Microchip Technology 24AA01-I/SN

Overview

24AA01-I/SN 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 for embedded configuration storage in microcontroller-based systems.

For engineers reviewing the 24AA01-I/SN datasheet, 24AA01-I/SN pinout, 24AA01-I/SN application, or 24AA01-I/SN equivalent, this page delivers verified electrical specs, SOIC-8 package layout, I²C timing constraints, endurance (1M cycles), and real-world use cases in power management, sensor calibration, and firmware parameter retention.

Technical Context

The 24AA01-I/SN 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 the 8-byte page buffer allows burst writes within a single physical page boundary (00–7F hex).

Write protection is controlled solely by the WP pin: tied to VSS for full read/write access, or to VCC to lock the entire 128-byte array. The device uses an on-chip high-voltage generator for erase/write operations and requires no external programming voltage.

Key Specifications

Pinout & Package

24AA01-I/SN is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package (SN suffix), measuring 3.90 mm wide with standard 1.27 mm pitch. Pin 1 is marked with a beveled corner or dot; A0–A2 are no-connect pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01B-I/SN, the 24AA01-I/SN extends operational voltage down to 1.7V for broader MCU compatibility, while AT24C01D-SSHM-T offers alternate sourcing without AEC-Q100 or factory programming-making 24AA01-I/SN optimal for industrial and automotive-adjacent designs requiring guaranteed low-voltage operation and qualification.

Availability

24AA01-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, power management unit configuration, and consumer appliance settings retention requiring stable component supply and long-term obsolescence management.

Supply support for 24AA01-I/SN 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 infrastructure.

The 24AA01 belongs to Microchip's legacy 24XX01 family of I²C EEPROMs, engineered for reliable, low-power nonvolatile storage in space-constrained embedded systems where simplicity, endurance, and industrial temperature operation are critical.

FAQ

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

The 24AA01-I/SN supports up to 400 kHz when V_CC is 2.5V or higher. At V_CC between 1.7V and 2.5V, the maximum clock frequency drops to 100 kHz per DS20001711M specification. This voltage-dependent limitation ensures signal integrity and timing margin compliance across its full operating range. The 24AA01-I/SN does not support 1 MHz operation-that capability is exclusive to the 24FC01 variant.

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

The WP (Write-Protect) pin on the 24AA01-I/SN is a dedicated hardware enable/disable control: tying it to VSS permits full read/write access to the entire 128-byte memory array (addresses 00–7F), while connecting it to VCC locks all write operations permanently-reads remain fully functional. No internal pull-up or pull-down exists; external connection is mandatory for deterministic behavior. This feature is implemented entirely in silicon and requires no firmware intervention.

Are the A0, A1, and A2 pins functional on the 24AA01-I/SN?

No-the A0, A1, and A2 pins on the 24AA01-I/SN are not internally connected and serve no functional purpose. They may be left floating, tied to VSS, or tied to VCC without affecting device operation. This differs from higher-density variants (e.g., 24AA02) where these pins encode I²C slave addresses. The 24AA01-I/SN uses a fixed 4-bit device code (1010) with three "don't care" bits, resulting in a single hardwired I²C address (0xA0 for write, 0xA1 for read).

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

The 24AA01-I/SN is rated for 1,000,000 erase/write cycles at 25°C and 5.5V (page mode), with data retention exceeding 200 years under normal operating conditions. These figures are characterized and guaranteed per Microchip's DS20001711M datasheet-not typical estimates. Endurance degrades predictably at elevated temperatures or voltages, but the 24AA01-I/SN maintains full specification compliance across its industrial temperature range (–40°C to +85°C).

Does the 24AA01-I/SN support page writes, and what is the page size?

Yes, the 24AA01-I/SN supports page writes with an 8-byte buffer. A single page write command can load up to eight consecutive bytes into the on-chip latch before initiating the internal 5 ms self-timed write cycle. Physical page boundaries align to 8-byte intervals (e.g., addresses 00–07, 08–0F), and crossing a boundary causes wraparound within the current page-not automatic advancement to the next page. This behavior is explicitly documented in Figure 6-1 and Section 6.2 of the 24AA01-I/SN datasheet.