Microchip Technology 24AA02/SN

Overview

24AA02/SN from Microchip Technology Inc. is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protection, 1.7V–5.5V operation, 400 kHz max clock (100 kHz below 2.5V), and industrial temperature range (–40°C to +85°C). It supports byte and 8-byte page writes with 5 ms max write cycle time and is commonly used for storing calibration data, MAC addresses, and configuration settings in embedded microcontroller systems.

For engineers reviewing the 24AA02/SN datasheet, 24AA02/SN pinout, 24AA02/SN application, or 24AA02/SN equivalent, key selection considerations include its 1.7V low-voltage operation, Schmitt-trigger I²C inputs for noise immunity, factory-programmable option, AEC-Q100 qualification for automotive use, and compatibility with standard I²C host controllers across industrial, medical, and consumer electronics designs.

Technical Context

The 24AA02/SN implements a two-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control, supporting standard-mode (100 kHz), fast-mode (400 kHz), and voltage-dependent timing. Its internal architecture includes an 8-byte page buffer, self-timed erase/write cycle, and Address Pointer that auto-increments during sequential reads.

Write protection is implemented via the dedicated WP pin: tied to VSS enables full read/write access; tied to VCC locks the entire 256-byte array. All A0–A2 pins are unconnected - no external pull-up/down required - simplifying PCB layout and eliminating address conflict concerns in multi-device I²C buses.

Key Specifications

Pinout & Package

24AA02/SN is supplied in an 8-lead SOIC package (SN suffix per Microchip's Device Selection Table). Pin functions are standardized across all 24XX02 variants: VSS (GND), SDA (bidirectional open-drain I²C data), SCL (I²C clock input), WP (hardware write-protect enable), and VCC (power supply); A0–A2 are not connected internally and may be left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02B/SN and AT24C02C-SSHM-T, the 24AA02/SN uniquely supports 1.7V operation while maintaining full I²C compatibility and AEC-Q100 qualification - making it the optimal choice for automotive and ultra-low-power embedded systems where voltage headroom is constrained.

Availability

24AA02/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive telematics modules requiring stable component supply across extended lifecycle programs.

Supply support for 24AA02/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 24AA02/SN belongs to Microchip's 24XX02 family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile storage in space-constrained embedded systems where robustness, long-term data integrity, and automotive-grade qualification are essential.

FAQ

What is the maximum I²C clock frequency supported by the 24AA02/SN?

The 24AA02/SN supports up to 400 kHz when V_CC ≥ 2.5V, and 100 kHz when V_CC is between 1.7V and 2.5V. This voltage-dependent speed scaling ensures signal integrity and noise immunity at lower supply voltages. The 24AA02/SN does not support 1 MHz operation - that capability is reserved for the 24FC02 variant. Always verify timing parameters from DS20001709N, Table 1-2.

How does the WP pin function on the 24AA02/SN?

On the 24AA02/SN, the WP (Write-Protect) pin is a logic-controlled enable: when tied to VSS (GND), full read/write access is granted; when tied to VCC, the entire 256-byte memory array is locked against writes while reads remain fully functional. This hardware-level protection operates independently of I²C commands and cannot be overridden in software - a critical safety feature for production firmware and calibration data.

Are the A0, A1, and A2 pins used on the 24AA02/SN?

No - the A0, A1, and A2 pins on the 24AA02/SN are not connected internally and serve no functional purpose. They may be left floating, tied to VSS, or tied to VCC without affecting operation. This eliminates address conflicts in multi-device I²C systems and simplifies PCB routing, as no external pull-up resistors or address-select jumpers are required for the 24AA02/SN.

What package type does the 24AA02/SN use, and what are its dimensions?

The 24AA02/SN uses an 8-lead SOIC (Small Outline Integrated Circuit) package, designated "SN" per Microchip's packaging nomenclature. Its body dimensions are 3.90 mm wide × 4.90 mm long × 1.75 mm height, with 1.27 mm lead pitch. This industry-standard footprint ensures drop-in compatibility with existing SOIC-8 footprints and supports automated assembly using standard reflow profiles.

Does the 24AA02/SN support page write operations, and what is the buffer size?

Yes, the 24AA02/SN supports page write operations with an 8-byte page buffer. This allows up to eight consecutive bytes to be loaded into the buffer and written to memory in a single I²C transaction, reducing bus overhead and improving effective write throughput compared to individual byte writes. Page boundaries align every 8 bytes (addresses 0x00–0x07, 0x08–0x0F, etc.), and crossing a boundary causes wraparound within the current page.