Microchip Technology 24AA01HT-I/LT

Overview

24AA01HT-I/LT from Microchip Technology Inc. is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM optimized for ultra-low-voltage operation down to 1.7 V, with max read current of 1 mA and standby current of 1 μA over –40°C to +85°C. It features hardware write-protect for the upper half-array (40h–7Fh), page-write capability (up to 8 bytes), and Schmitt-trigger inputs for noise immunity - deployed in embedded system configuration storage, sensor calibration data retention, and industrial control parameter backup.

For engineers reviewing the 24AA01HT-I/LT datasheet, 24AA01HT-I/LT pinout, 24AA01HT-I/LT application, or 24AA01HT-I/LT equivalent, this page delivers verified electrical specs, validated 5-pin SOT-23 terminal mapping, confirmed I²C timing compliance (100/400 kHz), endurance (1M cycles), and data retention (>200 years) - all specific to the 24AA01HT-I/LT variant with Industrial temperature grade and tape-and-reel packaging.

Technical Context

The 24AA01HT-I/LT implements a fixed 1 Kbit memory array organized as one block of 128 × 8-bit locations, accessed via standard two-wire I²C protocol using slave address prefix '1010' with R/W bit. Its internal address pointer auto-increments during sequential reads and page writes, supporting current-address, random, and sequential read modes without external address latching.

It integrates on-chip voltage threshold detection disabling erase/write logic below 1.5 V, plus input filtering (50 ns spike suppression) and slope-controlled outputs to suppress ground bounce - enabling robust operation in electrically noisy industrial environments where supply stability and bus integrity are critical.

Key Specifications

Pinout & Package

24AA01HT-I/LT uses the 5-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and Pb-free matte tin plating. Pin 1 is marked by a dot; pin numbering follows standard SOT-23 orientation (viewed top-down, left-to-right: pins 1–3 on bottom row, pins 4–5 on top row).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BHT-I/LT, the 24AA01HT-I/LT enables true 1.7 V operation critical for battery longevity; compared with AT24C01D-SSHM-T, it provides identical functionality at lower cost and smaller footprint for non-automotive industrial applications - making it the preferred choice for general-purpose low-voltage EEPROM needs.

Availability

24AA01HT-I/LT is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and smart home actuator configuration requiring stable component supply, long-term data retention, and low-voltage I²C compatibility.

Supply support for 24AA01HT-I/LT 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, manufacturing, and sales operations.

The 24AA01H family was designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal external components - targeting industrial controls, consumer electronics, and IoT edge devices.

FAQ

What is the minimum operating voltage for the 24AA01HT-I/LT?

The 24AA01HT-I/LT operates down to 1.7 V, with full I²C functionality and guaranteed 1 μA standby current across the industrial temperature range (–40°C to +85°C). Below 1.7 V, the internal voltage detector disables write operations to prevent data corruption, though read access may remain functional depending on process variation.

Does the 24AA01HT-I/LT support page writes, and what is the maximum page size?

Yes, the 24AA01HT-I/LT supports page writes of up to 8 bytes per transaction. The internal page buffer holds these bytes until a Stop condition is issued, after which they are written atomically into contiguous memory locations - provided the write does not cross a physical page boundary (addresses 00h–07h, 08h–0Fh, etc.).

How is write protection implemented on the 24AA01HT-I/LT?

Write protection on the 24AA01HT-I/LT is controlled by the WP pin: when tied to V_CC, addresses 40h–7Fh (upper half-array) become read-only; when tied to V_SS, full read/write access is enabled. Pins A0–A2 are unconnected and may be left floating or tied to any rail without effect.

What package type and lead count does the 24AA01HT-I/LT use?

The 24AA01HT-I/LT uses the 5-lead SOT-23 package (JEDEC MO-178AA), with pinout: Pin 1 = SCL, Pin 2 = V_SS, Pin 3 = SDA, Pin 4 = V_CC, Pin 5 = WP. This compact, surface-mount package supports automated assembly and fits tight-layout applications.

Is the 24AA01HT-I/LT compatible with standard I²C bus speeds and protocols?

Yes, the 24AA01HT-I/LT is fully compatible with standard I²C protocols, supporting 100 kHz (at 1.7–2.49 V) and 400 kHz (at 2.5–5.5 V) clock frequencies. It responds to slave address '1010xxx0' (write) and '1010xxx1' (read), with 'xxx' as don't-care bits, and implements ACK polling for write-cycle completion detection.