Microchip Technology 24AA02E48-I/SN

Overview

24AA02E48-I/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 below 2.5V), and delivers ≤1 µA standby current (I-temp) for low-power embedded identity storage in networked devices.

For engineers reviewing the 24AA02E48-I/SN datasheet, 24AA02E48-I/SN pinout, 24AA02E48-I/SN application, or 24AA02E48-I/SN equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases in secure device identification, and validated alternative options for EUI-48™-enabled systems.

Technical Context

The 24AA02E48-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 SDA/SCL inputs and slope-controlled outputs to suppress noise and eliminate ground bounce.

It features an internal VCC threshold detector disabling erase/write below 1.5V, supports acknowledge polling for write-cycle completion detection, and uses a 4-bit control code (1010) with "don't care" A0–A2 pins - confirming no chip-select addressing capability in this variant.

Key Specifications

Pinout & Package

24AA02E48-I/SN is supplied in 8-lead SOIC (SN) package per JEDEC MS-012, with 3.90 mm body width and standard gull-wing leads. Pins A0, A1, and A2 are not connected and must be left floating or tied to VSS/VCC - no chip-select functionality.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EUI-48™-based identity storage applications.

Compared with 24AA02E48-I/SN, the 24AA025E48-I/SN adds cascading capability but requires PCB layout changes and firmware adaptation, while the AT24C02C-SSHM-T offers footprint compatibility but shifts identity management burden entirely to the system level - making 24AA02E48-I/SN optimal for zero-touch, standards-compliant hardware identity.

Availability

24AA02E48-I/SN is available at Aetrix Electronics and suitable for industrial automation, medical device UDI compliance, and automotive telematics requiring stable component supply with guaranteed EUI-48™ identity integrity.

Supply support for 24AA02E48-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 24AA02E48-I/SN belongs to Microchip's serial EEPROM family designed specifically for secure, standards-compliant hardware identity storage in networked and regulated electronic systems.

FAQ

What is the exact memory organization and address map of the 24AA02E48-I/SN?

The 24AA02E48-I/SN contains 256 bytes (2 Kbit) organized as two 128-byte blocks. The lower block (0x00–0x7F) is user-writable; the upper block (0x80–0xFF) is permanently write-protected and holds the pre-programmed EUI-48™ address at locations 0xFA–0xFF. This layout ensures identity integrity while reserving 128 bytes for application data storage in the 24AA02E48-I/SN.

Does the 24AA02E48-I/SN support I²C clock stretching or multi-master arbitration?

No - the 24AA02E48-I/SN does not implement clock stretching and is strictly a slave device with no arbitration logic. It relies on the master to control bus timing and resolve collisions. Its I²C interface complies with standard mode (100 kHz) and fast mode (400 kHz) specifications, but does not support high-speed mode or clock synchronization features. This behavior is consistent across all 24AA02E48-I/SN units.

Can the EUI-48™ address in the 24AA02E48-I/SN be overwritten or reprogrammed?

No - the EUI-48™ address stored at 0xFA–0xFF in the 24AA02E48-I/SN is permanently write-protected by internal hardware. Attempts to write to this region are ignored. Only the lower 128 bytes (0x00–0x7F) are user-writable. This protection is inherent to the 24AA02E48-I/SN silicon design and cannot be disabled or bypassed.

What is the maximum I²C bus capacitance supported by the 24AA02E48-I/SN at 400 kHz?

The 24AA02E48-I/SN specifies a maximum pin capacitance of 10 pF per I/O pin (SDA/SCL) at 5.0V and 25°C. For reliable 400 kHz operation, total bus capacitance (including PCB traces, connectors, and other devices) must remain ≤400 pF - consistent with standard I²C fast-mode requirements. External pull-up resistors should be ≤2 kΩ to meet rise-time specs. This limit applies directly to the 24AA02E48-I/SN in SOIC-8 packaging.

Is the 24AA02E48-I/SN RoHS compliant and qualified for automotive use?

The 24AA02E48-I/SN is RoHS compliant per Microchip's documentation, but it is rated for Industrial temperature range (-40°C to +85°C), not Automotive (-40°C to +125°C). The automotive-grade variant is 24AA02E48-E/SN. Using the 24AA02E48-I/SN in automotive environments may violate thermal specifications and void warranty - always verify ambient operating conditions against the I-temp rating of the 24AA02E48-I/SN.