Microchip Technology 24AA01T-I/MS

Overview

24AA01T-I/MS from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory, operating from 1.7V to 5.5V with 400 kHz max clock frequency, 1 µA standby current, and industrial temperature range (–40°C to +85°C). It features hardware write-protection via the WP pin and supports up to 8-byte page writes for embedded system configuration storage in microcontroller-based sensors.

For engineers reviewing the 24AA01T-I/MS datasheet, 24AA01T-I/MS pinout, 24AA01T-I/MS application, or 24AA01T-I/MS equivalent, key selection criteria include low-voltage operation down to 1.7V, Schmitt-trigger noise immunity on SDA/SCL, 1 million endurance cycles, 200-year data retention, and MSOP-8 packaging compatibility with space-constrained PCB layouts.

Technical Context

The 24AA01T-I/MS implements a standard two-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control, supporting byte and page write modes. Its internal architecture includes an 8-byte page latch, EEPROM array with HV generator, and memory control logic that manages self-timed erase/write cycles without external timing components.

It uses open-drain SDA/SCL with internal Schmitt triggers and slope control to suppress ground bounce and bus noise. Write protection is implemented via a dedicated WP input pin tied to VCC for full-array lockout, and the A0–A2 pins are unconnected - electrically isolated and may be left floating or tied to VSS/VCC without functional impact.

Key Specifications

Pinout & Package

24AA01T-I/MS is supplied in an 8-lead MSOP package (Micro Small Outline Package), measuring 3.0 mm × 3.0 mm × 1.0 mm with 0.65 mm lead pitch. The package is RoHS-compliant and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01B-I/MS, the 24AA01T-I/MS enables lower-voltage operation critical for battery-powered devices, while AT24C01D-MAHM-T offers higher bandwidth but demands layout changes - making 24AA01T-I/MS optimal for space-constrained, 1.7V–5.5V industrial edge nodes requiring proven reliability and drop-in MSOP-8 fit.

Availability

24AA01T-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device serialization, and consumer appliance settings backup requiring stable component supply across extended production lifecycles.

Supply support for 24AA01T-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA01T-I/MS belongs to Microchip's 24XX01 family of serial EEPROMs, designed specifically for reliable, low-power nonvolatile storage in cost-sensitive, space-constrained embedded systems across industrial, medical, and consumer markets.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA01T-I/MS?

The 24AA01T-I/MS operates reliably down to 1.7V across its full industrial temperature range (–40°C to +85°C), enabling direct integration with 1.8V logic families and battery-powered systems where brownout resilience is essential. This specification is validated per Microchip DS20001711M, Section 1.0 Electrical Characteristics.

Does the 24AA01T-I/MS require external pull-up resistors on the SDA and SCL lines?

Yes, the 24AA01T-I/MS has open-drain SDA and SCL outputs and requires external pull-up resistors to VCC. For 400 kHz operation, a 2 kΩ resistor is recommended; for 100 kHz, 10 kΩ is typical. These values ensure proper rise time and noise margin per I²C bus specifications and Microchip's AC timing requirements.

How does the WP pin function on the 24AA01T-I/MS, and what happens when it is tied to VCC?

When the WP pin of the 24AA01T-I/MS is tied to VCC, the entire memory array (addresses 00h–7Fh) becomes write-protected - all write commands (byte and page) are ignored, though read operations remain fully functional. This hardware-level lock prevents accidental or malicious firmware corruption without consuming MCU resources or requiring software intervention.

What is the maximum number of bytes that can be written in a single page write operation for the 24AA01T-I/MS?

The 24AA01T-I/MS supports an 8-byte page write buffer, allowing up to eight consecutive bytes to be loaded into the internal latch before initiating the self-timed write cycle. Attempting to write more than eight bytes before issuing a Stop condition causes address pointer rollover and overwrites earlier data within the same physical page boundary.

Is the 24AA01T-I/MS qualified for automotive applications under AEC-Q100?

No, the 24AA01T-I/MS is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. While the broader 24XX01 family includes AEC-Q100 qualified variants (e.g., 24AA01HT-I/MS), the 24AA01T-I/MS part number itself carries no automotive qualification - users requiring automotive-grade reliability must select explicitly qualified alternatives.