Microchip Technology 24AA02E48T-E/OT

Overview

24AA02E48T-E/OT from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with factory-programmed, globally unique EUI-48™ node address stored in write-protected memory (0xFA–0xFF). It operates from 1.7V to 5.5V, supports 100 kHz/400 kHz clock rates, and delivers ≤1 µA standby current (I-temp) for secure device identification in networked embedded systems.

For engineers reviewing the 24AA02E48T-E/OT datasheet, 24AA02E48T-E/OT pinout, 24AA02E48T-E/OT application, or 24AA02E48T-E/OT equivalent, this page provides verified package mapping (SOT-23-5), confirmed I²C timing compliance (THIGH ≥600 ns @400 kHz), EUI-48™ memory layout (0xFA–0xFF), and validated alternatives for industrial Ethernet node identity solutions.

Technical Context

The 24AA02E48T-E/OT implements a two-block 128 × 8-bit EEPROM array with hardware-enforced write protection on upper half (0x80–0xFF), where the pre-programmed EUI-48™ address resides. Its I²C slave interface uses Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce.

It features an 8-byte page write buffer, self-timed erase/write cycles (typ. 3 ms), and acknowledge polling support-enabling deterministic bus arbitration during write completion detection. No A0/A1/A2 pins are present; device addressing uses fixed 4-bit control code '1010' with R/W bit only.

Key Specifications

Pinout & Package

Package: 5-lead SOT-23 (JEDEC MO-178AA), 1.6 mm × 2.9 mm footprint, 0.95 mm height, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02E48-I/OT, the 24AA02E48T-E/OT offers extended temperature operation critical for automotive and harsh industrial environments, while AT24MAC402-MAHM-T provides stronger ESD protection and MAC-lock security - making it better suited for safety-critical or high-reliability deployments despite requiring minor firmware review.

Availability

24AA02E48T-E/OT is available at Aetrix Electronics and suitable for industrial Ethernet node identity, secure boot configuration storage, IoT sensor node authentication, and medical device UDI compliance requiring stable component supply across long-lifecycle programs.

Supply support for 24AA02E48T-E/OT 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 devices, and memory solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software platforms.

The 24AA02E48T-E/OT belongs to Microchip's "Pre-Programmed Identity EEPROM" product line, designed specifically to simplify device identification, secure boot, and regulatory compliance in resource-constrained embedded systems.

FAQ

What is the exact memory organization and EUI-48™ address location for the 24AA02E48T-E/OT?

The 24AA02E48T-E/OT contains 2 Kbit (256 bytes) of EEPROM organized as two 128-byte blocks. Its factory-programmed EUI-48™ address occupies memory locations 0xFA through 0xFF (6 bytes), and this region is permanently write-protected. The remaining 128 bytes (0x00–0x7F) are user-accessible for application data storage. This layout is fixed and identical across all 24AA02E48T-E/OT units.

Does the 24AA02E48T-E/OT support I²C clock stretching or multi-master arbitration?

No, the 24AA02E48T-E/OT does not support clock stretching. It is a pure slave device that relies on the master to control SCL timing. Multi-master arbitration is handled entirely by the I²C bus protocol at the physical layer; the 24AA02E48T-E/OT participates passively as a slave and does not initiate arbitration. Its design assumes a single master per bus segment, consistent with typical embedded identity EEPROM use cases.

Can the EUI-48™ address in the 24AA02E48T-E/OT be overwritten or reprogrammed?

No, the EUI-48™ address stored at 0xFA–0xFF in the 24AA02E48T-E/OT is permanently write-protected at the silicon level. Attempts to write to this region will be ignored. Only the lower 128 bytes (0x00–0x7F) are writable. This hardware-enforced protection ensures the uniqueness and immutability of the node identity - a core requirement for standards-compliant device identification.

What are the valid I²C slave addresses for the 24AA02E48T-E/OT?

The 24AA02E48T-E/OT uses a fixed 7-bit I²C slave address of 0x50 (0b1010000) for write operations and 0x51 (0b1010001) for read operations. Unlike variants with A0/A1/A2 pins, this part has no chip-select inputs - its address is hardwired and cannot be changed. Up to eight devices require different part numbers (e.g., 24AA025E48) with address pins.

How is the 24AA02E48T-E/OT's automotive temperature rating validated and what test conditions apply?

The 24AA02E48T-E/OT is qualified for Automotive (E-temp) operation from -40°C to +125°C per AEC-Q100 stress testing. Its electrical specifications - including 1 µA max standby current and 400 kHz I²C timing - are guaranteed across this full range. The 'E' suffix in the part number explicitly denotes this qualification, and the device undergoes temperature cycling, HTOL, and ESD testing per automotive reliability standards before release.