24C02N I2C EEPROM — 2K-Bit (256×8), DIP-8, 5V, Arduino Compatible

24C02N I2C EEPROM — 2K-Bit (256×8 Bytes), DIP-8

The 24C02N is a 2K-bit (256 × 8 bytes) serial EEPROM with an I2C two-wire interface, packaged in a standard DIP-8 through-hole package. It provides simple, reliable non-volatile memory storage for microcontroller projects — ideal for storing configuration data, calibration values, user settings, and small data logs that must survive power cycles. Up to 8 devices can share the same I2C bus using the three address pins (A0–A2).

Key Specifications

Parameter	Value
Memory Size	2K-bit (256 × 8 bytes)
Interface	I2C (2-wire serial)
Base I2C Address	0x50
Address Pins	A0, A1, A2 (up to 8 devices per bus)
Supply Voltage	4.5V – 5.5V
Write Protect	WP pin (pull high to enable write protection)
Page Write Size	8 bytes
Write Endurance	1,000,000 cycles
Data Retention	100 years
Package	DIP-8 (through-hole)

Why Use External EEPROM?

• Non-volatile storage — data survives power loss, unlike SRAM or variables in RAM
• Preserve MCU flash — store frequently-changing data in EEPROM instead of wearing out MCU flash
• Multiple devices on one bus — up to 8 × 24C02 on a single I2C bus = 2KB total addressable EEPROM
• Write protection — WP pin allows hardware write-locking of stored data
• Simple I2C interface — works with Arduino Wire.h library out of the box

Wiring (Arduino)

24C02N Pin	Connection
VCC (pin 8)	5V
GND (pin 4)	GND
SCL (pin 6)	Arduino SCL (A5 on Uno)
SDA (pin 5)	Arduino SDA (A4 on Uno)
A0, A1, A2 (pins 1–3)	GND (for address 0x50)
WP (pin 7)	GND (write enabled)

Typical Applications

• Storing device configuration and calibration data
• User settings and preferences in embedded systems
• Small data logging (sensor readings, event counters)
• Boot configuration storage for microcontrollers
• Unique device ID and serial number storage

Frequently Asked Questions

Q: How do I use this with Arduino?

Use the Arduino Wire.h library for raw I2C read/write, or install the extEEPROM library for a higher-level interface. Ground all address pins (A0–A2) and WP for basic single-device operation at address 0x50.

Q: Can I use multiple 24C02N chips on the same I2C bus?

Yes — up to 8 devices. Set each chip to a unique address by connecting A0–A2 to different combinations of VCC and GND (addresses 0x50–0x57).

Package Contents

• 1× 24C02N I2C EEPROM DIP-8 IC

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