Microchip Technology 24AA02T/ST

Overview

24AA02T/ST 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, and industrial temperature range (–40°C to +85°C). It supports up to 400 kHz clock frequency, features an 8-byte page write buffer, and delivers ≤1 µA standby current - used for secure device identification and configuration storage in embedded controllers and IoT edge nodes.

For engineers reviewing the 24AA02T/ST datasheet, 24AA02T/ST pinout, 24AA02T/ST application, or 24AA02T/ST equivalent, key selection considerations include its I²C address flexibility (fixed 0xA0–0xA7), WP-pin-based full-array write protection, low-voltage compatibility down to 1.7V, and AEC-Q100 qualification for automotive subsystems.

Technical Context

The 24AA02T/ST implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes without external addressing logic.

It uses self-timed erase/write cycles with built-in charge-pump HV generation, supports acknowledge polling for bus efficiency, and enforces strict timing compliance per I²C specification - including 600 ns minimum THD:STA and 900 ns TAA at 2.5–5.5V supply.

Key Specifications

Pinout & Package

24AA02T/ST is supplied in an 8-lead SOIC package (SOIC-8, 3.90 mm body width). Pin 1 is marked with a notch or dot; A0–A2 are no-connect pins internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02B/ST and 24FC02T/ST, the 24AA02T/ST uniquely enables reliable operation down to 1.7V while maintaining industrial temperature rating and AEC-Q100 qualification - making it optimal for energy-harvesting sensors and dual-supply automotive gateways where voltage headroom is constrained.

Availability

24AA02T/ST is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and IoT endpoint design requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 24AA02T/ST 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The 24AA02T/ST belongs to Microchip's 24XX02 family of I²C EEPROMs, designed specifically for secure, low-power, and space-constrained nonvolatile storage in automotive, industrial, and consumer applications.

FAQ

What is the I²C address range supported by the 24AA02T/ST?

The 24AA02T/ST uses a fixed 7-bit I²C client address of 0xA0 (1010000b) with R/W bit appended, yielding write address 0xA0 and read address 0xA1. Unlike higher-density variants, A0–A2 pins are not connected internally, so no address pin strapping is possible - the 24AA02T/ST occupies a single, unchangeable address slot on the I²C bus.

Does the 24AA02T/ST require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA02T/ST has open-drain SDA and SCL terminals and requires external pull-up resistors. Typical values are 10 kΩ for 100 kHz operation, 2 kΩ for 400 kHz, and ≤1 kΩ for marginal 1 MHz use (though 24AA02T/ST is rated to 400 kHz max). Resistor value must be selected based on bus capacitance and desired rise time per I²C specification.

How does write protection work on the 24AA02T/ST?

Write protection on the 24AA02T/ST is controlled solely by the WP pin: tying WP to VCC disables all write operations (including byte and page writes) across the entire 256-byte memory array, while leaving read access fully functional. Tying WP to VSS enables normal read/write operation. No software command or internal register setting is involved - it is purely hardware-enforced.

Can the 24AA02T/ST be used in automotive applications?

Yes, the 24AA02T/ST is AEC-Q100 qualified (Grade 2 and Grade 3), rated for –40°C to +125°C junction temperature, and manufactured in TS16949-certified facilities. It is approved for use in automotive body electronics, infotainment interfaces, and ADAS sensor modules where secure, low-power configuration storage is required.

What is the maximum page write size for the 24AA02T/ST?

The 24AA02T/ST supports an 8-byte page write buffer. When performing a page write, up to eight consecutive bytes can be loaded into the buffer and committed to memory with a single Stop condition. Writes crossing physical page boundaries (every 8 bytes, starting at 0x00, 0x08, etc.) wrap around within the same page - software must enforce alignment to avoid unintended overwrites.