Microchip Technology 24AA025E48T-E/SN

Overview

24AA025E48T-E/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with factory-programmed EUI-48™ node identity, 16-byte page write buffer, and extended temperature operation (–40°C to +125°C). It operates down to 1.7 V, draws ≤1 mA active current and ≤5 µA standby current, and supports 400 kHz clock rates for embedded network identification in automotive and industrial systems.

For engineers reviewing the 24AA025E48T-E/SN datasheet, 24AA025E48T-E/SN pinout, 24AA025E48T-E/SN application, or 24AA025E48T-E/SN equivalent, key selection criteria include EUI-48™ address persistence, cascading capability via A0/A1/A2 pins, 16-byte page write efficiency, and automotive-grade reliability under 125°C ambient conditions.

Technical Context

The 24AA025E48T-E/SN implements a two-block 128 × 8-bit memory architecture with hardware write protection on upper half (0x80–0xFF), enabling secure storage of pre-programmed IEEE EUI-48™ addresses at fixed offsets 0xFA–0xFF. Its I²C slave interface uses Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce on noisy automotive buses.

Unlike the 24AA02E48 variant, this part supports cascading via three chip-select inputs (A0, A1, A2), allowing up to eight devices on one bus (four in 6-lead SOT-23), with contiguous addressing expansion to 16 Kbits. The internal address pointer auto-increments during sequential reads and page writes, and acknowledge polling enables precise timing control of 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 by notch or dot; pin 1 = A0 (chip select input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02E48T-E/SN, the 24AA025E48T-E/SN adds cascading and larger page buffer at no cost to voltage range or temperature rating; versus AT24MAC402-MAHM-T, it offers hardware-addressable multi-drop capability essential for modular sensor networks.

Availability

24AA025E48T-E/SN is available at Aetrix Electronics and suitable for automotive telematics, industrial Ethernet nodes, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

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

The 24AA02XEXX family was designed specifically to deliver factory-programmed IEEE node identity in compact, automotive-qualified EEPROMs - solving MAC address management, traceability, and secure boot requirements in resource-constrained edge devices.

FAQ

What is the exact memory organization and address map of the 24AA025E48T-E/SN?

The 24AA025E48T-E/SN contains 2 Kbit (256 bytes) of EEPROM organized as two 128-word blocks. Addresses 0x00–0x7F are user-writable; 0x80–0xFF are write-protected and hold the pre-programmed EUI-48™ address at 0xFA–0xFF. The 24AA025E48T-E/SN uses this exact layout per DS20002124H, with no variation across temperature grades or packages.

Does the 24AA025E48T-E/SN support I²C clock stretching or multi-master arbitration?

No - the 24AA025E48T-E/SN does not implement clock stretching and is strictly a slave device with no arbitration capability. It relies on master-controlled timing per standard I²C protocol, and its acknowledge polling mechanism (Section 7.0) is the only method to detect write completion. This behavior is consistent across all 24AA02XEXX variants including the 24AA025E48T-E/SN.

How is the EUI-48™ address accessed and verified in-system for the 24AA025E48T-E/SN?

The EUI-48™ address resides at fixed memory locations 0xFA through 0xFF and is read using standard I²C random-read or sequential-read commands. Since the upper half is write-protected, the address remains immutable after factory programming. Verification is performed by reading those six bytes and confirming IEEE OUI alignment (first three bytes assigned to Microchip); this process is identical for every 24AA025E48T-E/SN unit shipped.

Can the 24AA025E48T-E/SN be used in a 1.8 V system with 400 kHz I²C operation?

Yes - the 24AA025E48T-E/SN supports full 400 kHz I²C operation at VCC = 1.8 V, as confirmed by Table 1-2 (FCLK = 400 kHz for VCC ≥2.5 V) and footnote 1 (100 kHz for VCC <2.5 V). However, at 1.8 V, maximum clock frequency is 100 kHz. For 400 kHz operation, VCC must be ≥2.5 V. This specification applies identically to the 24AA025E48T-E/SN across all packages and temperature grades.

What is the function of the NC pin on the 24AA025E48T-E/SN SOIC package?

The NC (No Connect) pin on the 24AA025E48T-E/SN 8-lead SOIC package is internally unconnected and serves no electrical function. It must remain floating - no external tie to VCC, VSS, or other signals is permitted or required. This pin assignment is fixed per Microchip Drawing No. C04-057-SN Rev D and applies exclusively to the SN package variant of the 24AA025E48T-E/SN.