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24AA512-I/SN

512Kb I2C EEPROM, 1MHz, 128B page, 1M cycles, 1.7-5.5V, SOIC-8 industrial

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Manufacturer Part：

24AA512-I/SN

Package：

SOIC-8 (3.90mm width)

Description

Product Overview

The 24AA512-I/SN from Microchip Technology is a 512Kb (64K x 8) I2C serial EEPROM with 1 MHz clock rate, byte and page write capability (128-byte pages), 1,000,000 erase/write cycles endurance, and >200 year data retention. Operating from 1.7V to 5.5V in an 8-pin SOIC package with industrial temperature range.

Key Specifications

Density: 512 Kb (64K x 8 bytes)
Interface: I2C (2-wire)
Clock Rate: 1 MHz (>2.5V), 400 kHz (1.7V)
Supply Voltage: 1.7V ~ 5.5V
Page Size: 128 bytes
Write Cycle Time: 5 ms max (byte or page)
Endurance: 1,000,000 erase/write cycles
Data Retention: >200 years
Read Current: 1 mA max (5.5V, 1 MHz)
Standby Current: 5 µA max (5.5V)
Address Pins: 3 (A0, A1, A2) for up to 8 devices on bus
Hardware Write Protect: Yes (WP pin)
Operating Temperature: -40°C ~ 85°C (I suffix)
Package: SOIC-8 (3.90mm width)
ESD Protection: 3000V HBM

Features

Low-voltage operation down to 1.7V
1 MHz I2C for fast data access
128-byte page write for efficient bulk programming
Hardware write protect for critical data regions
3 address pins for 8-device bus multiplexing
Schmitt Trigger inputs for noise immunity
100 kHz and 400 kHz backward compatible

Applications

Data logging and parameter storage
Configuration and calibration data
Serial number and asset tracking
Firmware patch storage
Display panel parameter storage

Product Introduction:24AA512-I/SN Product Introduction

The 24AA512-I/SN from Microchip Technology is a 512Kb I2C serial EEPROM providing 65,536 bytes of non-volatile storage. The 1 MHz I2C clock rate (at VCC ≥ 2.5V) enables fast read access for applications that need to retrieve large amounts of data quickly, such as font tables, calibration maps, and configuration parameters. The 128-byte page write capability allows up to 128 bytes to be written in a single write cycle, significantly improving programming throughput compared to byte-by-byte writes. The device operates from 1.7V to 5.5V, covering the full range of common logic supply voltages. The I suffix indicates industrial temperature range (-40°C to 85°C) and the SN suffix indicates SOIC-8 packaging. Three address pins (A0-A2) allow up to eight devices to share a single I2C bus, providing up to 512KB of total EEPROM storage.

Working Principle:24AA512-I/SN Working Principle

The 24AA512-I/SN uses a standard I2C protocol with 7-bit device address (1010+A2+A1+A0). Communication begins with a START condition followed by the device address byte. For random reads, the master sends a 16-bit address (two address bytes due to 64K address space), then issues a repeated START and reads data. For page writes, the master sends the starting address followed by up to 128 bytes of data; the internal address counter auto-increments within the 128-byte page boundary. If the address wraps within the page, previously written data is overwritten. The internal write cycle takes approximately 5 ms, during which the device does not acknowledge I2C transactions (polling can be used to detect completion). The WP pin, when tied to VCC, protects the upper quadrant of the memory array from write operations. The EEPROM cell uses a floating-gate transistor structure where charge is stored on an isolated polysilicon gate, providing non-volatile storage without power.

Pin Description:24AA512-I/SN Pin Definition and Functions

Pin	Name	Function
1	A0	Address input 0 (chip select)
2	A1	Address input 1 (chip select)
3	A2	Address input 2 (chip select)
4	VSS	Ground
5	SDA	Serial data input/output (open-drain)
6	SCL	Serial clock input
7	WP	Write protect (VCC=protect, GND=write enable)
8	VCC	Power supply (1.7-5.5V)

Application Scenarios:In which products and applications is24AA512-I/SN used

The 24AA512-I/SN provides non-volatile parameter storage for embedded systems that need to retain calibration data, configuration settings, and serial numbers across power cycles. In industrial controllers, it stores PID loop parameters and I/O calibration coefficients that technicians adjust during commissioning. For display panels, the 64KB capacity stores font tables and user preferences. In data logging applications, the 1 MHz read speed enables fast data retrieval while the 128-byte page write allows efficient bulk storage. The hardware write protect prevents accidental corruption of critical data regions during system crashes or power glitches.

Alternative Models:What chips are recommended as replacements for 24AA512-I/SN

Model	Manufacturer	Key Difference
24LC512-I/SN	Microchip	Same density, supports 400kHz only at 2.5V
24FC512-I/SN	Microchip	Same density, supports up to 1.7MHz
AT24C512C-SSHL-T	Microchip (Atmel)	512Kb equivalent, 1MHz, SOIC-8