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AT24C02 Two Wire Serial EEPROM

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The AT24C0 series has 5 chips in its name with different specification named 1A/02/04/08A/16A that provides 1024/2048/4096/8192/16384 bits of serial electrically erasable and programmable read-only memory (EEPROM) organized as 128/256/512/1024/2048 words of 8 bits each.


It is an essential device that can be used in many industrial and commercial applications in low-power and low-voltage domains.


The IC supports upto 8 devices in its bus and can retain the data upto 100 years. The communication is done using the I2C protocol.


Pin Description of AT24C02 Two Wire Serial EEPROM

Pin Number

Pin Name




Address Input A0



Address Input A1



Address Input A2






Serial DATA (I2C)



Serial CLOCK Input (I2C)



Write Protect



Power Supply


The pinout is shown in the below image -



Features and specification of AT24C02 EEPROM

  • 256×8 (2 k bit)
  • 400 kHz (1.7V) and 1MHz (>2.5 V) clock compatibility.
  • Supports upto 8 devices on the bus.
  • Self -Timed Erase and Write cycle (5 ms max.)
  • Low power consumption.
  • Read current 0.4 mA (Typ), 1mA (Max) standby current 6uA (Max).
  • Hardware write-protect pin.
  • More than 1 million erase/write cycles.
  • Data retention > 100 years .
  • Extended Temperature Range Available (Grade 1,2 and 3 as defined in AEC - Q 100).

        1.Grade 1 Temperature Range:- 40° c to 125° c

        2. Grade 2 Temperature Range:- 40° c to 105° c

        3. Grade 3 Temperature Range:- 40°c to 85° c

  • Qualified for Automotive Applications.
  • Factory programming Available.


Note: Complete technical details can be found in the AT24C02 Datasheet linked at the bottom of this page.


Alternative product of AT24C02 EEPROM

Alternative products for AT24C02 EEPROM are listed below -

  1. DS2431+ one wire based EEPROM
  2. 24LCxxx based EEPROM
  3. AT28C64B 64 Kbit EEPROM


AT24C02 EEPROM - Overview

AT24C02 EEPROM Overview

The MICROCHIP AT24C02 is a 2 kb serial EEPROM that communicates with the host controller using an I2C (2-wire) serial bus interface. It can retain DATA for at least 100 years with more than 1 million of erase and write cycles. The low power and low voltage features make this EEPROM work into many commercial and consumer grade products. The read current is 0.4 mA typically with a 1mA of maximum. It requires 6uA of maximum current during standby condition.


Interfacing Diagram

The interfacing of the AT24C02 module is quite easy. Follow the below image to connect EEPROM. The EEPROM can be interfaced with any microcontroller unit that has an I2C bus interface.

AT24C02 EEPROM Interfacing Diagram


Applications of AT24C02 EEPROM

  • Data retention
  • Consumer grade product
  • Commercial grade product 


2D and 3D Model

The dimensions of the AT24C02 EEPROM is shown below-

AT24C02 EEPROM Dimensions

Component Datasheet

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