Microchip Technology 24AA02E64T-I/SN

Overview

24AA02E64T-I/SN from Microchip Technology 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 devices.

For engineers reviewing the 24AA02E64T-I/SN datasheet, 24AA02E64T-I/SN pinout, 24AA02E64T-I/SN application, or 24AA02E64T-I/SN equivalent, this page provides verified electrical specs, SOIC-8 package mapping, EUI-64™ memory layout, I²C timing constraints, and validated alternatives for secure device identification in industrial IoT nodes and Ethernet/Wi-Fi MAC address provisioning.

Technical Context

The 24AA02E64T-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 inputs and slope-controlled outputs to suppress noise and eliminate ground bounce on shared buses.

It features an internal address counter for sequential reads, acknowledge polling for write-cycle completion detection, and a VCC threshold detector disabling write logic below 1.5V. No A0/A1/A2 pins are present-device addressing uses only the fixed 4-bit control code '1010' followed by R/W bit.

Key Specifications

Pinout & Package

24AA02E64T-I/SN is supplied in an 8-lead SOIC (SN) package per JEDEC MS-012, 3.90 mm body width. Pin 1 is marked with a beveled corner or dot; pin numbering follows standard SOIC convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EEPROM-based node identity applications.

Compared with 24AA02E48T-I/SN and AT24C02C-SSHM-T, the 24AA02E64T-I/SN delivers plug-and-play IEEE EUI-64™ compliance without host-side conversion logic or post-silicon programming, reducing BOM count and qualification effort for IPv6-capable networking devices.

Availability

24AA02E64T-I/SN is available at Aetrix Electronics and suitable for industrial Ethernet nodes, Wi-Fi access points, medical sensor calibration systems, and automotive telematics modules requiring stable component supply with guaranteed EUI-64™ identity integrity.

Supply support for 24AA02E64T-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 24AA02E64T-I/SN belongs to Microchip's 24AA02XEXX family of pre-programmed identity EEPROMs, designed specifically to simplify IEEE-compliant device identification in embedded networking, IoT, and automotive applications without requiring external programming infrastructure.

FAQ

What is the exact memory organization and EUI-64™ location for 24AA02E64T-I/SN?

The 24AA02E64T-I/SN contains 256 bytes (2 Kbit) of EEPROM arranged as two 128-byte blocks. Its factory-programmed EUI-64™ node address occupies physical addresses 0xF8 through 0xFF (8 bytes), permanently write-protected. The lower 248 bytes (0x00–0xF7) are user-programmable. This layout is confirmed in Microchip DS20002124H, Figure 9-3.

Does 24AA02E64T-I/SN support standard I²C addressing, and what is its slave address?

Yes, 24AA02E64T-I/SN uses standard 7-bit I²C addressing with a fixed control code of '1010'. Since A0/A1/A2 pins are not connected, the full 7-bit address is always 0xA0 (write) or 0xA1 (read). This is explicitly stated in DS20002124H Section 5.0 and Table 2-1.

Can 24AA02E64T-I/SN operate reliably at 1.7V, and what are the timing implications?

Yes, 24AA02E64T-I/SN is fully specified down to 1.7V. At VCC <2.5V, maximum I²C clock frequency drops to 100 kHz, and AC timing parameters (e.g., THIGH, TLOW, TR/TF) relax per Table 1-2. These derated values ensure robust communication in ultra-low-voltage systems such as energy-harvesting sensors.

How is write protection implemented on 24AA02E64T-I/SN, and which memory regions are protected?

24AA02E64T-I/SN permanently write-protects the upper half of memory (addresses 0x80–0xFF), where the EUI-64™ node address resides. Writes to this region are ignored; reads remain fully functional. The lower half (0x00–0x7F) is freely readable and writable. This is documented in Section 6.3 of DS20002124H.

What package type and marking does 24AA02E64T-I/SN use, and how is it identified on the device body?

24AA02E64T-I/SN uses the 8-lead SOIC (SN) package per Microchip Drawing C04-057-SN. Marking consists of "24A2E64I" on the top surface, indicating Industrial temperature grade (I), plus date code and traceability characters. This matches Package Marking Table on DS20002124H page 16.