Microchip Technology 24AA02E48-E/SN

Overview

24AA02E48-E/SN 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 400 kHz I²C clock (100 kHz at VCC <2.5V), and delivers ≤1 µA standby current (I-temp) for low-power embedded identity storage. It is used in networked IoT edge nodes requiring IEEE-compliant MAC address persistence across power cycles.

For engineers reviewing the 24AA02E48-E/SN datasheet, 24AA02E48-E/SN pinout, 24AA02E48-E/SN application, or 24AA02E48-E/SN equivalent, this page provides verified electrical specs, SOIC-8 package layout, EUI-48™ memory mapping, I²C timing constraints, and validated alternatives for secure device identity implementation in industrial and automotive systems.

Technical Context

The 24AA02E48-E/SN 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™ resides. Its I²C slave interface uses Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce on shared buses.

It features an 8-byte page write buffer, self-timed erase/write cycle (5 ms max), and acknowledge polling support for bus efficiency. No A0/A1/A2 address pins are present - device addressing uses fixed 4-bit control code '1010' followed by R/W bit only, making it non-cascadable and simplifying multi-device I²C topology design.

Key Specifications

Pinout & Package

24AA02E48-E/SN is supplied in an 8-lead SOIC (SN) package, 3.90 mm body width, RoHS-compliant matte tin finish. Pin 1 is marked with a beveled corner or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02E48-E/SN, the 24AA02E64-E/SN provides native EUI-64™ support for IPv6-ready systems, while AT24MAC402-MAHM-T offers AEC-Q200 Grade 1 qualification for harsher automotive environments - both retain identical memory organization, I²C interface behavior, and SOIC-8 mechanical compatibility.

Availability

24AA02E48-E/SN is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical handheld devices requiring stable component supply, long-term data integrity, and IEEE-compliant device identity.

Supply support for 24AA02E48-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The 24AA02E48-E/SN belongs to Microchip's "MAC Address EEPROM" product line, designed specifically to embed IEEE-standardized node identities into resource-constrained embedded systems without firmware provisioning overhead.

FAQ

What is the exact memory layout of the EUI-48™ address in 24AA02E48-E/SN?

The EUI-48™ address is factory-programmed and permanently write-protected in the upper half of the 24AA02E48-E/SN memory array, specifically at byte addresses 0xFA through 0xFF. These six bytes contain the IEEE-assigned OUI (first three bytes) and Microchip-generated extension identifier (last three bytes), forming a globally unique 48-bit MAC address readable via standard I²C random-read commands.

Does 24AA02E48-E/SN support cascading multiple devices on the same I²C bus?

No, 24AA02E48-E/SN does not support cascading. Its A0, A1, and A2 pins are unconnected and unused; device addressing relies solely on the fixed 4-bit control code '1010' and R/W bit, resulting in a single hardwired slave address (0x50). To connect multiple identity EEPROMs, use variants like 24AA025E48-E/SN which implement A0–A2 address inputs.

What is the maximum I²C clock frequency supported by 24AA02E48-E/SN?

The 24AA02E48-E/SN supports up to 400 kHz I²C clock frequency when VCC is ≥2.5V. At supply voltages below 2.5V (down to 1.7V), the maximum clock frequency is reduced to 100 kHz to ensure reliable timing margins - this is enforced by internal voltage detection and does not require firmware intervention.

Can the user area (0x00–0x7F) of 24AA02E48-E/SN be written during normal operation?

Yes, the lower 128 bytes (0x00–0x7F) of 24AA02E48-E/SN are fully read/write enabled and support standard I²C byte and page write operations. Only the upper 128 bytes (0x80–0xFF), containing the EUI-48™ address, are hardware write-protected - no software command or voltage condition can override this protection.

Is 24AA02E48-E/SN qualified for automotive applications?

The -E suffix in 24AA02E48-E/SN denotes Automotive qualification (–40°C to +125°C), and the part meets AEC-Q100 Grade 2 requirements. It is suitable for body electronics, infotainment interfaces, and ADAS auxiliary modules where extended temperature operation and long-term reliability are mandated - though full AEC-Q100 test reports must be obtained from Microchip for certification documentation.