Microchip Technology 24AA02E64T-E/SN

Overview

24AA02E64T-E/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 at VCC < 2.5V), and delivers ≤1 µA standby current (I-temp) for low-power embedded identity storage in networked edge devices.

For engineers reviewing the 24AA02E64T-E/SN datasheet, 24AA02E64T-E/SN pinout, 24AA02E64T-E/SN application, or 24AA02E64T-E/SN equivalent, key selection criteria include guaranteed EUI-64™ uniqueness, 8-byte page write capability, Schmitt-trigger noise immunity on SDA/SCL, I²C slave addressing without A0–A2 pins, and industrial temperature support (−40°C to +85°C).

Technical Context

The 24AA02E64T-E/SN implements a two-block 128 × 8-bit EEPROM array with hardware write protection for the upper half (0x80–0xFF), where the EUI-64™ address resides. Its I²C interface uses open-drain SDA/SCL with internal Schmitt triggers and slope control to suppress ground bounce and tolerate bus noise.

It requires no external chip-select inputs: A0, A1, and A2 pins are unconnected and unused - simplifying PCB layout versus cascaded variants like 24AA025E64. Device addressing uses fixed 4-bit control code '1010' followed by three don't-care bits and R/W bit, enabling single-device integration without address configuration.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (SN), 3.90 mm body width, RoHS-compliant matte tin finish. Pin 1 marked with notch or dot; pin 1 = VSS (GND), pin 8 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02E48T-E/SN, the 24AA02E64T-E/SN provides native EUI-64™ support eliminating software encapsulation; versus AT24CM01-XHD-T, it trades raw capacity for guaranteed, tamper-proof identity - critical for zero-touch provisioning.

Availability

24AA02E64T-E/SN is available at Aetrix Electronics and suitable for industrial IoT node identity, medical sensor MAC storage, and automotive telematics module design requiring stable component supply and guaranteed EUI-64™ uniqueness.

Supply support for 24AA02E64T-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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA02E64T-E/SN belongs to Microchip's 24AA02XEXX family of preprogrammed identity EEPROMs, designed specifically to simplify IEEE-compliant device identification in resource-constrained embedded systems.

FAQ

What is the exact memory organization of the 24AA02E64T-E/SN?

The 24AA02E64T-E/SN contains 2 Kbit (256 bytes) of EEPROM arranged as two 128-byte blocks. The upper block (0x80–0xFF) holds the factory-programmed, write-protected EUI-64™ address (0xF8–0xFF); the lower block (0x00–0x7F) is user-programmable. This structure ensures identity integrity while reserving 128 bytes for application data.

Does the 24AA02E64T-E/SN require external pull-up resistors on SDA and SCL?

Yes, the 24AA02E64T-E/SN uses open-drain SDA and SCL pins and requires external pull-up resistors. For 400 kHz operation, a 2 kΩ resistor to VCC is recommended; for 100 kHz, 10 kΩ is typical. No pull-ups are needed on A0–A2 since those pins are unconnected in the 24AA02E64T-E/SN.

Can the EUI-64™ address in the 24AA02E64T-E/SN be modified or erased?

No. The EUI-64™ address in the 24AA02E64T-E/SN is factory-programmed into the upper memory block (0xF8–0xFF) and permanently write-protected. Attempts to write to this region are ignored. Only the lower 128 bytes (0x00–0x7F) are user-writable - preserving identity integrity across the device lifetime.

What is the I²C slave address of the 24AA02E64T-E/SN?

The 24AA02E64T-E/SN uses a fixed 7-bit I²C slave address of 0x50 (write) / 0x51 (read). This is derived from the base control code '1010' followed by three don't-care bits (since A0–A2 are unconnected), resulting in a hardwired address - unlike variants such as 24AA025E64 which use A0–A2 for address selection.

Is the 24AA02E64T-E/SN qualified for automotive temperature range?

No. The 24AA02E64T-E/SN suffix 'T-E/SN' indicates Industrial temperature grade (−40°C to +85°C), not Automotive (−40°C to +125°C). The Automotive-grade variant is 24AA02E64T-I/SN (note 'I' in place of 'E' in temperature code). Always verify the full part number's temperature suffix against application environmental requirements.