEPROM Memory Module (Breakout Board)