Microchip Technology AT24C02A-10PI-2.7

Overview

AT24C02A-10PI-2.7 from Microchip Technology (formerly Atmel) is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8 bits, operating from 2.7V to 5.5V with 100 kHz clock rate at 1.8V and 400 kHz at ≥2.5V. It features hardware write protection via the WP pin, Schmitt-trigger inputs for noise immunity, and 8-byte page write capability. It is used in industrial sensor calibration storage, embedded system configuration memory, and power-meter firmware parameter retention.

For engineers reviewing the AT24C02A-10PI-2.7 datasheet, AT24C02A-10PI-2.7 pinout, AT24C02A-10PI-2.7 application, or AT24C02A-10PI-2.7 equivalent, key selection considerations include its 2.7–5.5 V supply range, 8-pin PDIP package with GND/VCC/SDA/SCL/WP/A0–A2 terminals, automotive-grade −40°C to +85°C operation, and compatibility with microcontroller I²C peripherals requiring low-power, high-reliability nonvolatile storage.

Technical Context

The AT24C02A-10PI-2.7 implements a two-wire I²C interface with open-drain SDA and active-high SCL, supporting standard-mode (100 kHz) and fast-mode (400 kHz) timing. Its internal address counter enables current-address and sequential reads, while device addressing uses A0–A2 pins for up to eight devices on one bus.

Write protection is enforced by the WP pin: tied to VCC, it locks the upper 1K-bit half of memory; tied to GND, full read/write access is enabled. The device performs self-timed internal write cycles (≤5 ms), supports partial page writes, and includes Schmitt-triggered, filtered inputs to suppress EMI in noisy industrial environments.

Key Specifications

Pinout & Package

AT24C02A-10PI-2.7 is housed in an 8-pin plastic dual in-line package (PDIP), 0.300" wide, with through-hole mounting and JEDEC MS-001 BA compliance. Pin 1 is marked by a notch or dot; leads are gull-wing shaped and tin-plated.

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 AT24C02A-10PI-2.7 uniquely combines industrial temperature rating, hardware WP pin, PDIP through-hole compatibility, and guaranteed 400 kHz I²C performance at 2.7 V - making it optimal for legacy industrial control upgrades and repair scenarios requiring drop-in mechanical and electrical equivalence.

Availability

AT24C02A-10PI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy meter configuration, and embedded bootloader settings requiring stable component supply across extended product lifecycles.

Supply support for AT24C02A-10PI-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 devices, and nonvolatile memory solutions, with a focus on reliability and long-term product support.

The AT24C02A-10PI-2.7 belongs to Microchip's legacy serial EEPROM product line, designed specifically for industrial and automotive applications demanding robust I²C communication, hardware data protection, and extended temperature operation.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02A-10PI-2.7?

The AT24C02A-10PI-2.7 supports up to 400 kHz I²C clock frequency when operated at VCC ≥ 2.5 V (including 2.7 V and 5 V). At 1.8 V, the maximum clock rate is 100 kHz. These values are specified in the AC Characteristics table and validated across the full −40°C to +85°C temperature range. The AT24C02A-10PI-2.7 does not support higher rates such as 1 MHz fast-mode plus.

How does the Write Protect (WP) pin function on the AT24C02A-10PI-2.7?

When the WP pin of the AT24C02A-10PI-2.7 is connected to VCC, the upper 1K-bit half of the memory array (addresses 0x0080–0x00FF) is write-protected; all other addresses remain writable. When WP is grounded, full read/write access is enabled across the entire 256-word space. This hardware lock operates independently of I²C commands and persists across power cycles.

Is the AT24C02A-10PI-2.7 compatible with 3.3 V microcontrollers?

Yes, the AT24C02A-10PI-2.7 is fully compatible with 3.3 V microcontrollers: its 2.7–5.5 V supply range includes 3.3 V nominal operation, and its I²C interface meets standard-mode voltage thresholds (VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC) at that rail. Pull-up resistors should be referenced to the same 3.3 V supply as the MCU's I/O, and the AT24C02A-10PI-2.7's VOL remains ≤ 0.4 V at 3.0 V with 2.1 mA sink current.

What package type is used for the AT24C02A-10PI-2.7?

The AT24C02A-10PI-2.7 uses an 8-pin plastic dual in-line package (PDIP), designated as 8P3 in Microchip's ordering nomenclature. It measures 0.300" wide with 0.100" lead pitch, conforms to JEDEC MS-001 BA, and is intended for through-hole PCB assembly. The "PI" suffix explicitly denotes this PDIP variant with industrial temperature grading.

Does the AT24C02A-10PI-2.7 support page write operations?

Yes, the AT24C02A-10PI-2.7 supports 8-byte page write operations: after sending the device address and word address, the host can transmit up to eight consecutive data bytes before issuing a STOP condition. Each byte increments the internal address pointer within the same 8-byte page boundary; exceeding eight bytes causes wraparound to the start of the page. This reduces I²C transaction overhead versus individual byte writes.