Microchip Technology 24AA01-I/MS

Overview

24AA01-I/MS from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 8-byte page write buffer, and operation down to 1.7V. It features Schmitt-trigger inputs, slope-controlled outputs, and supports up to 400 kHz clock frequency at industrial temperature range (–40°C to +85°C). Used in embedded system configuration storage where low-voltage operation and data retention >200 years are critical.

For engineers reviewing the 24AA01-I/MS datasheet, 24AA01-I/MS pinout, 24AA01-I/MS application, or 24AA01-I/MS equivalent, this page delivers verified electrical specs, MSOP-8 package layout, I²C timing compliance, endurance (1M cycles), and real-world use cases for firmware parameter storage, calibration data retention, and secure boot configuration.

Technical Context

The 24AA01-I/MS implements a 2-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, HV generator for EEPROM programming, and memory control logic that enforces self-timed erase/write cycles without external timing components.

It uses Schmitt-trigger inputs on SDA/SCL for noise immunity and output slope control to suppress ground bounce. Write protection is implemented via dedicated WP pin tied to VCC (full array protected) or VSS (enabled), with no internal connection to A0–A2 pins-these are NC and may be left floating or tied.

Key Specifications

Pinout & Package

24AA01-I/MS is supplied in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm pitch, body dimensions 3.0 mm × 3.0 mm × 1.1 mm, and exposed pad option (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01B-I/MS, 24AA01-I/MS enables true single-cell operation and broader voltage flexibility; versus 24FC01-I/MS, it trades maximum speed for proven stability at 400 kHz in noise-sensitive environments-making it optimal for cost-sensitive, low-power industrial nodes.

Availability

24AA01-I/MS is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, and smart meter firmware parameter sets requiring stable component supply, long-life data retention, and RoHS-compliant packaging.

Supply support for 24AA01-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 components, and memory solutions, serving industrial, automotive, and consumer markets with vertically integrated silicon and development tools.

The 24AA01 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile storage in space- and energy-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24AA01-I/MS?

The 24AA01-I/MS supports up to 400 kHz when VCC is 2.5V or higher. At VCC between 1.7V and 2.5V, the maximum clock frequency is reduced to 100 kHz to ensure reliable timing margins. This dual-speed capability allows flexible integration across diverse power domains while maintaining I²C protocol compliance.

Does the 24AA01-I/MS require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA01-I/MS has open-drain SDA and input-only SCL pins, so external pull-up resistors are mandatory. For 400 kHz operation, a 2 kΩ resistor to VCC is recommended; for 100 kHz, 10 kΩ is typical. Incorrect pull-up values can cause bus contention, ACK failures, or timing violations per I²C specification.

How does the WP pin function on the 24AA01-I/MS?

When WP is tied to VCC, the entire 128-byte memory array (addresses 00h–7Fh) is write-protected-reads remain enabled, but all write commands (byte or page) are ignored. When WP is tied to VSS, full read/write access is granted. The pin has no internal connection to A0–A2, which are unconnected.

Can the 24AA01-I/MS operate from a 1.8V supply?

Yes, the 24AA01-I/MS is fully specified for operation from 1.7V to 5.5V, making it compatible with 1.8V logic systems. At 1.8V, it operates at 100 kHz maximum I²C clock rate and maintains 1 µA standby current and 1 mA read current-ideal for ultra-low-power applications.

What is the endurance and data retention specification for the 24AA01-I/MS?

The 24AA01-I/MS guarantees 1,000,000 erase/write cycles and greater than 200 years of data retention at +85°C. These specifications are tested per JEDEC standards and apply across the full industrial temperature range (–40°C to +85°C), ensuring long-term reliability in demanding deployments.