Microchip Technology AT24C02AN-10SI-1.8

Overview

AT24C02AN-10SI-1.8 from Microchip Technology (formerly Atmel) is a 2K-bit (256 × 8) two-wire serial EEPROM with 1.8V to 5.5V supply operation, 8-byte page write capability, and hardware write protection via the WP pin. It delivers 100 kHz I²C clock rate at 1.8V, supports −40°C to +85°C industrial temperature range, and is housed in an 8-lead JEDEC SOIC package - ideal for low-power embedded systems requiring nonvolatile parameter storage.

For engineers reviewing the AT24C02AN-10SI-1.8 datasheet, AT24C02AN-10SI-1.8 pinout, AT24C02AN-10SI-1.8 application, or AT24C02AN-10SI-1.8 equivalent, key selection considerations include its 1.8V minimum VCC compliance, Schmitt-triggered noise-immune inputs, 1 million write endurance, 100-year data retention, and compatibility with standard I²C bus timing at reduced voltage.

Technical Context

The AT24C02AN-10SI-1.8 implements a two-wire (I²C-compatible) serial interface with open-drain SDA and active-high SCL, supporting byte and 8-byte page writes. Its internal address counter enables current-address and sequential reads without reissuing the word address.

Hardware write protection is enforced via the WP pin: tied to VCC, it locks the upper half (1K-bit) of memory; tied to GND, full read/write access is enabled. The device uses Schmitt-trigger inputs and input filtering to suppress noise on SDA and SCL lines, ensuring robust operation in electrically noisy environments.

Key Specifications

Pinout & Package

AT24C02AN-10SI-1.8 is packaged in an 8-lead JEDEC SOIC (8S1), 0.150" wide, surface-mount plastic gull-wing outline per MS-012 variation AA.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with M24C02-RMN6TP and BR24G02NUX-10, the AT24C02AN-10SI-1.8 offers unique hardware-enforced write protection via a dedicated pin and guaranteed 100 kHz operation down to 1.8V - delivering deterministic security and low-voltage timing compliance not matched by either alternative.

Availability

AT24C02AN-10SI-1.8 is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical sensor modules, and automotive body control units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AT24C02AN-10SI-1.8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog components, and memory solutions, with a focus on embedded control and connectivity.

The AT24C02A series belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile storage in space-constrained industrial and consumer applications.

FAQ

What is the minimum supply voltage required for reliable operation of the AT24C02AN-10SI-1.8?

The AT24C02AN-10SI-1.8 is rated for operation down to 1.8V, with full functionality including 100 kHz I²C communication, byte/page writes, and read operations. Below 1.8V, timing margins degrade and write cycles may fail; operation outside the 1.8V–5.5V range is not guaranteed and risks data corruption. Always verify VCC stability during brown-out conditions in the target system.

Does the AT24C02AN-10SI-1.8 support true I²C bus compliance, including repeated START and clock stretching?

Yes, the AT24C02AN-10SI-1.8 fully complies with the I²C specification: it recognizes repeated START conditions, responds to STOP conditions with automatic transition to standby mode, and does not implement clock stretching. Its fixed 5 ms internal write cycle is managed via ACK polling - a standard I²C-compliant method for detecting write completion without bus blocking.

How does the WP pin function on the AT24C02AN-10SI-1.8, and what memory region does it protect?

When the WP pin is driven high (to VCC), the AT24C02AN-10SI-1.8 protects the upper half (1024 bits, addresses 0x080–0x0FF) of its 2K-bit memory array from write or erase operations. Lower half (0x000–0x07F) remains writable. When WP is low (GND), full read/write access is granted. This hardware lock operates independently of software commands and persists across power cycles.

Can the AT24C02AN-10SI-1.8 be used in place of the AT24C02AN-10SI-2.7 in an existing design?

Yes - the AT24C02AN-10SI-1.8 is pin-compatible and functionally identical to the AT24C02AN-10SI-2.7, except for its extended low-voltage operation (1.8V–5.5V vs. 2.7V–5.5V). It retains the same SOIC-8 package, pinout, I²C protocol, and memory map. No PCB or firmware changes are needed; however, verify that system-level noise immunity and timing margins remain sufficient at 1.8V.

What is the maximum page write size supported by the AT24C02AN-10SI-1.8, and how does wraparound behave?

The AT24C02AN-10SI-1.8 supports 8-byte page writes. If more than 8 bytes are sent within a single write transaction, the internal address counter wraps around to the start of the same page (e.g., writing 10 bytes to address 0x006 advances to 0x007, 0x008… then 0x000, 0x001), overwriting earlier bytes. To avoid unintended overwrites, limit page writes to ≤8 bytes or align starting addresses to page boundaries (0x000, 0x008, etc.).