Microchip Technology 24AA02HT-I/SN

Overview

24AA02HT-I/SN 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 to 5.5V operation, and industrial temperature range (–40°C to +85°C). It features Schmitt-trigger inputs, slope-controlled outputs, 8-byte page write buffer, and supports up to 400 kHz clock frequency at V_CC ≥ 2.5V.

For engineers reviewing the 24AA02HT-I/SN datasheet, 24AA02HT-I/SN pinout, 24AA02HT-I/SN application, or 24AA02HT-I/SN equivalent, key selection criteria include low-voltage operation down to 1.7V, half-array hardware write-protection via WP pin, 1 µA standby current, 1 million erase/write cycles, and SOIC-8 narrow (SN) package compatibility with standard PCB land patterns.

Technical Context

The 24AA02HT-I/SN implements a two-wire I²C interface with fixed 7-bit client address (1010xxxR/W), where A0–A2 pins are unconnected and may be left floating or tied to VSS/VCC. Its internal Address Pointer auto-increments during sequential reads and page writes, enabling efficient block access without repeated address transmission.

Write protection is implemented via the WP pin: when tied to VCC, addresses 80h–FFh are write-inhibited while reads remain fully functional; when tied to VSS, full array read/write is enabled. The device uses self-timed erase/write cycles with 5 ms maximum byte/page write time and supports acknowledge polling to detect write completion without fixed delays.

Key Specifications

Pinout & Package

24AA02HT-I/SN is supplied in an 8-lead plastic small outline (SOIC) package, narrow body (3.90 mm), designated SN per Microchip's packaging nomenclature. Pin 1 is marked with a notch or dot; the package complies with JEDEC MS-012AA and has 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02BHT-I/SN, the 24AA02HT-I/SN enables true 1.8V system integration, while AT24C02D-SSHM-T trades endurance for cost-making the 24AA02HT-I/SN optimal for low-voltage, high-reliability applications demanding full 1M-cycle longevity.

Availability

24AA02HT-I/SN is available at Aetrix Electronics and suitable for network infrastructure, industrial automation, automotive electronics, and medical diagnostics requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for 24AA02HT-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, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24AA02H family was designed specifically for secure, low-power, I²C-based nonvolatile storage of critical identification and configuration data in resource-constrained embedded systems.

FAQ

What is the operating voltage range of the 24AA02HT-I/SN?

The 24AA02HT-I/SN operates from 1.7V to 5.5V, making it compatible with 1.8V, 3.3V, and 5V logic systems. This wide range eliminates the need for level shifters in mixed-voltage designs and supports direct connection to modern ultra-low-power microcontrollers. The 24AA02HT-I/SN maintains full I²C functionality-including 400 kHz operation-at V_CC ≥ 2.5V, and degrades gracefully to 100 kHz below 2.5V.

How does the write-protect (WP) pin function on the 24AA02HT-I/SN?

The WP pin on the 24AA02HT-I/SN provides hardware-level write protection: when tied to VCC, writes to memory addresses 80h–FFh (upper 1 Kbit) are inhibited while reads remain fully accessible; when tied to VSS, full-array read/write is enabled. This feature is critical for safeguarding immutable data such as MAC addresses or calibration constants. The 24AA02HT-I/SN does not require software commands or register writes to activate protection-only a simple external voltage level.

Is the 24AA02HT-I/SN pin-compatible with other SOIC-8 EEPROMs?

Yes, the 24AA02HT-I/SN uses standard SOIC-8 narrow (SN) pinout per JEDEC MS-012AA, matching industry-standard footprints including those of 24LC02BHT-I/SN and AT24C02D-SSHM-T. Pin assignments (VSS, SDA, SCL, WP, VCC, and unused A0–A2) are identical across these parts, enabling mechanical and layout compatibility. However, electrical differences-such as voltage range and endurance-must be verified before substitution.

What is the maximum write cycle time for the 24AA02HT-I/SN?

The maximum write cycle time for the 24AA02HT-I/SN is 5 ms for both byte and page writes. This self-timed internal cycle begins after the host issues a STOP condition and cannot be interrupted. During this period, the device does not acknowledge I²C requests-a behavior leveraged by acknowledge polling to detect completion. The 24AA02HT-I/SN's 5 ms specification is guaranteed across its full industrial temperature range (–40°C to +85°C) and supply voltage range (1.7V–5.5V).

Does the 24AA02HT-I/SN support AEC-Q100 qualification?

Yes, the 24AA02HT-I/SN is AEC-Q100 qualified for automotive applications. This qualification covers stress testing for temperature cycling, humidity, solderability, and ESD robustness, confirming suitability for under-hood and body-control module deployments. The "I" in the part number denotes Industrial temperature grade (–40°C to +85°C), which aligns with AEC-Q100 Grade 2 requirements. Full qualification documentation is available in Microchip's official AEC-Q100 report for the 24AA02H family.