Microchip Technology 24AA024H-I/ST

Overview

24AA024H-I/ST from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C). It features hardware write protection for the upper half-array (addresses 80h–FFh), 16-byte page write buffer, and Schmitt-trigger inputs for noise immunity. Used in embedded systems for storing calibration data, device configuration, and secure MAC address storage.

For engineers reviewing the 24AA024H-I/ST datasheet, 24AA024H-I/ST pinout, 24AA024H-I/ST application, or 24AA024H-I/ST equivalent, this page delivers verified electrical specs, validated I²C timing at 1.7V–5.5V, confirmed 8-pin SOIC package mapping, and real-world use cases in industrial control and IoT endpoint devices.

Technical Context

The 24AA024H-I/ST implements a true 2-wire I²C slave interface with fixed 7-bit address prefix '1010' and user-configurable A0–A2 pins enabling up to eight devices on one bus. Its internal address counter supports current-address, random, and sequential read modes without external address latching.

Write operations include byte-write and page-write (up to 16 bytes per cycle), both initiating self-timed internal erase/write cycles with 5 ms max duration. Hardware write protection is controlled solely by the WP pin state-tied to VCC for protecting addresses 80h–FFh, or VSS for full-array access.

Key Specifications

Pinout & Package

24AA024H-I/ST is supplied in an 8-pin SOIC (150 mil) package with standard JEDEC MS-012AC footprint (5.3 mm × 4.4 mm × 1.75 mm height). Pin 1 is marked with a beveled corner or dot; orientation follows industry-standard SOIC convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC024H-I/ST and AT24C02-PU, the 24AA024H-I/ST uniquely supports 1.7V operation and provides dedicated hardware write protection for the upper memory block-critical for secure device identity storage in battery-constrained and safety-certified systems.

Availability

24AA024H-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, IoT device identity storage, medical device configuration, and automotive body control module applications requiring stable component supply across extended product lifecycles.

Supply support for 24AA024H-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 operations.

The 24AA024H-I/ST belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, and secure nonvolatile data storage in space-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the minimum operating voltage for the 24AA024H-I/ST?

The 24AA024H-I/ST operates down to 1.7V, making it compatible with single-cell lithium iron phosphate (LiFePO₄) batteries and ultra-low-power microcontrollers. This specification is validated across the full industrial temperature range (–40°C to +85°C) and applies to all functions including read, write, and address decoding. Below 1.7V, the internal voltage detector disables write logic to prevent data corruption.

How does hardware write protection work on the 24AA024H-I/ST?

Hardware write protection on the 24AA024H-I/ST is controlled exclusively by the WP pin: when tied to VCC, addresses 80h–FFh (upper 128 bytes) are locked against write and page-write commands; when tied to VSS, full-array access is enabled. The protection is active during power-up and remains asserted until WP state changes - no software command or timing sequence can override it.

Can multiple 24AA024H-I/ST devices share the same I²C bus?

Yes - up to eight 24AA024H-I/ST devices can operate on a single I²C bus using the A0, A1, and A2 pins to configure unique 3-bit chip select codes. Each device responds only to its assigned 7-bit slave address (1010 A2 A1 A0 R/W), enabling contiguous 16 Kbit memory expansion without external multiplexing or address translation logic.

What is the maximum I²C clock frequency supported by the 24AA024H-I/ST?

The 24AA024H-I/ST supports up to 400 kHz I²C clock frequency when VCC is 1.8V or higher. At VCC < 1.8V, maximum clock speed is limited to 100 kHz to ensure reliable timing margin. These limits are guaranteed across the full industrial temperature range and apply to both read and write transactions, including acknowledge polling.

Does the 24AA024H-I/ST require external pull-up resistors on SDA and SCL lines?

Yes - the 24AA024H-I/ST has open-drain SDA and SCL outputs and requires external pull-up resistors. Recommended values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz, connected to the same VCC rail used by the device. Pull-ups must be placed close to the 24AA024H-I/ST to minimize trace capacitance and meet rise-time specifications.