Microchip Technology 24AA025E64T-I/OT

Overview

24AA025E64T-I/OT from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with factory-programmed, globally unique EUI-64™ node address stored in write-protected memory (0xF8–0xFF). It operates from 1.7V to 5.5V, supports 400 kHz I²C clock (100 kHz below 2.5V), and features 16-byte page write capability. Used for secure device identity storage in networked embedded systems.

For engineers reviewing the 24AA025E64T-I/OT datasheet, 24AA025E64T-I/OT pinout, 24AA025E64T-I/OT application, or 24AA025E64T-I/OT equivalent, key selection criteria include guaranteed EUI-64™ uniqueness, industrial temperature range (−40°C to +85°C), 6-lead SOT-23 package compatibility, and cascading support for multi-device I²C bus topology.

Technical Context

The 24AA025E64T-I/OT implements a two-wire I²C slave interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes a 16-byte page buffer, address pointer auto-increment logic, and hardware write protection for the upper 128 bytes (0x80–0xFF), where the EUI-64™ address resides.

It uses a high-voltage generator and EEPROM array control logic to execute self-timed erase/write cycles. The device supports acknowledge polling to detect write completion and requires no external timing components - all timing is derived from the I²C clock (SCL) and VCC-dependent AC specifications.

Key Specifications

Pinout & Package

Package: 6-lead SOT-23 (JEDEC MO-178AA), 1.6 mm × 2.8 mm footprint, 0.95 mm height, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM with pre-programmed node identity applications.

Compared with 24AA02E64T-I/OT and AT24MAC402-MAHM-T, the 24AA025E64T-I/OT uniquely combines cascading capability (via A0/A1), EUI-64™ native support, and SOT-23 packaging - enabling scalable, compact, and standards-compliant identity management in space-constrained industrial designs.

Availability

24AA025E64T-I/OT is available at Aetrix Electronics and suitable for IoT edge node identity, industrial Ethernet device ID, medical device serial numbering, and automotive telematics module ID requiring stable component supply across long-lifecycle programs.

Supply support for 24AA025E64T-I/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, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with high-reliability silicon and development tools.

The 24AA02XEXX product line delivers factory-programmed, standards-compliant node identity storage for secure device onboarding and MAC address management in resource-constrained embedded systems.

FAQ

What is the exact memory organization and address map of the 24AA025E64T-I/OT?

The 24AA025E64T-I/OT contains 256 bytes (2 Kbit) organized as 256 × 8-bit. Addresses 0x00–0x7F are user-writable EEPROM; addresses 0x80–0xFF are write-protected and hold the factory-programmed EUI-64™ address (0xF8–0xFF). The upper half cannot be modified under any condition - this hardware lock ensures MAC address integrity across the device lifetime.

Does the 24AA025E64T-I/OT support I²C clock stretching or multi-master arbitration?

No, the 24AA025E64T-I/OT does not support clock stretching or multi-master arbitration. It operates strictly as an I²C slave with fixed timing parameters. The device relies on the master to manage bus arbitration and timing compliance per I²C specification - confirmed by absence of clock-stretching behavior in DS20002124H AC timing tables and functional description.

How is the EUI-64™ address validated and guaranteed unique for each 24AA025E64T-I/OT unit?

Each 24AA025E64T-I/OT receives a globally unique EUI-64™ address programmed at Microchip's factory using IEEE-assigned OUIs and proprietary extension algorithms. Uniqueness is ensured by serialization infrastructure and verified during final test. The address is stored in write-protected memory (0xF8–0xFF) and cannot be altered post-manufacture - documented in Section 9.2 of DS20002124H.

Can the 24AA025E64T-I/OT be used in automotive applications requiring AEC-Q200 qualification?

No, the 24AA025E64T-I/OT is rated for Industrial temperature range (−40°C to +85°C) only and is not AEC-Q200 qualified. For automotive use, Microchip offers the 24AA025E64T-E/OT variant (E-temp, −40°C to +125°C), which is AEC-Q200 Grade 2 qualified - confirmed by Device Selection Table and Packaging Information sections in DS20002124H.

What are the I²C slave address options for the 24AA025E64T-I/OT, and how are they configured?

The 24AA025E64T-I/OT uses a base I²C address of 0x50. Pins A0 and A1 set the LSBs: A1:A0 = 00 → 0x50, 01 → 0x51, 10 → 0x52, 11 → 0x53. A2 is not bonded in the 6-lead SOT-23 package and must be treated as logic '0' - enabling up to four devices on one bus. This configuration is defined in Section 5.0 and Table 2-1 of DS20002124H.