Overview
The 24AA025UID-I/SN is a 2-Kbit I2C serial EEPROM memory device manufactured by Microchip Technology. It features a wide voltage range (2.5V to 5.5V) making it suitable for various embedded applications. The device includes a factory-programmed 128-bit serial number that provides unique identification capabilities, particularly valuable for IoT and networked devices. This memory chip comes in an 8-lead SN (plastic small outline) package, measuring just 3.00mm × 4.90mm, ideal for space-constrained designs. With its 1 million erase/write cycle endurance and 200-year data retention, it offers reliable non-volatile storage for critical system parameters and configuration data.
Structure and Working Principle
The 24AA025UID-I/SN consists of a memory array organized as 256 × 8 bits, accessed through a simple two-wire I2C interface (SCL and SDA). The device operates as a slave in the I2C system, supporting standard (100 kHz) and fast (400 kHz) modes. The 128-bit unique identifier is stored in a separate, read-only memory section. Internally, the chip contains address latches and decoders, control circuitry, and the memory array. Write operations are self-timed, and the device includes write-protect features via a dedicated pin (WP). The memory cells use floating gate technology to maintain data without power, with built-in error correction for reliability.
Key Features
The 24AA025UID-I/SN's most notable feature is its factory-programmed 128-bit serial number, which provides guaranteed unique identification for each device. This is particularly valuable for applications requiring secure device authentication or tracking. The wide voltage range allows operation in diverse systems without level shifting. Additional features include software write protection, hardware write protection via the WP pin, and sequential read capability for efficient data access. The device operates across industrial temperature ranges (-40°C to +85°C), making it suitable for harsh environments. Low power consumption (standby current typically 1 µA) benefits battery-powered applications.
Application Areas
This EEPROM is widely used in industrial control systems for storing calibration data, device parameters, and operational logs. In automotive applications, it serves for ECU configuration and vehicle identification. Consumer electronics utilize it in smart appliances, set-top boxes, and gaming peripherals. The unique serial number enables important IoT applications including secure device provisioning, anti-counterfeiting measures, and asset tracking. Medical devices use these chips for storing calibration data and usage logs. Networking equipment employs them for MAC address storage and board identification in modular systems.
Maintenance and Precautions
When handling the 24AA025UID-I/SN, standard ESD precautions should be observed as with all semiconductor devices. The I2C lines should be properly terminated to prevent signal reflections, with pull-up resistors sized according to bus speed and capacitance. The WP pin should be connected to VSS or properly driven to prevent accidental writes. In system design, ensure the power supply remains within specified limits during write operations. Avoid exceeding the maximum write cycle rating by implementing wear-leveling algorithms for frequently changed data. For firmware updates, verify successful writes by implementing read-back verification routines.
B2B Procurement Guide
When sourcing 24AA025UID-I/SN chips, verify authenticity by purchasing directly from Microchip or authorized distributors to avoid counterfeit components. Lead times typically range from 4-8 weeks, so plan procurement accordingly. Volume pricing breaks usually occur at 1k, 5k, and 10k unit quantities. For new designs, consider ordering evaluation boards or samples for testing. Confirm required certifications (AEC-Q100 for automotive, for example) if applicable to your application. Check for alternative packaging options (tape and reel) if automated assembly is planned. Maintain communication with suppliers about potential obsolescence or product change notifications.
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