Microchip Technology AT24C02AN-10SI-2.7

Overview

AT24C02AN-10SI-2.7 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) two-wire serial EEPROM with hardware write protection, optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports 400 kHz I²C clock rate at 2.7V+, delivers 8-byte page writes, and features 1 million write cycles with 100-year data retention.

For engineers reviewing the AT24C02AN-10SI-2.7 datasheet, AT24C02AN-10SI-2.7 pinout, AT24C02AN-10SI-2.7 application, or AT24C02AN-10SI-2.7 equivalent, this device serves as a drop-in replacement for legacy 2K I²C EEPROMs in space-constrained embedded systems requiring robust nonvolatile storage under extended temperature (−40°C to +85°C) and automotive-grade reliability.

Technical Context

The AT24C02AN-10SI-2.7 implements a standard two-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. It uses hardwired A0–A2 address pins to support up to eight devices on a single bus and includes a dedicated WP pin that enables hardware-based upper-half array write protection when pulled high.

Internally organized as 32 pages of 8 bytes each, it supports byte-write and page-write modes with self-timed internal write cycles (≤5 ms), acknowledge polling, and automatic address roll-over during sequential reads - all compliant with I²C protocol timing requirements including tLOW/tHIGH minima at 400 kHz.

Key Specifications

Pinout & Package

AT24C02AN-10SI-2.7 is packaged in an 8-lead JEDEC SOIC (8S1), 3.9 mm × 4.9 mm body, gull-wing lead form with 1.27 mm pitch. Pin 1 is marked by a notch or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C02-RMN6TP and CAT24C02WI-GT3, the AT24C02AN-10SI-2.7 uniquely provides hardware-selectable upper-half write protection - enabling simultaneous access to lower configuration registers while safeguarding critical calibration data - a capability not replicated in either alternative.

Availability

AT24C02AN-10SI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, smart meter firmware storage, and medical diagnostic equipment setup requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AT24C02AN-10SI-2.7 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, FPGA, and memory solutions, with broad industrial and automotive qualification capabilities.

The AT24C02AN-10SI-2.7 belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for reliable, low-power nonvolatile data storage in resource-constrained embedded systems where I²C bus efficiency and hardware data protection are essential.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02AN-10SI-2.7?

The AT24C02AN-10SI-2.7 supports up to 400 kHz I²C clock frequency when operated at VCC ≥ 2.7V. At 1.8V operation (not applicable to this -2.7 variant), the maximum clock rate drops to 100 kHz. The device meets all AC timing specifications including tLOW, tHIGH, and tSU.STA at 400 kHz, ensuring interoperability with standard I²C masters. This performance enables faster configuration writes in time-critical applications without compromising reliability.

Does the AT24C02AN-10SI-2.7 have hardware write protection, and how does it work?

Yes, the AT24C02AN-10SI-2.7 includes a dedicated Write Protect (WP) pin that enables hardware-based memory protection. When WP is tied to VCC, writes to the upper half (1024-bit) of the 2K memory array are disabled while lower-half access remains functional. When WP is grounded, full read/write capability is restored. This feature allows safe storage of immutable calibration data alongside modifiable runtime parameters - a key differentiator versus software-only protection schemes found in many alternatives.

What package type is used for the AT24C02AN-10SI-2.7, and what are its key mechanical dimensions?

The AT24C02AN-10SI-2.7 uses an 8-lead JEDEC SOIC package (8S1), measuring 4.9 mm × 3.9 mm with 1.27 mm lead pitch. Its gull-wing leads comply with IPC-7351B footprint standards, and the body height is ≤1.75 mm. This compact, surface-mount package supports automated assembly and offers superior thermal performance over PDIP variants - making it ideal for dense PCB layouts in industrial controllers and automotive ECUs where space and reliability are constrained.

How many devices can share the same I²C bus with the AT24C02AN-10SI-2.7?

Up to eight AT24C02AN-10SI-2.7 devices can coexist on a single I²C bus using the three hardware address pins A0, A1, and A2. Each combination of A0–A2 sets a unique 3-bit device address, resulting in slave addresses from 0x50 to 0x57 (with the fixed 0b1010 prefix). This addressing flexibility enables scalable system designs - such as multi-sensor nodes or modular control boards - without requiring additional I²C buses or multiplexers.

What is the write endurance and data retention specification for the AT24C02AN-10SI-2.7?

The AT24C02AN-10SI-2.7 guarantees 1,000,000 write/erase cycles per memory location and 100 years of data retention at +25°C. These values are characterized and validated per JEDEC standards, ensuring long-term reliability in applications like firmware parameter logging, calibration storage, and usage counters. Real-world retention extends beyond 100 years at lower ambient temperatures, supporting mission-critical deployments in infrastructure and medical equipment with multi-decade service expectations.