Microchip Technology 24AA01T-I/MC

Overview

24AA01T-I/MC 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 supports up to 400 kHz clock frequency (100 kHz at V_CC < 2.5V), delivers ≤1 µA standby current, and targets low-power embedded systems requiring nonvolatile parameter storage.

For engineers reviewing the 24AA01T-I/MC datasheet, 24AA01T-I/MC pinout, 24AA01T-I/MC application, or 24AA01T-I/MC equivalent, key selection criteria include I²C voltage compatibility (1.7–5.5V), industrial temperature range (–40°C to +85°C), DFN-8 package footprint, WP-controlled write protection, and 1 million endurance cycles with >200-year data retention.

Technical Context

The 24AA01T-I/MC implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while ACK polling allows host-driven timing control during self-timed 5 ms write cycles.

It uses an on-chip HV generator for EEPROM programming and features three unconnected address pins (A0–A2), making it functionally identical across all device addresses in the 24XX01 family. The device operates as a slave client under host-generated SCL and Start/Stop conditions per I²C protocol.

Key Specifications

Pinout & Package

24AA01T-I/MC is housed in an 8-lead 2×3 mm DFN package (Microchip drawing C04-2061-LT Rev E) with exposed pad (optional V_SS connection or floating). Pin 1 = A0 (NC), Pin 2 = A1 (NC), Pin 3 = A2 (NC), Pin 4 = V_SS, Pin 5 = SDA, Pin 6 = SCL, Pin 7 = WP, Pin 8 = V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01T-I/MC, the 24LC01B-I/MC excludes 1.8V operation but offers identical industrial-temperature reliability, while AT24C01D-SSHM-T adds speed and flexible protection at the cost of increased firmware dependency and potential signal integrity trade-offs.

Availability

24AA01T-I/MC is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, smart energy metering, and automotive body control modules requiring stable component supply, long-life data retention, and low-voltage I²C compatibility.

Supply support for 24AA01T-I/MC 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 for embedded control applications.

The 24AA01T-I/MC belongs to Microchip's 24XX01 family of I²C EEPROMs, designed specifically for cost-sensitive, low-power systems needing reliable nonvolatile storage with minimal board space and firmware overhead.

FAQ

What is the operating voltage range of the 24AA01T-I/MC?

The 24AA01T-I/MC operates from 1.7V to 5.5V, enabling direct interfacing with 1.8V, 3.3V, and 5V microcontrollers. At V_CC < 2.5V, maximum I²C clock frequency is limited to 100 kHz to ensure timing margin; above 2.5V, it supports up to 400 kHz. This wide range makes 24AA01T-I/MC suitable for mixed-voltage designs without level shifters.

How does the Write-Protect (WP) pin function on the 24AA01T-I/MC?

When the WP pin of the 24AA01T-I/MC is tied to V_CC, all write operations to the entire 128-byte memory array (addresses 00h–7Fh) are inhibited; reads remain fully functional. When WP is tied to V_SS, normal read/write access is enabled. This hardware-level protection prevents accidental overwrites during power-up, reset, or firmware errors - a critical feature for safety-critical or field-updated systems.

What is the maximum write cycle time for the 24AA01T-I/MC, and how can hosts manage it?

The 24AA01T-I/MC has a maximum write cycle time of 5 ms for both byte and page writes. Hosts can detect completion via ACK polling: after issuing a Stop condition, the host sends a repeated Start + write address (R/W = 0); absence of ACK indicates ongoing write, while ACK confirms readiness. This eliminates fixed delays and maximizes I²C bus utilization in time-sensitive applications.

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

Yes, the 24AA01T-I/MC requires external pull-up resistors on both SDA and SCL because its I/O pins are open-drain. Recommended values are 10 kΩ for 100 kHz operation, 2 kΩ for 400 kHz, and lower values for marginal noise environments. Pull-ups must connect to the same V_CC rail used by the 24AA01T-I/MC to maintain valid logic levels and avoid bus contention.

What package type is used for the 24AA01T-I/MC, and what are its key mechanical features?

The 24AA01T-I/MC uses an 8-lead 2×3 mm DFN package (Microchip drawing C04-2061-LT Rev E) with an exposed thermal pad. Pin 1 is A0 (no internal connection), and the package supports reflow soldering per J-STD-020. The exposed pad may be connected to V_SS for improved thermal performance or left floating; board layout must follow Microchip's recommended land pattern to ensure reliable solder joint formation and mechanical stability.