Microchip Technology 24AA024H-I/MS

Overview

24AA024H-I/MS 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 (80h–FFh), 16-byte page write buffer, and Schmitt-trigger inputs for noise immunity. Used in embedded systems for storing calibration data, configuration settings, and device identifiers.

For engineers reviewing the 24AA024H-I/MS datasheet, 24AA024H-I/MS pinout, 24AA024H-I/MS application, or 24AA024H-I/MS equivalent, key selection criteria include low-voltage operation down to 1.7V, 400 kHz I²C clock support, 1 μA standby current, and MSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The 24AA024H-I/MS implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three user-configurable chip-select bits (A0–A2), enabling up to eight devices on one bus. Its internal address pointer auto-increments during sequential reads and supports current-address, random, and sequential read modes.

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

Key Specifications

Pinout & Package

24AA024H-I/MS is housed in an 8-pin MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for high-density PCB layouts. Pin functions are electrically identical across SOIC, TSSOP, PDIP, and TDFN variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC024H-I/MS and AT24C02-MAHM-T, the 24AA024H-I/MS uniquely combines 1.7V operation, hardware half-array write protection, and industrial temperature rating in MSOP-8 - making it optimal for ultra-low-power, safety-critical, or mixed-voltage embedded designs.

Availability

24AA024H-I/MS is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, medical diagnostics, and automotive body control modules requiring stable component supply across extended production lifecycles.

Supply support for 24AA024H-I/MS 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 belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in cost-sensitive and space-constrained embedded applications.

FAQ

What is the minimum VCC voltage required for reliable operation of the 24AA024H-I/MS?

The 24AA024H-I/MS operates reliably down to 1.7V VCC across its full industrial temperature range (−40°C to +85°C). Below 1.7V, the internal voltage detector disables write operations to prevent data corruption, though read functionality may remain functional until ~1.5V. This makes the 24AA024H-I/MS suitable for direct integration with 1.8V logic families and energy-harvesting systems without regulation.

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

The 24AA024H-I/MS uses the WP pin to enable hardware write protection for memory addresses 80h–FFh (upper 128 bytes). When WP is tied to VCC, writes to this half-array are blocked - the device acknowledges the command but ignores data. When WP is tied to VSS, full-array writes are permitted. This protection is independent of software commands and remains active even during power transitions, ensuring critical data integrity in the 24AA024H-I/MS.

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

Yes - up to eight 24AA024H-I/MS devices can operate on a single I²C bus using unique slave addresses generated by combinations of the A0, A1, and A2 pins. Each device compares its A2–A0 states to the corresponding bits in the master's control byte (1010 A2 A1 A0 R/W). This allows contiguous 16 Kbit expansion without additional address decoding logic, a key capability of the 24AA024H-I/MS in multi-sensor systems.

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

The 24AA024H-I/MS supports up to 400 kHz I²C clock frequency when VCC is 1.8V or higher. At VCC < 1.8V, the maximum clock rate is limited to 100 kHz to ensure timing margin compliance. These values are specified in the AC Characteristics table of the DS22102A datasheet and apply directly to the 24AA024H-I/MS in its MSOP-8 package configuration.

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

Yes - the 24AA024H-I/MS has open-drain SDA and SCL pins and requires external pull-up resistors to VCC. Recommended values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz, adjusted based on bus capacitance and noise environment. Pull-ups are mandatory for proper I²C bus arbitration and signal integrity; omission will cause communication failure in the 24AA024H-I/MS.