{"id":1784,"date":"2026-05-12T06:32:11","date_gmt":"2026-05-12T06:32:11","guid":{"rendered":"https:\/\/materialparts.com\/at24c02\/"},"modified":"2026-05-12T06:33:11","modified_gmt":"2026-05-12T06:33:11","slug":"at24c02","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/at24c02\/","title":{"rendered":"AT24C02"},"content":{"rendered":"

En AT24C02<\/strong> by Microchip (formerly Atmel) is a 2 Kbit (256 x 8) I2C serial EEPROM providing nonvolatile data storage with 1 million write cycle endurance and 100-year data retention. It operates from 1.8V to 5.5V<\/strong> with I2C clock rates up to 400 kHz (1 MHz on CS-series FM+ mode). The device supports 8-byte page write with 5 ms self-timed write cycle, up to 8 devices on the same bus via A0-A2 address pins, and hardware write protection via the WP pin. Standby current is typically 6 uA.<\/p>\n

Available in 8-SOIC, 8-PDIP, 8-TSSOP, 5-SOT23, 8-MAP, and 8-dBGA2 packages with industrial (-40 to +85C) and automotive-grade (-40 to +125C) temperature options. The AT24CS02 variant includes a factory-programmed 128-bit unique serial number. RoHS compliant and halogen-free. Target applications include configuration storage, data logging, device identification, and consumer\/automotive electronics.<\/p>","protected":false},"excerpt":{"rendered":"

