Microchip Technology 24AA02E64-E/SN

Overview

24AA02E64-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 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 24AA02E64-E/SN datasheet, 24AA02E64-E/SN pinout, 24AA02E64-E/SN application, or 24AA02E64-E/SN equivalent, this device serves as a secure, tamper-resistant hardware identity source for MAC address assignment, device authentication, and IEEE-compliant node addressing in industrial IoT nodes, automotive ECUs, and networked sensors - where guaranteed uniqueness and I²C bus compatibility are critical.

Technical Context

The 24AA02E64-E/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 erase/write logic below 1.5V. The pre-programmed EUI-64™ address occupies eight contiguous bytes and requires no user programming - enabling plug-and-play IEEE 1284/64-bit node identity in compliant systems.

Key Specifications

Pinout & Package

8-lead SOIC (SN) package per Microchip Drawing C04-057-SN Rev D: 3.90 mm body width, 1.27 mm pitch, matte tin lead finish. RoHS compliant, industrial temperature range (-40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM with factory-programmed node identity applications.

Compared with 24AA02E48-E/SN, the 24AA02E64-E/SN provides native EUI-64™ support eliminating software conversion, while AT24MAC402-MAHM-T trades EUI-64™ for automotive qualification - making 24AA02E64-E/SN optimal for industrial and medical designs needing plug-and-play IEEE 64-bit identity without thermal derating.

Availability

24AA02E64-E/SN is available at Aetrix Electronics and suitable for industrial Ethernet nodes, automotive body control modules, smart sensor edge nodes, and medical wearable devices requiring stable component supply with guaranteed long-term availability.

Supply support for 24AA02E64-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 24AA02E64-E/SN belongs to Microchip's serial EEPROM family designed specifically for secure, factory-provisioned device identity in networked systems - targeting applications where IEEE EUI-64™ compliance, low power, and I²C simplicity are essential.

FAQ

What is the primary function of the 24AA02E64-E/SN in a system design?

The 24AA02E64-E/SN serves as a factory-programmed, tamper-resistant source of IEEE EUI-64™ node identity. It stores a globally unique 64-bit address in write-protected memory (0xF8–0xFF) and provides it via I²C upon system boot - enabling automatic MAC assignment, device authentication, and network registration without firmware provisioning. This makes the 24AA02E64-E/SN ideal for zero-touch deployment in industrial and medical IoT systems.

Does the 24AA02E64-E/SN require external pull-up resistors on its I²C lines?

Yes, the 24AA02E64-E/SN requires external pull-up resistors on both SDA and SCL lines because it uses open-drain outputs. For 400 kHz operation, a 2 kΩ pull-up to VCC is recommended; for 100 kHz, 10 kΩ is typical. These resistors ensure proper signal rise times and bus arbitration - omission will cause communication failure. The 24AA02E64-E/SN itself does not integrate pull-ups.

Can the EUI-64™ address in the 24AA02E64-E/SN be modified after shipment?

No, the EUI-64™ address in the 24AA02E64-E/SN is factory-programmed into the upper half of memory (0xF8–0xFF) and permanently write-protected. Any write attempt to this region is ignored. Only the lower 1,024 bits (0x00–0x7F) are user-writable. This hardware-enforced lock ensures the 24AA02E64-E/SN delivers immutable, globally unique identity - a core requirement for standards-compliant networked devices.

What is the maximum I²C clock frequency supported by the 24AA02E64-E/SN?

The 24AA02E64-E/SN supports up to 400 kHz I²C clock frequency when VCC is ≥2.5V. At VCC <2.5V, the maximum clock rate drops to 100 kHz to maintain timing margin. This dual-speed capability allows the 24AA02E64-E/SN to operate reliably across wide input voltage ranges - from 1.7V battery sources to 5.5V industrial rails - without sacrificing bus throughput where possible.

Is the 24AA02E64-E/SN pin-compatible with other devices in the 24AA02XEXX family?

Yes, the 24AA02E64-E/SN shares identical 8-lead SOIC (SN) pinout and electrical interface with 24AA02E48-E/SN, 24AA025E48-E/SN, and 24AA025E64-E/SN. All variants use pins 1–3 as NC/A0–A2 (unconnected on E-series), pin 4 as VSS, pin 5 as SDA, pin 6 as SCL, pin 7 as NC, and pin 8 as VCC. This allows drop-in substitution within the same package - though functional differences (EUI-48™ vs. EUI-64™, page size, cascading) must be verified in firmware.