Microchip Technology AT24C02N-10SI-2.7-T

Overview

AT24C02N-10SI-2.7-T from Microchip Technology (formerly Atmel) is a 2K-bit (256 × 8) I²C-compatible serial EEPROM optimized for low-voltage embedded systems. It operates from 2.7V to 5.5V, supports 100 kHz I²C bus speed, features hardware write protection via the WP pin, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage, power meter configuration memory, and firmware parameter backup.

For engineers reviewing the AT24C02N-10SI-2.7-T datasheet, AT24C02N-10SI-2.7-T pinout, AT24C02N-10SI-2.7-T application, or AT24C02N-10SI-2.7-T equivalent, key selection considerations include its 2.7–5.5V supply range, 8-byte page write capability, SOIC-8 package, industrial temperature rating (−40°C to +85°C), and I²C address compatibility with A0–A2 hardwired inputs.

Technical Context

The AT24C02N-10SI-2.7-T implements a standard two-wire I²C interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its internal 256-word × 8-bit array is organized into 32 pages of 8 bytes each, requiring an 8-bit word address for random access.

Write protection is enforced by the WP pin: tied to VCC, it locks the full 2K array; tied to GND, full read/write access is enabled. The device enters standby mode after STOP condition receipt and supports acknowledge polling to detect write completion.

Key Specifications

Pinout & Package

AT24C02N-10SI-2.7-T is housed in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide, with gull-wing leads and standard 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02N-10SI-2.7-T, M95020-RMN6TP trades I²C simplicity for SPI speed and lacks hardware write protection, while BR24G02FJ-WE2 adds automotive qualification and ECC at the cost of higher unit price and different package (SOP-J8).

Availability

AT24C02N-10SI-2.7-T is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical sensor calibration, and automotive body control applications requiring stable component supply across multi-year production cycles.

Supply support for AT24C02N-10SI-2.7-T 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 devices, and memory solutions, with a focus on embedded control and connectivity.

The AT24Cxx family was designed for cost-sensitive, low-power embedded systems needing reliable, byte-addressable nonvolatile storage with minimal pin count and board space.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02N-10SI-2.7-T?

The AT24C02N-10SI-2.7-T supports up to 100 kHz I²C clock frequency when operating within its 2.7–5.5 V supply range. This limit ensures robust timing margins under industrial temperature and noise conditions. It does not support 400 kHz operation - that speed is only guaranteed for 5.0 V versions (e.g., AT24C02-10SI). The 100 kHz rating directly impacts bus throughput and must be accounted for in real-time system timing budgets.

Does the AT24C02N-10SI-2.7-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C02N-10SI-2.7-T requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL input is Schmitt-triggered but not actively driven. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; 4.7 kΩ is commonly used for 100 kHz operation with ≤400 pF total bus capacitance. Omitting pull-ups will prevent I²C communication entirely.

How many AT24C02N-10SI-2.7-T devices can share the same I²C bus?

Up to eight AT24C02N-10SI-2.7-T devices can coexist on a single I²C bus. This is enabled by the three hardware address pins (A0, A1, A2), each configurable as high or low to generate a unique 3-bit device address portion. The full 7-bit slave address is formed as 1010 + A2A1A0 + R/W, allowing 2³ = 8 distinct addresses. No software address assignment is needed - addressing is purely physical and fixed at PCB layout.

What happens when the WP pin of the AT24C02N-10SI-2.7-T is left floating?

The WP pin of the AT24C02N-10SI-2.7-T must not be left floating: it has no internal pull-up or pull-down. A floating WP pin may result in indeterminate write protection behavior - potentially enabling unintended writes or blocking legitimate updates. For guaranteed operation, WP should be hard-wired to either GND (enabling full read/write access) or VCC (locking the entire 2K array against writes). A 10 kΩ pull-down resistor is recommended if dynamic control is not required.

Is the AT24C02N-10SI-2.7-T pin-compatible with other AT24Cxx variants like AT24C01A or AT24C04?

Yes, the AT24C02N-10SI-2.7-T is pin-compatible with AT24C01A, AT24C04, AT24C08, and AT24C16 in the same SOIC-8 (8S1) package - all share identical pinout: A0/A1/A2/GND/VCC/WP/SCL/SDA. However, memory size, page length, and address-bit usage differ: AT24C02 uses all three address pins, while AT24C04 leaves A0 as NC. Firmware must match the actual device's memory map and addressing scheme.