Microchip Technology 24AA02E64T-I/OT

Overview

24AA02E64T-I/OT 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. It is used in networked IoT edge nodes requiring IEEE-compliant MAC-layer addressing.

For engineers reviewing the 24AA02E64T-I/OT datasheet, 24AA02E64T-I/OT pinout, 24AA02E64T-I/OT application, or 24AA02E64T-I/OT equivalent, key selection criteria include guaranteed EUI-64™ uniqueness, 8-byte page write capability, Schmitt-trigger noise immunity on SDA/SCL, industrial temperature support (−40°C to +85°C), and SOIC/SOT-23 package compatibility with I²C bus timing compliance at 1.7V.

Technical Context

The 24AA02E64T-I/OT implements a two-block 128 × 8-bit EEPROM array with fixed 8-byte page write buffer and permanent write protection on upper half (0x80–0xFF). Its I²C slave interface uses hardwired 0b1010 control code; A0/A1/A2 pins are unconnected and functionally absent - eliminating address conflicts and simplifying PCB layout for single-device identity storage.

Internal logic includes VCC threshold detection (<1.5V disable), Schmitt-trigger inputs with 0.05×VCC hysteresis, and slope-controlled outputs to suppress ground bounce. Write cycles are self-timed (≤5 ms), and ACK polling enables precise host synchronization without fixed delays.

Key Specifications

Pinout & Package

24AA02E64T-I/OT is available in 5-lead SOT-23 and 8-lead SOIC packages. A0, A1, and A2 pins are not connected - no external pull-up/down required and no address selection logic needed.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EEPROM identity storage applications.

Compared with 24AA02E64T-I/OT, the 24AA02E48T-I/OT offers lower address bit depth but identical footprint and power behavior, while AT24C02C-SSHM-T trades guaranteed uniqueness for programmability - making 24AA02E64T-I/OT optimal for zero-touch, standards-compliant identity deployment.

Availability

24AA02E64T-I/OT is available at Aetrix Electronics and suitable for industrial Ethernet nodes, medical sensor hubs, smart building controllers, automotive telematics modules, and IoT edge gateways requiring stable component supply with guaranteed EUI-64™ identity.

Supply support for 24AA02E64T-I/OT 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 design and manufacturing operations.

The 24AA02E64 series belongs to Microchip's serial EEPROM product line, designed specifically for secure, standards-compliant device identity storage in networked embedded systems - emphasizing factory-programmed uniqueness, low-voltage reliability, and industrial-grade robustness.

FAQ

What is the exact memory organization of the 24AA02E64T-I/OT?

The 24AA02E64T-I/OT contains 2 Kbit (256 bytes) of EEPROM arranged as two blocks of 128 × 8-bit locations. The upper half (0x80–0xFF) is permanently write-protected and holds the factory-programmed EUI-64™ address (0xF8–0xFF). The lower half (0x00–0x7F) is fully user-writable. This structure ensures identity integrity while preserving space for application data - a key design feature of the 24AA02E64T-I/OT.

Does the 24AA02E64T-I/OT support I²C clock stretching or multi-master arbitration?

No, the 24AA02E64T-I/OT does not support clock stretching or multi-master arbitration. It operates strictly as an I²C slave device with fixed 7-bit address (0b1010xxx, where A0–A2 are "don't care"). The 24AA02E64T-I/OT relies on the master to control bus timing and arbitration. Its design prioritizes simplicity and deterministic response - consistent with its role as a dedicated identity storage device rather than a general-purpose I²C peripheral.

Can the EUI-64™ address in the 24AA02E64T-I/OT be reprogrammed or erased?

No, the EUI-64™ address in the 24AA02E64T-I/OT is factory-programmed into the upper memory block (0xF8–0xFF) and permanently write-protected. Attempts to write to this region are ignored. This immutability is a core specification of the 24AA02E64T-I/OT - ensuring globally unique, tamper-resistant identity essential for network security and device certification.

What is the maximum write cycle time for the 24AA02E64T-I/OT, and how should hosts handle it?

The maximum write cycle time for the 24AA02E64T-I/OT is 5 ms (typical 3 ms). Hosts must either wait this fixed duration after each Stop condition initiating a write, or use ACK polling: repeatedly send Start + control byte (R/W = 0) until the device responds with ACK. This method maximizes I²C bus utilization and is explicitly supported in the 24AA02E64T-I/OT's functional specification.

Is the 24AA02E64T-I/OT pin-compatible with the 24AA02E48T-I/OT?

Yes, the 24AA02E64T-I/OT is pin-compatible with the 24AA02E48T-I/OT in both SOIC and SOT-23 packages. Both share identical pinouts (SCL, SDA, VSS, VCC, NC), identical A0/A1/A2 pin absence, and identical electrical interface characteristics. The only functional difference is the pre-programmed address length (EUI-64™ vs. EUI-48™), making them drop-in replacements where address format requirements permit.