Microchip Technology 24AA025E48-E/SN

Overview

24AA025E48-E/SN from Microchip Technology is a 2 Kbit I²C serial EEPROM with factory-programmed EUI-48™ node identity, 16-byte page write capability, and operation down to 1.7V. It delivers ≤1 µA standby current (I-temp), supports 400 kHz I²C clock (100 kHz at VCC <2.5V), and features Schmitt-trigger inputs for noise immunity in industrial networking and embedded device identification applications.

For engineers reviewing the 24AA025E48-E/SN datasheet, 24AA025E48-E/SN pinout, 24AA025E48-E/SN application, or 24AA025E48-E/SN equivalent, key selection criteria include its cascading capability via A0–A2 address pins, permanent upper-half memory write protection (0x80–0xFF), EUI-48™ address location at 0xFA–0xFF, and SOIC-8 package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The 24AA025E48-E/SN implements a two-block 128 × 8-bit EEPROM array with I²C-compatible 2-wire interface, supporting byte and 16-byte page writes. Its internal address pointer auto-increments during sequential reads, and it uses a VCC threshold detector to disable erase/write below 1.5V.

It features cascading support via three hardware address pins (A0, A1, A2) enabling up to eight devices on one bus (four in 6-lead SOT-23), and includes dedicated write-protection logic that permanently locks addresses 0x80–0xFF-where the pre-programmed EUI-48™ resides-while leaving 0x00–0x7F freely writable for user data.

Key Specifications

Pinout & Package

24AA025E48-E/SN is supplied in an 8-lead SOIC (SN) package per JEDEC MS-012, with 3.90 mm body width and standard 1.27 mm lead pitch. Pin 1 is marked by a beveled corner or dot.

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 24AA02E48-I/SN, the 24AA025E48-E/SN adds cascading flexibility and larger page buffer, while versus AT24CM02-SSHM-T it delivers out-of-box IEEE-compliant identity-reducing qualification time and eliminating field provisioning risk.

Availability

24AA025E48-E/SN is available at Aetrix Electronics and suitable for industrial networking, IoT edge authentication, medical device UDI tagging, and embedded calibration storage requiring stable component supply across extended product lifecycles.

Supply support for 24AA025E48-E/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 24AA025E48-E/SN belongs to Microchip's 24AA02XEXX family of identity EEPROMs, designed specifically to simplify IEEE-compliant device identification in industrial, automotive, and medical systems without host processor overhead.

FAQ

What is the exact memory organization of the 24AA025E48-E/SN?

The 24AA025E48-E/SN contains 2 Kbit (256 bytes) of EEPROM arranged as two 128-word blocks. Addresses 0x00–0x7F are user-writable; 0x80–0xFF are permanently write-protected and hold the pre-programmed EUI-48™ at 0xFA–0xFF. This structure ensures identity integrity while reserving 128 bytes for application data storage in the 24AA025E48-E/SN.

Does the 24AA025E48-E/SN support I²C clock stretching or multi-master arbitration?

No, the 24AA025E48-E/SN does not implement clock stretching or multi-master arbitration logic. It operates strictly as an I²C slave device with fixed timing parameters per DS20002124H. The master must fully control SCL and manage bus arbitration externally. This simplifies integration but requires the host controller to handle timing compliance and collision avoidance for the 24AA025E48-E/SN.

How is the EUI-48™ address accessed in the 24AA025E48-E/SN?

The EUI-48™ address is stored at fixed memory locations 0xFA through 0xFF and is read using standard I²C random-read protocol: send start + control byte (0xA0) + word address 0xFA + repeated start + control byte (0xA1) + read six bytes. No special command is needed-the 24AA025E48-E/SN returns the factory-programmed value directly from those addresses.

Can the 24AA025E48-E/SN be used in automotive applications?

The 24AA025E48-E/SN variant is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). For automotive use, Microchip offers the 24AA025E48-E/MNY (E-temp grade) in SOT-23-6 or 24AA025E48-E/MS (SOIC-8). The 24AA025E48-E/SN itself is qualified only for industrial environments and must not be deployed in under-hood automotive systems.

What happens if a page write crosses a 16-byte boundary in the 24AA025E48-E/SN?

If a page write command attempts to write across a 16-byte physical page boundary (e.g., starting at 0x0F and writing 16 bytes), the address counter wraps around to the start of the same page (0x00), overwriting previously loaded data in that page. The 24AA025E48-E/SN does not auto-advance to the next page-software must enforce alignment to prevent unintended data loss during page writes.