Microchip Technology 24AA01-I/P

Overview

24AA01-I/P from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 400 kHz max clock frequency (100 kHz at V_CC < 2.5V), and industrial temperature range (–40°C to +85°C). It operates down to 1.7V, draws ≤1 µA standby current, and supports 8-byte page writes-used for configuration storage in embedded controllers and sensor calibration data retention.

For engineers reviewing the 24AA01-I/P datasheet, 24AA01-I/P pinout, 24AA01-I/P application, or 24AA01-I/P equivalent, key selection criteria include low-voltage operation (1.7V–5.5V), I²C bus compatibility with Schmitt-trigger inputs, hardware WP pin control, endurance (>1 million cycles), and PDIP-8 packaging for through-hole prototyping and legacy industrial PCBs.

Technical Context

The 24AA01-I/P implements a standard two-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control. Its internal architecture includes an 8-byte page latch, HV generator for EEPROM programming, and memory control logic that manages self-timed erase/write cycles without external timing constraints.

It uses Schmitt-trigger inputs on SDA and SCL for noise immunity, slope-controlled outputs to suppress ground bounce, and supports acknowledge polling to detect write completion. The A0–A2 pins are unconnected and may be left floating or tied to VSS/VCC without functional impact.

Key Specifications

Pinout & Package

24AA01-I/P is supplied in an 8-lead plastic dual in-line package (PDIP), 300 mil body width, with through-hole mounting and industry-standard pin spacing (0.100" pitch). Pin 1 is marked by a notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01B-I/P, the 24AA01-I/P enables lower-voltage operation without sacrificing endurance or retention; versus AT24C01C-PU, it offers proven industrial qualification and simpler address decoding but lacks automotive certification and 1 MHz capability.

Availability

24AA01-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and medical device settings backup requiring stable component supply across extended production lifecycles.

Supply support for 24AA01-I/P 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24AA01 belongs to Microchip's legacy 24XX01 EEPROM product line, designed specifically for cost-sensitive, low-power, I²C-based configuration and calibration storage in industrial, medical, and consumer electronics.

FAQ

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

The 24AA01-I/P supports up to 400 kHz when V_CC is 2.5V–5.5V, and 100 kHz when V_CC is 1.7V–2.5V. This dual-speed capability ensures reliable communication across both modern low-voltage microcontrollers and legacy 5V systems. The 24AA01-I/P automatically adapts to the applied V_CC without external configuration.

Can the A0, A1, and A2 pins on the 24AA01-I/P be left unconnected?

Yes - the A0, A1, and A2 pins on the 24AA01-I/P have no internal connection and serve no functional purpose. They may be left floating, tied to VSS, or tied to VCC without affecting device behavior, addressing, or I²C communication. This simplifies PCB layout and eliminates external pull-up/down requirements.

How does the Write-Protect (WP) pin function on the 24AA01-I/P?

When the WP pin on the 24AA01-I/P is tied to VCC, all write operations to the entire memory array (addresses 00h–7Fh) are inhibited; read operations remain fully functional. When tied to VSS, normal read/write access is enabled. This hardware-level protection prevents accidental or malicious overwrites without software intervention.

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

The 24AA01-I/P guarantees a minimum of 1,000,000 erase/write cycles and data retention exceeding 200 years at 25°C. These specifications are validated per JEDEC standards and apply across the full industrial temperature range (–40°C to +85°C), making the 24AA01-I/P suitable for applications requiring long-term field reliability without maintenance.

Does the 24AA01-I/P support page write operations, and what is the page size?

Yes - the 24AA01-I/P supports 8-byte page writes, allowing up to eight sequential bytes to be loaded into the internal page buffer and written simultaneously upon receipt of a STOP condition. Page boundaries align to 00h–07h, 08h–0Fh, etc.; crossing a boundary causes wraparound within the same page, so software must manage address alignment.