Microchip Technology 24AA02E48T-I/SN

Overview

24AA02E48T-I/SN from Microchip Technology Inc. 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 clock (100 kHz at VCC < 2.5V), and delivers ≤1 µA standby current (I-temp) for embedded network identity storage in IoT edge nodes and industrial controllers.

For engineers reviewing the 24AA02E48T-I/SN datasheet, 24AA02E48T-I/SN pinout, 24AA02E48T-I/SN application, or 24AA02E48T-I/SN equivalent, key selection criteria include guaranteed EUI-48™ uniqueness, I²C bus noise immunity via Schmitt-trigger inputs, 8-byte page write capability, and SOIC-8 packaging with industrial temperature range (–40°C to +85°C).

Technical Context

The 24AA02E48T-I/SN implements a two-block 128 × 8-bit EEPROM array with hardware write protection on upper half (0x80–0xFF), where the pre-programmed EUI-48™ address resides. Its I²C slave interface uses open-drain SDA/SCL with internal slope control and 50 ns input filter spike suppression to ensure robust operation on noisy PCBs.

No chip-select pins (A0/A1/A2) are connected - confirmed by datasheet Table 2-1 and Figure 2-1 - making it a fixed-address device (slave address 0xA0/0xA1) without cascading capability. Internal address pointer auto-increments during sequential reads, and ACK polling enables precise timing of write-cycle completion without fixed delays.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (SN), 3.90 mm body width, RoHS-compliant matte tin finish per JEDEC MS-012.

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 24AA025E48T-I/SN, the 24AA02E48T-I/SN offers simpler fixed-address integration but lacks multi-device support; versus AT24MAC402-MAHM-T, it provides identical functionality in larger SOIC-8 packaging with established Microchip driver ecosystem support.

Availability

24AA02E48T-I/SN is available at Aetrix Electronics and suitable for industrial automation, medical IoT, and automotive telematics requiring stable component supply with guaranteed EUI-48™ uniqueness and long-term data retention.

Supply support for 24AA02E48T-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 microcontrollers, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA02E48T-I/SN belongs to Microchip's EUI-series serial EEPROM family, designed specifically to deliver factory-programmed, IEEE-compliant node identity for secure, standards-based networked device deployment.

FAQ

What is the exact memory organization of the 24AA02E48T-I/SN?

The 24AA02E48T-I/SN contains 2 Kbit (256 bytes) of EEPROM organized as two 128-byte blocks. The upper block (0x80–0xFF) is permanently write-protected and holds the factory-programmed EUI-48™ address at locations 0xFA–0xFF. The lower block (0x00–0x7F) is user-writable for application data storage. This structure ensures MAC address integrity while allowing flexible use of remaining memory.

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

No, the 24AA02E48T-I/SN does not support clock stretching - it is a simple slave device that relies on master-controlled timing. It fully complies with standard I²C multi-master arbitration rules via its open-drain SDA/SCL interface and ACK/NACK protocol. The 24AA02E48T-I/SN responds only to its fixed slave address (0xA0 write / 0xA1 read) and does not participate in address arbitration beyond standard acknowledge behavior.

How is the EUI-48™ address verified as globally unique for the 24AA02E48T-I/SN?

Each 24AA02E48T-I/SN receives a globally unique EUI-48™ address during factory programming using Microchip's IEEE-assigned OUI (Organizationally Unique Identifier) followed by a proprietary 24-bit extension. Uniqueness is ensured through centralized database tracking and serialization during wafer-level testing. The address is permanently stored in write-protected memory (0xFA–0xFF) and cannot be altered in the field - verified by reading back the hex values post-soldering.

Can the 24AA02E48T-I/SN be used in automotive applications requiring AEC-Q200 qualification?

No, the 24AA02E48T-I/SN carries the "I" suffix denoting Industrial temperature grade (–40°C to +85°C), not the "E" suffix for Automotive (–40°C to +125°C) or AEC-Q200 qualification. For automotive use, select the 24AA02E48T-E/SN variant, which undergoes additional stress testing and screening per AEC-Q200 Rev D. The 24AA02E48T-I/SN is qualified only for industrial and commercial environments.

What is the maximum recommended pull-up resistor value for SDA/SCL on the 24AA02E48T-I/SN at 400 kHz?

For reliable 400 kHz I²C operation, Microchip specifies a maximum SDA/SCL pull-up resistor of 2 kΩ when VCC = 2.5V–5.5V. This value ensures rise time remains within AC specification limits (TR ≤ 300 ns). At lower VCC (1.7V–2.5V), the limit tightens due to reduced drive strength; use 1.5 kΩ or lower. Always validate with oscilloscope measurements on the target PCB, accounting for bus capacitance.