Microchip Technology 24AA025E48T-I/SN

Overview

24AA025E48T-I/SN from Microchip Technology is a 2 Kbit I²C serial EEPROM with factory-programmed, globally unique EUI-48™ node address stored in write-protected memory (0xFA–0xFF), 16-byte page write buffer, and operation down to 1.7V. It supports 400 kHz I²C clock (100 kHz at VCC < 2.5V), delivers ≤1 mA active current and ≤1 µA standby current (I-temp), and is used for MAC address storage in networked embedded systems.

For engineers reviewing the 24AA025E48T-I/SN datasheet, 24AA025E48T-I/SN pinout, 24AA025E48T-I/SN application, or 24AA025E48T-I/SN equivalent, key selection criteria include guaranteed EUI-48™ uniqueness, cascading capability via A0/A1/A2 address pins, 16-byte page write efficiency, industrial temperature range (−40°C to +85°C), and SOIC-8 package compatibility with standard PCB footprints.

Technical Context

The 24AA025E48T-I/SN implements a two-block 128 × 8-bit EEPROM array with hardware write protection on upper half (0x80–0xFF). Its I²C slave interface uses Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce, enabling robust operation on electrically noisy boards.

It features cascading support via three chip-select inputs (A0, A1, A2) - allowing up to eight devices on one bus - and supports contiguous address expansion across devices by mapping A0–A2 to address bits A8–A10. Acknowledge polling enables precise timing control during self-timed 5 ms write cycles.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (SN), 3.90 mm body width, RoHS-compliant matte tin finish. Pin 1 marked with notch or dot; pin 1 = A0.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EEPROM-with-EUI applications.

Compared with 24AA02E48T-I/SN, the 24AA025E48T-I/SN adds cascading and doubles page size - critical for multi-device networks - while AT24C02C offers flexibility at the cost of certified uniqueness and out-of-box MAC readiness.

Availability

24AA025E48T-I/SN is available at Aetrix Electronics and suitable for industrial automation controllers, medical diagnostic instruments, and network infrastructure equipment requiring stable component supply across long product lifecycles.

Supply support for 24AA025E48T-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA02XEXX family was designed specifically for secure, standards-compliant node identity storage in Ethernet, USB, and IoT edge devices - prioritizing factory-programmed uniqueness, low-power operation, and I²C interoperability.

FAQ

What is the exact memory organization of the 24AA025E48T-I/SN?

The 24AA025E48T-I/SN contains 2 Kbit (256 bytes) of EEPROM organized as two 128-byte blocks. The upper half (0x80–0xFF) is permanently write-protected and holds the factory-programmed EUI-48™ address (0xFA–0xFF). The lower half (0x00–0x7F) is fully user-writable. This structure ensures MAC address integrity while reserving space for application data in the 24AA025E48T-I/SN.

Does the 24AA025E48T-I/SN support cascading, and how many devices can share one I²C bus?

Yes, the 24AA025E48T-I/SN supports cascading via its A0, A1, and A2 address pins. With all three pins used, up to eight devices can be uniquely addressed on a single I²C bus. In the 8-lead SOIC package (used by 24AA025E48T-I/SN), all three pins are functional and must be tied to VSS or VCC to set the device's 3-bit slave address - a key differentiator from the non-cascadable 24AA02E48T-I/SN.

What is the write endurance and data retention specification for the 24AA025E48T-I/SN?

The 24AA025E48T-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 through characterization (not 100% tested per unit) and apply to both the user-writable lower memory (0x00–0x7F) and the factory-programmed EUI-48™ block (0xFA–0xFF) in the 24AA025E48T-I/SN.

How does the 24AA025E48T-I/SN handle power supply variations during write operations?

The 24AA025E48T-I/SN includes an internal VCC threshold detector that disables erase/write logic if VCC drops below approximately 1.5V. This prevents partial writes and data corruption during brown-out conditions. Combined with its 1.7V–5.5V operating range and ≤1 µA standby current, this ensures robust operation in battery-backed or dynamically powered systems using the 24AA025E48T-I/SN.

Is the EUI-48™ address in the 24AA025E48T-I/SN compatible with IPv6 autoconfiguration?

Yes - the EUI-48™ address stored in the 24AA025E48T-I/SN (at 0xFA–0xFF) can be directly converted to a 64-bit IPv6 interface identifier by inserting 0xFFFE between the OUI and extension bytes (e.g., 00-04-A3-12-34-56 → 00-04-A3-FF-FE-12-34-56). This encapsulation method is IEEE-standard and supported in common network stacks, enabling stateless address autoconfiguration (SLAAC) without requiring the larger 24AA025E64 variant.