Microchip Technology 24AA01HT-I/MS

Overview

24AA01HT-I/MS from Microchip Technology Inc. is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM designed for low-voltage embedded systems. It operates from 1.7V to 5.5V, supports up to 400 kHz clock frequency, features hardware write-protect for the upper half-array (40h–7Fh), and delivers ≤1 μA standby current at industrial temperature (−40°C to +85°C). It is commonly used in firmware storage, calibration data retention, and configuration memory in sensor modules and industrial controllers.

For engineers reviewing the 24AA01HT-I/MS datasheet, 24AA01HT-I/MS pinout, 24AA01HT-I/MS application, or 24AA01HT-I/MS equivalent, key selection considerations include its 1.7V minimum VCC, half-array hardware write-protection via WP pin, MSOP-8 package footprint, guaranteed 1 million erase/write cycles, and compatibility with standard I²C bus timing including Schmitt-trigger noise suppression on SDA/SCL.

Technical Context

The 24AA01HT-I/MS implements a slave-only I²C interface with fixed 7-bit device address (1010xxx), where the three A0–A2 pins are unconnected and may be left floating. Its internal architecture includes an 8-byte page buffer, address pointer auto-increment, and VCC threshold detector that disables write operations below ~1.5V.

Write protection is implemented via the WP pin: tied to VSS enables full-array writes; tied to VCC locks addresses 40h–7Fh while permitting reads and writes to 00h–3Fh. All I/O pins feature Schmitt-trigger inputs and output slope control to suppress ground bounce and bus noise.

Key Specifications

Pinout & Package

24AA01HT-I/MS is housed in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body, and exposed pad option not applicable. Pin 1 is marked by a dot or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01HT-I/MS, the 24LC01BHT-I/MS offers identical form/fit/function above 2.5V but excludes ultra-low-voltage capability, while the AT24C01D-MAHM-T adds address pin flexibility at the cost of losing hardware-based memory segmentation protection.

Availability

24AA01HT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, smart meter firmware patch storage, and automotive body control module settings requiring stable component supply across extended production lifecycles.

Supply support for 24AA01HT-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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA01HT-I/MS belongs to Microchip's 24XX01H family of ultra-low-voltage I²C EEPROMs, engineered specifically for reliable nonvolatile storage in battery-powered, energy-constrained, and wide-temperature industrial and medical applications.

FAQ

What is the function of the A0, A1, and A2 pins on the 24AA01HT-I/MS?

The A0, A1, and A2 pins on the 24AA01HT-I/MS are not internally connected and serve no functional purpose. They may be left floating or tied to VSS or VCC without affecting device operation. This simplifies PCB layout and eliminates address configuration overhead, distinguishing the 24AA01HT-I/MS from higher-density EEPROMs that use these pins for device addressing.

How does the WP pin protect memory on the 24AA01HT-I/MS?

When the WP pin on the 24AA01HT-I/MS is driven high (VCC), write operations to memory addresses 40h–7Fh are disabled - only addresses 00h–3Fh remain writable. When WP is low (VSS), full-array writes are permitted. This hardware-level protection prevents accidental overwrites of critical calibration or security data without requiring firmware intervention.

Can the 24AA01HT-I/MS operate reliably at 1.8V?

Yes, the 24AA01HT-I/MS is fully specified to operate from 1.7V to 5.5V. At 1.8V, it supports I²C communication at up to 100 kHz, maintains ≤1 μA standby current, and retains full write endurance and data retention specifications - making it ideal for modern 1.8V microcontroller interfaces without level translation.

What is the maximum write speed for page operations on the 24AA01HT-I/MS?

The 24AA01HT-I/MS supports page writes of up to 8 bytes per command, with a typical internal write cycle time of 3 ms. Because the device uses an on-chip page buffer, sending multiple bytes before issuing a Stop condition reduces total programming time versus byte-by-byte writes - critical for minimizing host MCU blocking in real-time systems.

Is the 24AA01HT-I/MS RoHS compliant and Pb-free?

Yes, the 24AA01HT-I/MS is Pb-free and RoHS compliant per Microchip's DS22104A documentation. The MSOP-8 package uses matte tin (Sn) plating per JEDEC standards, and full compliance information - including material declarations and test reports - is available through Microchip's official product page and Aetrix Electronics' traceable sourcing records.