Microchip Technology 24AA02E64-I/SN

Overview

24AA02E64-I/SN 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 delivers ≤1 µA standby current (I-temp) for low-power embedded identity storage in networked devices.

For engineers reviewing the 24AA02E64-I/SN datasheet, 24AA02E64-I/SN pinout, 24AA02E64-I/SN application, or 24AA02E64-I/SN equivalent, this page provides verified electrical specs, SOIC-8 package layout, EUI-64™ memory mapping, I²C timing compliance, and industrial-temperature operation details required for secure device identification in IoT edge nodes and industrial controllers.

Technical Context

The 24AA02E64-I/SN implements a two-block 128 × 8-bit EEPROM array with fixed 8-byte page write capability and permanent write protection on upper half (0x80–0xFF). Its I²C slave interface uses Schmitt-trigger SDA/SCL inputs with 50 ns spike suppression and slope-controlled outputs to eliminate ground bounce.

It features an internal VCC threshold detector disabling write logic below 1.5V, supports acknowledge polling during self-timed 5 ms write cycles, and uses a fixed 1010xxxx control code where A0–A2 are "don't care" bits-eliminating external address pins and simplifying bus topology versus cascaded variants.

Key Specifications

Pinout & Package

8-lead SOIC (SN) package, 3.90 mm body width, RoHS-compliant matte tin finish. Pin 1 = NC, Pin 2 = NC, Pin 3 = NC, Pin 4 = VSS, Pin 5 = SDA, Pin 6 = SCL, Pin 7 = NC, Pin 8 = VCC. A0/A1/A2 pins are unconnected and unused.

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 24AA02E64-I/SN delivers native EUI-64™ support eliminating software overhead, while AT24MAC402-MAHM-T offers higher clock speed at the cost of package incompatibility-making 24AA02E64-I/SN optimal for drop-in EUI-64™ identity in existing SOIC-8 designs.

Availability

24AA02E64-I/SN is available at Aetrix Electronics and suitable for industrial automation, IoT edge node deployment, medical device serialization, and automotive telematics requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for 24AA02E64-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA02E64-I/SN belongs to Microchip's serial EEPROM family designed specifically for secure, factory-programmed device identity in networked electronics-enabling standards-compliant MAC addressing without MCU resource overhead.

FAQ

What is the exact memory organization and protected address range of the 24AA02E64-I/SN?

The 24AA02E64-I/SN contains 256 bytes (2 Kbit) organized as two 128-byte blocks. The upper half (addresses 0x80–0xFF) is permanently write-protected and holds the factory-programmed EUI-64™ node address (0xF8–0xFF). The lower half (0x00–0x7F) is user-writable for application data. This layout ensures identity integrity while allowing flexible use of remaining memory in the 24AA02E64-I/SN.

Does the 24AA02E64-I/SN require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA02E64-I/SN requires external pull-up resistors on both SDA and SCL because it uses open-drain outputs. For 400 kHz operation, a 2 kΩ resistor is recommended; for 100 kHz, a 10 kΩ resistor is typical. These values ensure proper rise times per I²C specification and prevent bus contention. Pull-ups must connect to the same VCC rail as the 24AA02E64-I/SN to maintain voltage-level compatibility.

How is the EUI-64™ address physically stored and accessed in the 24AA02E64-I/SN?

The EUI-64™ address is factory-programmed into memory locations 0xF8 through 0xFF (eight consecutive bytes) and resides in the write-protected upper block. It is read using standard I²C random or sequential read commands-no special protocol is required. Because the 24AA02E64-I/SN uses a fixed 1010xxxx slave address with A0–A2 as "don't care," access is simplified: send start → control byte (10100000) → word address 0xF8 → repeated start → control byte (10100001) → read eight bytes. This direct mapping is built into the 24AA02E64-I/SN design.

Can the 24AA02E64-I/SN operate reliably at 1.7V supply voltage?

Yes, the 24AA02E64-I/SN is fully specified to operate down to 1.7V across its industrial temperature range (-40°C to +85°C). At 1.7V, it supports 100 kHz I²C communication, maintains ≤1 µA standby current, and retains full read/write functionality-including acknowledge polling and page writes. This low-voltage capability is validated in Microchip's DS20002124H datasheet and makes the 24AA02E64-I/SN suitable for energy-constrained applications where the 24AA02E64-I/SN replaces higher-voltage alternatives.

Is there any risk of unintentional write corruption during power transitions, and how does the 24AA02E64-I/SN prevent it?

The 24AA02E64-I/SN incorporates a VCC threshold detector that disables internal erase/write logic whenever VCC falls below 1.5V (nominal), preventing partial writes and data corruption during brown-out or power ramp conditions. Additionally, its write-protect architecture locks the EUI-64™ block (0x80–0xFF) at the silicon level-no software command can override this. These dual protections ensure that the identity stored in the 24AA02E64-I/SN remains intact across thousands of power cycles, meeting industrial reliability requirements.