24LC256 256Kbit (32KB) I²C Serial EEPROM IC DIP-8 – Microchip

24LC256 256Kbit (32KB) I²C Serial EEPROM IC – DIP-8

The 24LC256 from Microchip Technology is a 256Kbit (32KB) I²C serial EEPROM in a through-hole DIP-8 package – the most popular EEPROM size for Arduino data logging and embedded configuration storage. With 32KB of non-volatile storage accessible over a 2-wire I²C interface, it provides far more storage than the internal EEPROM of most microcontrollers (Arduino Uno has only 1KB). Up to 8 devices can share a single I²C bus for up to 256KB of addressable storage. The DIP-8 package is ideal for breadboard prototyping.

Electrical Specifications

• Part Number: 24LC256 / 24LC256-I/P / AT24C256
• Package: DIP-8 (through-hole, 2.54mm pitch)
• Capacity: 256Kbit = 32KB = 32,768 bytes
• Interface: I²C (2-wire: SDA + SCL)
• I²C Speed: 400kHz (Fast Mode)
• Supply Voltage: 2.5V – 5.5V
• I²C Address: 0x50–0x57 (set via A0, A1, A2 pins)
• Page Write Size: 64 bytes
• Write Cycle Time: 5ms (typical)
• Write Endurance: 1,000,000 cycles
• Data Retention: 200 years
• Operating Temperature: −40°C to +85°C

Arduino Wiring

• Pin 1 (A0), 2 (A1), 3 (A2): Pull to GND for address 0x50
• Pin 4 (VSS): GND
• Pin 5 (SDA): Arduino A4 (with 4.7kΩ pull-up to VCC)
• Pin 6 (SCL): Arduino A5 (with 4.7kΩ pull-up to VCC)
• Pin 7 (WP): GND (write enabled)
• Pin 8 (VCC): 5V

Typical Applications

• Arduino data logging: Store sensor readings and timestamps (32KB = ~16,000 float values)
• Configuration storage: Non-volatile settings for embedded systems
• Calibration data: Store sensor calibration coefficients
• User preferences: Persistent settings in consumer electronics

Package Contents

• 1 × 24LC256 DIP-8 256Kbit I²C EEPROM IC

32KB of reliable I²C non-volatile storage in a breadboard-friendly DIP-8 package – the 24LC256 is the go-to EEPROM for Arduino data logging and embedded configuration storage.

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