Microchip Technology 24AA025E48-I/SN

Overview

24AA025E48-I/SN from Microchip Technology is a 2 Kbit I²C serial EEPROM with factory-programmed EUI-48™ node identity, 16-byte page write capability, and industrial temperature support (–40°C to +85°C). It operates from 1.7V to 5.5V, draws ≤1 µA standby current, and delivers 400 kHz I²C communication for embedded networked devices requiring unique MAC address storage.

For engineers reviewing the 24AA025E48-I/SN datasheet, 24AA025E48-I/SN pinout, 24AA025E48-I/SN application, or 24AA025E48-I/SN equivalent, key selection criteria include its cascaded multi-device I²C addressing, pre-programmed IEEE-compliant node ID, write-protection of upper memory block (0x80–0xFF), and SOIC-8/SOT-23-6 package compatibility in industrial-grade environments.

Technical Context

The 24AA025E48-I/SN implements a two-block 128 × 8-bit EEPROM array with Schmitt-triggered SDA/SCL inputs and slope-controlled outputs to suppress ground bounce. Its I²C slave interface uses a fixed 4-bit control code (1010b) plus three chip-select bits (A2/A1/A0) enabling up to eight devices on one bus - four in 6-lead SOT-23 due to A2 pin omission.

Internal logic includes a VCC threshold detector disabling write operations below 1.5V, an auto-incrementing address pointer for sequential reads, and a self-timed erase/write cycle with ACK polling support. The upper 1Kbit (0x80–0xFF) is permanently write-protected to preserve the EUI-48™ address stored at 0xFA–0xFF.

Key Specifications

Pinout & Package

24AA025E48-I/SN is available in 8-lead SOIC (SN) and 6-lead SOT-23 packages. The /I suffix denotes Industrial temperature grade; /SN specifies the narrow SOIC-8 package per JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C EEPROM with factory-programmed node identity applications.

Compared with 24AA02E48-I/SN and AT24MAC402-MAHM-T, the 24AA025E48-I/SN uniquely balances cascaded multi-device support, industrial temperature resilience, and proven field reliability in networked embedded systems - making it optimal where scalable node identity management is essential.

Availability

24AA025E48-I/SN is available at Aetrix Electronics and suitable for industrial automation, smart sensor deployment, medical diagnostics, and automotive telematics requiring stable component supply and guaranteed long-term availability.

Supply support for 24AA025E48-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, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with high-reliability semiconductor products.

The 24AA025E48-I/SN belongs to Microchip's EUI-series serial EEPROM family, designed specifically to simplify IEEE-compliant node identity management in resource-constrained embedded systems without requiring external programming infrastructure.

FAQ

What is the exact memory organization and protection scheme of the 24AA025E48-I/SN?

The 24AA025E48-I/SN contains 2 Kbit (256 bytes) of EEPROM organized as two 128-word blocks. The upper half (addresses 0x80–0xFF) is permanently write-protected to preserve the factory-programmed EUI-48™ node address stored at 0xFA–0xFF. The lower half (0x00–0x7F) is fully readable and writable. This architecture ensures identity integrity while allowing application data storage in the unprotected region - a core design feature of the 24AA025E48-I/SN.

How does the cascading capability of the 24AA025E48-I/SN work in practice?

The 24AA025E48-I/SN uses A0, A1, and A2 pins as chip-select bits in its I²C slave address, enabling up to eight devices on one bus. In the 6-lead SOT-23 package, A2 is omitted, limiting cascading to four devices. Each device responds only when its A0–A2 logic levels match the corresponding bits in the master's control byte (1010 A2 A1 A0 R/W). This allows scalable node identity management - a defining capability of the 24AA025E48-I/SN in multi-sensor networks.

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

The 24AA025E48-I/SN is rated for Industrial temperature (–40°C to +85°C), not Automotive (–40°C to +125°C). While it may function in some under-hood or cabin environments, Microchip specifies the -E variant (e.g., 24AA025E48-E/SN) for full automotive qualification. For AEC-Q100 compliance and guaranteed operation up to +125°C, the 24AA025E48-I/SN is not suitable - use the -E version instead. Always verify thermal margins in the target application before selecting the 24AA025E48-I/SN.

What is the significance of the "5-lead SOT-23" vs "6-lead SOT-23" packaging noted in the datasheet for the 24AA025E48-I/SN?

The 24AA025E48-I/SN is offered in both 6-lead SOT-23 and 8-lead SOIC packages - not 5-lead. The 5-lead SOT-23 applies only to the 24AA02E48/24AA02E64 variants, which lack A0/A1/A2 pins. The 24AA025E48-I/SN requires six leads to accommodate VCC, VSS, SDA, SCL, A0, and A1 (A2 is NC in SOT-23). This pin count difference reflects the cascading capability unique to the "25" series, confirming that the 24AA025E48-I/SN in SOT-23 uses all six terminals for functional addressing.

Does the 24AA025E48-I/SN support EUI-64™ natively, or only EUI-48™?

The 24AA025E48-I/SN is pre-programmed exclusively with an EUI-48™ (48-bit) node address stored at memory locations 0xFA–0xFF. It does not contain a native EUI-64™ address. However, the datasheet confirms that the EUI-48™ value can be encapsulated at the application level (by inserting 0xFFFE between OUI and extension bytes) to form a valid EUI-64™ identifier - a documented and supported usage mode for the 24AA025E48-I/SN in IPv6 or Zigbee 3.0 systems requiring 64-bit addressing.