Microchip Technology 24AA01T-I/SN

Overview

24AA01T-I/SN from Microchip Technology is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 400 kHz max clock frequency at 2.5–5.5 V, and industrial temperature range (−40°C to +85°C). It supports page writes up to 8 bytes, operates down to 1.7 V, and delivers ≤1 µA standby current - ideal for low-power embedded configuration storage in sensor nodes and portable medical devices.

For engineers reviewing the 24AA01T-I/SN datasheet, 24AA01T-I/SN pinout, 24AA01T-I/SN application, or 24AA01T-I/SN equivalent, key selection criteria include I²C voltage compatibility (1.7–5.5 V), WP-enabled hardware lock, 8-byte page buffer efficiency, and SOIC-8 (SN) package suitability for space-constrained PCB layouts.

Technical Context

The 24AA01T-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 auto-increments during sequential reads, enabling full 128-byte memory access per transaction without re-addressing.

It uses an on-chip high-voltage generator for EEPROM programming and features self-timed erase/write cycles with 5 ms maximum page write time. Write protection is implemented via dedicated WP pin logic - tied to VCC to disable all writes while preserving read functionality across the entire 00h–7Fh address space.

Key Specifications

Pinout & Package

24AA01T-I/SN is packaged in an 8-lead SOIC (SN) with 1.27 mm pitch. Pin 1 is A0 (no internal connection); pins A0–A2 are NC and may be left floating or tied to VSS/VCC. The exposed pad is not present in SOIC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01B-I/SN, the 24AA01T-I/SN enables lower-voltage operation critical for modern ultra-low-power designs; compared with AT24C01D-SSHM-T, it offers deterministic hardware-level write blocking independent of MCU state or firmware integrity.

Availability

24AA01T-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, IoT edge node identity, and automotive body control modules requiring stable component supply and long-term obsolescence management.

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

The 24AA01T-I/SN belongs to Microchip's serial EEPROM product line, engineered for reliable, low-power nonvolatile data storage in space- and power-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the maximum I²C clock frequency supported by the 24AA01T-I/SN?

The 24AA01T-I/SN supports up to 400 kHz I²C clock frequency when VCC is 2.5 V or higher. At VCC between 1.7 V and 2.5 V, the maximum clock frequency drops to 100 kHz to ensure timing margin compliance. This dual-speed capability allows flexible integration across diverse voltage domains without redesigning the I²C bus infrastructure. The 24AA01T-I/SN maintains full functionality across both ranges.

How does the WP pin function on the 24AA01T-I/SN?

The WP (Write-Protect) pin on the 24AA01T-I/SN provides hardware-level write inhibition. When tied to VCC, all write operations to the entire 128-byte memory array (addresses 00h–7Fh) are blocked, while read operations remain fully functional. When tied to VSS, normal read/write access is enabled. This pin operates independently of firmware, offering fail-safe protection against accidental or malicious overwrites. The 24AA01T-I/SN requires no internal configuration to activate this feature.

Is the 24AA01T-I/SN compatible with 1.8 V microcontrollers?

Yes, the 24AA01T-I/SN is fully compatible with 1.8 V microcontrollers. Its 1.7–5.5 V supply range and I²C interface with Schmitt-trigger inputs allow direct connection to 1.8 V I/O domains without level-shifting circuitry. The device meets I²C specification voltage thresholds at 1.8 V, and its 1 µA standby current minimizes impact on battery life. This makes the 24AA01T-I/SN ideal for ultra-low-power applications where the 24AA01T-I/SN serves as persistent configuration storage.

What is the page write capability of the 24AA01T-I/SN?

The 24AA01T-I/SN features an 8-byte page write buffer, allowing up to eight consecutive bytes to be written in a single I²C transaction. This reduces bus overhead and host CPU intervention compared to byte-wise writes. Page writes must remain within physical page boundaries (00h–07h, 08h–0Fh, etc.); crossing boundaries causes wraparound. The 24AA01T-I/SN completes each page write in ≤5 ms, and the internal write cycle is self-timed - no external delay is needed before initiating the next command.

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

Yes, the 24AA01T-I/SN requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz. These resistors establish valid high logic levels and ensure proper signal rise times per I²C specification. The 24AA01T-I/SN does not include internal pull-ups, so omission will result in bus failure. Pull-up voltage must match the VCC domain of the I²C master.