Microchip Technology 24AA02T-I/MS

Overview

24AA02T-I/MS from Microchip Technology Inc. is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 1.7V to 5.5V with 400 kHz max clock frequency, 1 µA standby current, and industrial temperature range (–40°C to +85°C). It features hardware write-protection via the WP pin and is commonly used for storing calibration data, MAC addresses, and configuration settings in embedded control modules.

For engineers reviewing the 24AA02T-I/MS datasheet, 24AA02T-I/MS pinout, 24AA02T-I/MS application, or 24AA02T-I/MS equivalent, key selection considerations include its 8-byte page write buffer, Schmitt-trigger inputs for noise immunity, self-timed erase/write cycle, 1 million endurance cycles, and compatibility with standard I²C bus timing at 1.7V–5.5V supply.

Technical Context

The 24AA02T-I/MS implements a two-wire I²C interface with fixed 7-bit device address (1010xxx) and no internal A0–A2 address decoding-those pins are unconnected. Its internal architecture includes an EEPROM array, page latches, and HV generator for programming, enabling byte- and page-write operations with automatic internal timing.

It supports three read modes-current address, random, and sequential-with acknowledge polling for write-cycle completion detection. The SDA and SCL pins incorporate Schmitt triggers and input filters (50 ns spike suppression), and output slope control eliminates ground bounce during transitions.

Key Specifications

Pinout & Package

24AA02T-I/MS is supplied in an 8-lead MSOP package (Microchip package code "MS"), measuring 3.0 mm × 3.0 mm × 1.0 mm, with wettable flank option for automated optical inspection. Pin 1 is marked by a beveled corner or dot; the exposed pad is not internally connected and may be left floating or tied to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02B-I/MS, the 24AA02T-I/MS enables true low-voltage operation down to 1.7V while maintaining identical pinout and software compatibility; compared with 24FC02-I/MS, it trades 1 MHz speed and +125°C rating for lower cost and proven industrial-grade reliability.

Availability

24AA02T-I/MS is available at Aetrix Electronics and suitable for industrial sensor nodes, medical handheld diagnostics, and automotive body control modules requiring stable component supply, long-term data retention, and AEC-Q100-aligned reliability.

Supply support for 24AA02T-I/MS 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 Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24AA02T-I/MS belongs to Microchip's 24XX02 family of I²C EEPROMs, designed specifically for secure, low-power, and space-constrained nonvolatile storage in embedded systems where factory programming and write protection are essential.

FAQ

What is the exact memory organization of the 24AA02T-I/MS?

The 24AA02T-I/MS contains 256 words of 8-bit memory, arranged as a single block from address 0x00 to 0xFF. It has no internal sub-blocks or sectoring - all addresses are uniformly accessible via the I²C interface using the fixed 7-bit device address 0x50 (1010000b) and an 8-bit word address. This linear layout simplifies firmware implementation for configuration storage tasks.

Does the 24AA02T-I/MS require external pull-up resistors on SDA and SCL?

Yes, the 24AA02T-I/MS requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. For 400 kHz operation, Microchip recommends 2 kΩ pull-ups to VCC; for 100 kHz, 10 kΩ is typical. The resistor value must be selected based on bus capacitance and desired rise time - values outside the 1–10 kΩ range may cause timing violations or excessive power draw.

Can the A0, A1, and A2 pins of the 24AA02T-I/MS be used to configure the I²C address?

No - the A0, A1, and A2 pins of the 24AA02T-I/MS are not internally connected and serve no address configuration function. The device uses a fixed I²C address of 0x50 (1010000b) regardless of how these pins are terminated. This differs from larger EEPROMs like the 24AA04 or 24AA64, which use those pins for address selection.

How does write protection work on the 24AA02T-I/MS?

Write protection on the 24AA02T-I/MS is controlled solely by the WP pin: when WP is tied to VCC, all write operations (byte and page) to the entire memory array (0x00–0xFF) are inhibited; reads remain fully functional. When WP is tied to VSS or left floating (default), full read/write access is enabled. No software command or register setting affects this hardware lock.

Is the 24AA02T-I/MS qualified for automotive applications?

The 24AA02T-I/MS is rated for industrial temperature (–40°C to +85°C) and is AEC-Q100 qualified, making it suitable for automotive body electronics, infotainment peripherals, and other non-powertrain applications. However, it is not rated for the extended temperature range (–40°C to +125°C) required for under-hood use - for that, the 24FC02-I/MS variant is recommended.