Microchip Technology 24AA02H-I/ST

Overview

24AA02H-I/ST from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protect for the upper half-array (80h–FFh), 1.7V–5.5V operation, and AEC-Q100 qualification for automotive use. It supports 400 kHz clock frequency at V_CC ≥ 2.5V, features Schmitt-trigger inputs and slope-controlled outputs, and delivers ≤1 µA standby current for low-power embedded systems.

For engineers reviewing the 24AA02H-I/ST datasheet, 24AA02H-I/ST pinout, 24AA02H-I/ST application, or 24AA02H-I/ST equivalent, this page provides verified electrical specs, package mapping to ST (SOIC-8), confirmed I²C timing compliance, write-protection behavior, and real-world design implications of its 8-byte page buffer and half-array WP logic.

Technical Context

The 24AA02H-I/ST implements a two-wire I²C interface with fixed 7-bit client address (1010xxxR/W) and no internal connection to A0–A2 pins - enabling single-device bus placement without address conflicts. Its memory controller uses an internal Address Pointer that auto-increments during sequential reads and wraps on page boundary overflow.

Write operations are self-timed with a maximum 5 ms cycle time; acknowledge polling is supported to detect completion without fixed delays. The device integrates Schmitt-trigger inputs and output slope control to suppress ground bounce and noise spikes up to 50 ns, ensuring robust operation in electrically noisy automotive and industrial environments.

Key Specifications

Pinout & Package

24AA02H-I/ST is packaged in an 8-lead SOIC (SN) body per Microchip drawing C04-057-SN Rev F, with standard 1.27 mm pitch and 3.90 mm width. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02B-I/ST and AT24C02C-SSHM-T, the 24AA02H-I/ST uniquely combines 1.7V operation, AEC-Q100 Grade 1 qualification, and hardware-based half-array write protection - making it the only choice for safety-critical automotive modules requiring guaranteed data integrity across voltage and temperature extremes.

Availability

24AA02H-I/ST is available at Aetrix Electronics and suitable for automotive ECU development, industrial sensor calibration, and secure boot implementation requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for 24AA02H-I/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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 24XX02H family was designed specifically for automotive and industrial applications demanding high reliability, low-voltage operation, and hardware-enforced data protection - targeting ECU configuration, sensor calibration, and secure identity storage.

FAQ

What is the minimum operating voltage for the 24AA02H-I/ST?

The 24AA02H-I/ST operates down to 1.7V, enabling direct interfacing with 1.8V logic families and battery-powered systems without level-shifting circuitry. This is a key differentiator from the 24LC02B-I/ST, which requires a minimum 2.5V supply. The 24AA02H-I/ST maintains full I²C functionality and write endurance across the entire 1.7V–5.5V range.

How does the write-protect feature work on the 24AA02H-I/ST?

The 24AA02H-I/ST uses a hardware WP pin: tying it to V_CC protects addresses 80h–FFh (upper 128 bytes), while tying it to V_SS disables protection entirely. Unlike software-based schemes, this is immune to firmware bugs or bus glitches. The 24AA02H-I/ST does not support byte-level or software-configurable protection - only the fixed half-array mode.

Is the 24AA02H-I/ST pin-compatible with other 2 Kbit I²C EEPROMs?

Yes, the 24AA02H-I/ST in SOIC-8 (ST) package shares identical pinout and footprint with industry-standard 2 Kbit I²C EEPROMs like the 24LC02B-I/ST and AT24C02C-SSHM-T. However, functional compatibility requires verifying V_CC range, WP behavior, and temperature grade - the 24AA02H-I/ST's 1.7V min and AEC-Q100 qualification are not matched by most alternatives.

What is the maximum I²C clock frequency supported by the 24AA02H-I/ST?

The 24AA02H-I/ST supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher. At V_CC < 2.5V (e.g., 1.7V–2.4V), the maximum clock rate drops to 100 kHz to ensure timing margin. This dual-speed capability allows flexible deployment across both legacy and high-speed I²C buses without redesign.

Does the 24AA02H-I/ST require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA02H-I/ST has open-drain SDA and SCL pins and requires external pull-up resistors. For 400 kHz operation, a 2 kΩ resistor to V_CC is recommended; for 100 kHz, 10 kΩ is typical. Incorrect pull-up values cause timing violations or bus lockup - always verify rise/fall times against I²C specification limits in your layout.