The AT24C02 by Microchip (formerly Atmel) is a 2 Kbit (256 x 8) I2C serial EEPROM providing nonvolatile data storage with 1 million write cycle endurance and 100-year data retention. It operates from 1.8V to 5.5V with I2C clock rates up to 400 kHz (1 MHz on CS-series FM+ mode). The device supports 8-byte page […]<\/p>\n","protected":false},"author":2,"featured_media":2832,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[40,13],"tags":[],"chip_brand":[134],"class_list":["post-1784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrically-erasable-programmable-read-only-memory-eeprom","category-integrated-circuits-ics","chip_brand-microchip"],"acf":{"brief_explanation":"2-Wire I2C serial EEPROM with 2 Kbit (256 x 8) memory for nonvolatile data storage.","date_code":"","package_case":"8-SOIC \/ 8-PDIP \/ 8-TSSOP \/ 5-SOT23","in_stock":2308,"datasheet":"https:\/\/www.microchip.com\/en-us\/product\/AT24CS02","price":"$0.28 (1 pc, Microchip AT24C02C-XHM-B)","product_introduction":"The AT24C02 is a 2-Wire Serial EEPROM manufactured by Microchip Technology (formerly Atmel), providing 2048 bits (256 x 8) of electrically erasable and programmable read-only memory. The device is accessed via an I2C-compatible serial interface supporting 100 kHz (1.8V) and 400 kHz (2.7V\/5V) clock rates, with newer CS-series variants supporting 1 MHz (FM+) mode above 2.5V.\n\nThe AT24C02 operates from a supply voltage of 1.8V to 5.5V, with 8-byte page write mode and self-timed write cycle of 5 ms maximum. It supports up to 8 devices on the same I2C bus via three address input pins (A0-A2). The WP (Write Protect) pin provides hardware data protection for the entire memory array. Key reliability specifications include 1 million write cycle endurance and 100-year data retention.\n\nThe device is available in multiple package options including 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead TSSOP, 5-lead SOT23, 8-lead MAP, and 8-ball dBGA2. The operating temperature range is -40 to +85C (industrial), with automotive-grade devices supporting -40 to +125C. The AT24C02 is RoHS compliant and halogen-free. The AT24CS02 variant includes a factory-programmed 128-bit unique serial number.","working_principle":"The AT24C02 operates as an I2C slave EEPROM device:\n\n1. I2C Interface: The device communicates via a 2-wire serial bus (SDA for data, SCL for clock). Both lines are open-drain and require external pull-up resistors. The device supports Standard Mode (100 kHz), Fast Mode (400 kHz), and FM+ Mode (1 MHz on CS-series).\n\n2. Device Addressing: The 7-bit slave address consists of a 4-bit device type identifier (1010), followed by three address bits (A2, A1, A0) set by the hardware pins, and a R\/W bit. This allows up to 8 AT24C02 devices on the same bus.\n\n3. Memory Organization: The 2 Kbit memory is organized as 256 words of 8 bits each. Memory is accessed via an 8-bit address byte sent after the slave address during a write or read operation.\n\n4. Write Operation: Supports byte write and page write (8-byte page). During a page write, up to 8 bytes can be written in a single cycle. The internal address counter increments within the page boundary (wraps around within the same page). The self-timed write cycle takes up to 5 ms, during which the device does not acknowledge I2C commands (ACK polling can be used to detect completion).\n\n5. Read Operation: Supports random read (address specified), sequential read (address auto-increments), and current address read (reads from the address of the last access + 1).\n\n6. Write Protection: When the WP pin is connected to VCC, all write operations to the entire memory array are inhibited. Connecting WP to GND allows normal read\/write operations.\n\n7. Power Management: The device enters standby mode when no I2C activity is present, drawing typically 6 uA or less.","pin_description":"\n\n\n
Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n<\/thead>\n
1<\/td>A0<\/td>I<\/td>Address input bit 0 for device selection on I2C bus<\/td><\/tr>\n
2<\/td>A1<\/td>I<\/td>Address input bit 1 for device selection on I2C bus<\/td><\/tr>\n
3<\/td>A2<\/td>I<\/td>Address input bit 2 for device selection on I2C bus<\/td><\/tr>\n
4<\/td>GND<\/td>G<\/td>Ground reference<\/td><\/tr>\n
5<\/td>SDA<\/td>I\/O<\/td>Serial data input\/output (open-drain, requires external pull-up)<\/td><\/tr>\n
6<\/td>SCL<\/td>I<\/td>Serial clock input<\/td><\/tr>\n
7<\/td>WP<\/td>I<\/td>Write protect; HIGH = protect entire array, LOW = normal operation<\/td><\/tr>\n
8<\/td>VCC<\/td>P<\/td>Power supply (1.8V to 5.5V)<\/td><\/tr>\n<\/tbody>\n<\/table>","application_scenarios":"\n\n\n
Application<\/th>Description<\/th><\/tr>\n<\/thead>\n
Configuration Storage<\/td>Stores calibration data, user settings, and configuration parameters that must survive power cycles in embedded systems<\/td><\/tr>\n
Data Logging<\/td>Records small datasets such as event logs, error counters, and diagnostic information in industrial and consumer devices<\/td><\/tr>\n
Device Identification<\/td>AT24CS02 variant with 128-bit factory-programmed serial number for unique device identification and anti-counterfeiting<\/td><\/tr>\n
Consumer Electronics<\/td>Channel presets, volume settings, and user preferences in TVs, audio systems, and home appliances<\/td><\/tr>\n
Automotive Systems<\/td>AEC-Q100 qualified variants for storing ECU parameters, sensor offsets, and diagnostic data in automotive electronics<\/td><\/tr>\n<\/tbody>\n<\/table>","alternative_models":"\n\n\n
Model<\/th>Manufacturer<\/th>Compatibility<\/th>Key Difference<\/th><\/tr>\n<\/thead>\n
AT24C04<\/td>Microchip<\/td>Series Sibling<\/td>4 Kbit (512 x 8), same pinout, same I2C protocol<\/td><\/tr>\n
AT24C16A<\/td>Microchip<\/td>Series Sibling<\/td>16 Kbit (2048 x 8), same pinout, 16-byte page write<\/td><\/tr>\n
24LC02B<\/td>Microchip<\/td>Series Equivalent<\/td>2 Kbit I2C EEPROM, LC series with different addressing scheme<\/td><\/tr>\n
M24C02-W<\/td>STMicroelectronics<\/td>Competitive Alternative<\/td>2 Kbit I2C EEPROM, similar specs, different manufacturer<\/td><\/tr>\n
DS2431<\/td>Maxim\/Analog<\/td>Competitive Alternative<\/td>1-Wire (not I2C) 4 Kbit EEPROM, different interface protocol<\/td><\/tr>\n<\/tbody>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/1784","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=1784"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/1784\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media\/2832"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=1784"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=1784"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=1784"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=1784"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}