Microchip Technology 24AA024-I/SN

Overview

24AA024-I/SN 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 hardware write-protection via the WP pin, 400 kHz max clock (100 kHz below 2.5V), and industrial temperature range (–40°C to +85°C). It supports up to eight devices on one bus and is used for secure parameter storage in embedded controllers, sensor calibration data retention, and configuration backup in power-sensitive IoT edge nodes.

For engineers reviewing the 24AA024-I/SN datasheet, 24AA024-I/SN pinout, 24AA024-I/SN application, or 24AA024-I/SN equivalent, key selection criteria include its 1.7V minimum VCC, integrated hardware write-protect, 16-byte page buffer, Schmitt-trigger noise immunity on SDA/SCL, and compatibility with standard I²C master timing budgets at both 100 kHz and 400 kHz.

Technical Context

The 24AA024-I/SN implements a true 2-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A0–A2), enabling up to eight devices on a shared bus. Its internal address pointer auto-increments during sequential reads and wraps from 0xFF to 0x00.

It features a dedicated hardware write-protect (WP) pin tied to VCC/VSS - when asserted high, it disables all write operations across the full 256-byte array. The device uses low-power CMOS with typical standby current of 1 μA and active read current of 1 mA, and includes Schmitt-trigger inputs plus input filtering (50 ns spike suppression) for robust operation in electrically noisy environments.

Key Specifications

Pinout & Package

24AA024-I/SN is supplied in an 8-pin SOIC (3.90 mm) package (SOIC-8), with lead finish Pb-free and RoHS compliant. Pin 1 is marked by laser dot; pin numbering follows standard SOIC convention (counterclockwise from notch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC024-I/SN, the 24AA024-I/SN enables lower-voltage operation and shares identical packaging and pinout, while AT24C02C-SSHM-T trades hardware write-protection for software control - making 24AA024-I/SN optimal for safety-critical or ultra-low-VCC designs where deterministic hardware-enforced protection is mandatory.

Availability

24AA024-I/SN is available at Aetrix Electronics and suitable for embedded controller configuration storage, smart sensor calibration data retention, and IoT edge node identity management requiring stable component supply across extended production lifecycles.

Supply support for 24AA024-I/SN 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 24AA024-I/SN belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in cost-sensitive industrial and consumer applications.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA024-I/SN?

The 24AA024-I/SN operates reliably from 1.7V to 5.5V. Below 2.5V, maximum I²C clock frequency is limited to 100 kHz to ensure timing compliance. Internal voltage detection disables write operations if VCC falls below 1.5V nominal, preventing corrupted data writes during brown-out conditions - a critical safeguard for systems powered by batteries or unregulated supplies.

Does the 24AA024-I/SN support page write operations, and what is the buffer size?

Yes, the 24AA024-I/SN supports page write operations with a 16-byte on-chip buffer. This allows up to 16 sequential bytes to be loaded into the buffer before initiating the internal self-timed write cycle (max 5 ms). Page writes reduce I²C bus transactions significantly compared to byte writes, improving system throughput - especially valuable in resource-constrained microcontroller applications where bus bandwidth is limited.

How does the WP pin function on the 24AA024-I/SN, and is it present on all packages?

The WP (Write-Protect) pin on the 24AA024-I/SN is a hardware-enable input: tying it to VCC disables all write operations to the entire 256-byte memory array, while grounding it enables full read/write access. This pin is present on all 8-pin packages (PDIP, SOIC, TSSOP, MSOP, DFN, TDFN) but is not internally connected in the 6-lead SOT-23 variant - confirming that 24AA024-I/SN (SOIC-8) fully supports hardware write protection.

What is the endurance and data retention specification for the 24AA024-I/SN?

The 24AA024-I/SN is rated for more than 1 million erase/write cycles and guarantees data retention exceeding 200 years at +25°C. These specifications are validated under standard test conditions (25°C, VCC = 5.5V, block-mode cycling) and reflect actual characterization data - not extrapolated estimates. Endurance remains robust across the full industrial temperature range (–40°C to +85°C), making it suitable for applications requiring frequent field updates.

Can multiple 24AA024-I/SN devices be connected to the same I²C bus, and how is addressing managed?

Yes, up to eight 24AA024-I/SN devices can be cascaded on a single I²C bus using the three hardware address pins A0, A1, and A2. Each device's 7-bit slave address is formed as '1010' + A2A1A0, allowing unique addressing without software configuration. The SOIC-8 package exposes all three pins, enabling full 3-bit address selection - essential for modular systems like multi-sensor nodes or distributed I/O modules where each unit requires independent nonvolatile storage.