Microchip Technology 24AA02-I/MS

Overview

24AA02-I/MS from Microchip Technology 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, 8-byte page write buffer, and Schmitt-trigger inputs for noise immunity-used in embedded system configuration storage and device identity retention.

For engineers reviewing the 24AA02-I/MS datasheet, 24AA02-I/MS pinout, 24AA02-I/MS application, or 24AA02-I/MS equivalent, this page delivers verified electrical specs, package mapping to MSOP-8, I²C timing compliance at 1.7V–5.5V, endurance (1M cycles), and real-world use cases including secure MAC address storage and calibration data retention in industrial sensors.

Technical Context

The 24AA02-I/MS implements a two-wire I²C interface with fixed 7-bit slave address (1010xxx) and R/W bit control, supporting byte and page write modes with self-timed erase/write cycles. Its internal Address Pointer enables current-address, random, and sequential read operations without external address latching.

It integrates Schmitt-trigger inputs on SDA/SCL for noise suppression, output slope control to minimize ground bounce, and a dedicated Write-Protect (WP) pin that disables all write operations when pulled high-enabling hardware-level data integrity assurance during power-up or firmware updates.

Key Specifications

Pinout & Package

24AA02-I/MS is packaged in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm pitch, 3.0 mm × 3.0 mm body size, and exposed pad option (not electrically connected). Pin 1 is marked by a beveled corner or dot; A0–A2 are no-connect pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02-I/MS, the 24LC02B-I/MS lacks 1.7V compatibility but offers identical packaging and interface; the AT24C02C-MAHM-T provides second-source assurance with matching electrical behavior and qualification-making it ideal for long-term production continuity.

Availability

24AA02-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded device identity management, and secure boot key storage requiring stable component supply across multi-year production cycles.

Supply support for 24AA02-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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA02-I/MS belongs to Microchip's 24XX02 family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space- and power-constrained embedded systems across industrial, automotive, and consumer applications.

FAQ

What is the maximum I²C clock frequency supported by the 24AA02-I/MS?

The 24AA02-I/MS supports up to 400 kHz when VCC is 2.5V or higher. At supply voltages between 1.7V and 2.5V, the maximum clock frequency is reduced to 100 kHz to maintain timing margin. This dual-speed capability ensures interoperability with both legacy 100 kHz I²C masters and modern high-speed controllers while preserving reliability across the full 1.7–5.5V operating range of the 24AA02-I/MS.

Can the 24AA02-I/MS be used in 1.8V systems?

Yes, the 24AA02-I/MS is fully specified for operation down to 1.7V, making it compatible with standard 1.8V logic families. It maintains full I²C functionality-including 100 kHz clock support, 1 µA standby current, and Schmitt-trigger noise immunity-at 1.8V. This eliminates the need for level shifters when interfacing with 1.8V microcontrollers, simplifying design and reducing BOM cost for the 24AA02-I/MS.

How does the Write-Protect (WP) pin function on the 24AA02-I/MS?

On the 24AA02-I/MS, the WP pin is an active-high hardware lock: when tied to VCC, all write operations (byte and page) to the entire 256-byte memory array are inhibited, while read operations remain fully functional. When tied to VSS or left floating, normal read/write access is enabled. This feature allows permanent or runtime protection of critical data such as MAC addresses or calibration constants without software intervention.

What is the endurance and data retention specification for the 24AA02-I/MS?

The 24AA02-I/MS guarantees 1,000,000 erase/write cycles and greater than 200 years of data retention at 25°C - both validated under worst-case conditions (5.5V, 85°C). These specifications apply to the full memory array and are not degraded by partial-page writes or mixed read/write workloads, ensuring long-term reliability for the 24AA02-I/MS in unattended infrastructure monitoring and automotive control modules.

Is the 24AA02-I/MS pin-compatible with other 24XX02 family members in MSOP-8 packaging?

Yes, the 24AA02-I/MS shares identical pinout, footprint, and electrical interface with all MSOP-8 variants in the 24XX02 family-including 24LC02B-I/MS and 24FC02-I/MS. A0–A2 are no-connect pins; VSS, SDA, SCL, WP, and VCC occupy the same positions across all variants. However, voltage range and maximum clock frequency differ, so system-level validation is required when substituting the 24AA02-I/MS for another variant.