Microchip Technology 24AA024H-I/SN

Overview

24AA024H-I/SN 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. It is used in embedded systems for storing calibration data, configuration parameters, and device identifiers.

For engineers reviewing the 24AA024H-I/SN datasheet, 24AA024H-I/SN pinout, 24AA024H-I/SN application, or 24AA024H-I/SN equivalent, key selection considerations include its 1.7V minimum VCC, 400 kHz I²C clock support, 1 μA standby current, and half-array hardware write protection - critical for low-power, tamper-resilient firmware storage in industrial controllers and sensor nodes.

Technical Context

The 24AA024H-I/SN implements a standard two-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 pointer auto-increments during sequential reads and supports current-address, random, and sequential read modes.

Write operations use an on-chip 16-byte page buffer and self-timed erase/write cycle (max 5 ms), with acknowledge polling supported to detect write completion. Hardware write protection is controlled solely by the WP pin state - tied to VCC to lock addresses 80h–FFh, independent of software commands.

Key Specifications

Pinout & Package

24AA024H-I/SN is supplied in an 8-pin SOIC (150 mil) package, pin-compatible with PDIP, TSSOP, MSOP, and TDFN variants. All packages share identical pin functions and numbering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC024HT-I/SN and AT24C02D-SSHM-T, the 24AA024H-I/SN uniquely combines ultra-low-voltage operation (1.7V), industrial-temp-rated 400 kHz I²C, and dedicated hardware write protection - making it optimal for battery-powered, safety-aware, and mixed-voltage embedded designs where robustness trumps raw speed.

Availability

24AA024H-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, smart meter firmware metadata, and automotive body control module applications requiring stable component supply across extended lifecycles.

Supply support for 24AA024H-I/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 microcontroller, analog, FPGA, 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 cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal external components and robust noise immunity.

FAQ

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

The 24AA024H-I/SN operates reliably down to 1.7V across its full industrial temperature range (–40°C to +85°C). Below 1.8V, maximum I²C clock frequency is limited to 100 kHz to ensure timing margin. This 1.7V capability allows direct integration with 1.8V logic families and extends battery runtime in energy-constrained applications. The 24AA024H-I/SN includes an internal VCC threshold detector that disables write operations if VCC drops below ~1.5V, preventing corrupted data writes.

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

Hardware write protection on the 24AA024H-I/SN is controlled exclusively by the WP pin: when tied to VCC, addresses 80h–FFh (upper 128 bytes) are locked against all write and page-write commands, regardless of software state. No command or sequence can override this protection. The lower 128 bytes (00h–7Fh) remain fully writable. If WP is tied to VSS, write protection is disabled entirely. This pin-level enforcement provides deterministic, fail-safe protection for critical firmware metadata stored in the upper half-array.

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

Yes - up to eight 24AA024H-I/SN devices can coexist on a single I²C bus using the A0, A1, and A2 address-select pins. Each device's 7-bit slave address is formed as '1010' followed by the logic levels on A2–A0, yielding addresses 1010000x through 1010111x. All pins must be statically tied to VSS or VCC (not floated or driven dynamically during operation). This enables scalable memory expansion up to 16 Kbits (eight × 2 Kbit) with contiguous addressing support in software.

What is the maximum write cycle time for the 24AA024H-I/SN?

The maximum write cycle time for the 24AA024H-I/SN is 5 ms for both byte and page writes, as specified in the datasheet (parameter TWC). This self-timed duration includes internal auto-erase and programming phases. During this period, the device does not acknowledge I²C start conditions or control bytes - a behavior leveraged by acknowledge polling to detect write completion. The 5 ms value is guaranteed across the full VCC and temperature range; no derating is required for industrial conditions.

Does the 24AA024H-I/SN support 1 MHz I²C communication?

No - the 24AA024H-I/SN supports up to 400 kHz I²C clock frequency at VCC ≥ 1.8V, and only 100 kHz below 1.8V. The 1 MHz rating applies exclusively to the 24LC024H variant (which requires minimum 2.5V VCC). Attempting 1 MHz operation on the 24AA024H-I/SN will violate AC timing specifications (e.g., THIGH, TLOW, TR/TF), resulting in unreliable communication or bus lockup. Designers requiring 1 MHz should select 24LC024H or alternative EEPROMs explicitly rated for fast-mode plus.