Microchip Technology 24AA02E48T-E/SN

Overview

24AA02E48T-E/SN from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with factory-programmed, globally unique EUI-48™ node address stored in write-protected memory (0xFA–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 24AA02E48T-E/SN datasheet, 24AA02E48T-E/SN pinout, 24AA02E48T-E/SN application, or 24AA02E48T-E/SN equivalent, key selection criteria include guaranteed EUI-48™ uniqueness, 8-byte page write capability, Schmitt-trigger noise immunity on SDA/SCL, automotive-grade temperature range (–40°C to +125°C), and SOIC-8 package compatibility with legacy footprint designs.

Technical Context

The 24AA02E48T-E/SN implements a fixed 2-wire I²C slave interface with no chip-select pins (A0–A2 not connected), using control code '1010' and R/W bit to initiate read/write operations. Its internal address pointer enables current-address, random, and sequential reads across two 128 × 8-bit blocks.

Write protection is hardwired to the upper half of memory (0x80–0xFF), preserving the pre-programmed EUI-48™ address; only 0x00–0x7F is user-writable. Internal write cycles are self-timed (typ. 3 ms, max 5 ms), and acknowledge polling is supported to detect completion without fixed delay timing.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (SN), 3.90 mm body width, RoHS-compliant matte tin finish. Pin 1 marked by beveled corner or laser dot; pin 1 = NC, pin 2 = NC, pin 3 = NC, pin 4 = VSS, pin 5 = SDA, pin 6 = SCL, pin 7 = NC, pin 8 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02E48-I/SN, the 24AA02E48T-E/SN adds automotive temperature qualification and eliminates provisioning labor; compared with AT24C02C-SSHM-T, it trades programmability for guaranteed IEEE uniqueness and zero-touch deployment readiness.

Availability

24AA02E48T-E/SN is available at Aetrix Electronics and suitable for industrial Ethernet nodes, automotive telematics modules, and medical IoT sensor hubs requiring stable component supply with guaranteed EUI-48™ uniqueness and automotive-grade reliability.

Supply support for 24AA02E48T-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 24AA02E48T-E/SN belongs to Microchip's EUI-series serial EEPROM family, designed specifically to deliver factory-assigned, standards-compliant hardware identities for networked embedded systems without firmware intervention.

FAQ

What is the exact memory organization and address mapping of the 24AA02E48T-E/SN?

The 24AA02E48T-E/SN contains 2 Kbit (256 bytes) of EEPROM organized as two 128-byte blocks. The upper half (0x80–0xFF) is permanently write-protected and holds the pre-programmed EUI-48™ address at locations 0xFA–0xFF. The lower half (0x00–0x7F) is fully user-writable. The 24AA02E48T-E/SN uses a fixed I²C slave address (1010xxx0/1) with no A0–A2 pins - all three bits are "don't care" per datasheet DS20002124H.

Does the 24AA02E48T-E/SN support I²C clock stretching or multi-master arbitration?

No, the 24AA02E48T-E/SN does not support clock stretching or multi-master arbitration. It operates strictly as an I²C slave with fixed timing parameters: THIGH ≥600 ns (≥2.5V), TLOW ≥1300 ns (≥2.5V), and no internal hold on SCL. Arbitration is handled solely by the master device; the 24AA02E48T-E/SN asserts ACK only after valid address/data reception and never holds SCL low.

Can the EUI-48™ address in the 24AA02E48T-E/SN be overwritten or reprogrammed?

No, the EUI-48™ address stored in the 24AA02E48T-E/SN is factory-programmed into the upper memory block (0xFA–0xFF) and permanently write-protected. Any write attempt to addresses 0x80–0xFF is ignored. Only the lower block (0x00–0x7F) is writable. This ensures MAC address immutability - a critical requirement for IEEE 802.3 compliance and network security.

What is the maximum I²C bus capacitance supported by the 24AA02E48T-E/SN at 400 kHz operation?

At 400 kHz operation, the 24AA02E48T-E/SN supports ≤400 pF total bus capacitance, based on its specified rise time (TR ≤300 ns at VCC ≥2.5V) and standard I²C specification limits. For reliable 400 kHz communication, use 2 kΩ pull-up resistors and limit trace length to ≤15 cm on typical FR-4 PCBs. Exceeding this capacitance risks setup/hold violations and ACK failures.

How is the 24AA02E48T-E/SN protected against power-supply brownout during write operations?

The 24AA02E48T-E/SN includes an internal VCC threshold detector that disables erase/write logic if VCC drops below 1.5V (nominal). Combined with its 1.7V minimum operating voltage and automatic write-cycle suspension on undervoltage, this prevents partial writes and memory corruption. No external reset supervisor or brownout circuit is required - the 24AA02E48T-E/SN handles fault recovery autonomously.