Microchip Technology 24AA32AT-I/SN

Overview

24AA32AT-I/SN from Microchip Technology is a 32-Kbit I²C serial EEPROM organized as 4K × 8-bit memory, operating from 1.7V to 5.5V with 1 µA standby current and 400 kHz max clock frequency. It features hardware write-protection (WP pin), 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity - deployed in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the 24AA32AT-I/SN datasheet, 24AA32AT-I/SN pinout, 24AA32AT-I/SN application, or 24AA32AT-I/SN equivalent, key selection criteria include low-voltage operation down to 1.7V, I²C bus compatibility at 100/400 kHz, industrial temperature range (-40°C to +85°C), and SOIC-8 package footprint with verified A0–A2 address pin mapping.

Technical Context

The 24AA32AT-I/SN implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, supporting standard-mode (100 kHz) and fast-mode (400 kHz) timing per SMBus v2.0. Its internal architecture includes a 32-byte page latch, address pointer auto-increment, and on-chip HV generator for EEPROM programming.

Write protection is controlled solely by the WP pin state (VSS = enabled, VCC = inhibited), sampled at the Stop bit of each write command. Acknowledge polling is supported to detect end-of-write-cycle completion without fixed delay timing.

Key Specifications

Pinout & Package

24AA32AT-I/SN is supplied in an 8-lead SOIC (SN) package measuring 3.90 mm × 4.90 mm × 1.75 mm, with gull-wing leads, RoHS-compliant matte tin finish, and JEDEC MS-012AC outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC32AT-I/SN, the 24AA32AT-I/SN enables lower-voltage operation and shares identical packaging and timing - whereas AT24C32D-SSHM-T omits hardware write protection and requires address conflict management in multi-device systems.

Availability

24AA32AT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration retention, and automotive body control module applications requiring stable component supply across extended product lifecycles.

Supply support for 24AA32AT-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 24AA32A family delivers low-power, I²C-compatible EEPROMs optimized for industrial, automotive, and consumer applications demanding high endurance, long data retention, and robust noise immunity.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA32AT-I/SN?

The 24AA32AT-I/SN operates reliably down to 1.7V across its full industrial temperature range (-40°C to +85°C). Below 2.5V, maximum I²C clock frequency is limited to 100 kHz to maintain timing margins. This makes the 24AA32AT-I/SN suitable for direct integration into 1.8V systems without level-shifting circuitry.

Does the 24AA32AT-I/SN support page write operations, and what is the maximum page size?

Yes, the 24AA32AT-I/SN supports page write operations with a 32-byte page buffer. Physical page boundaries align to 32-byte offsets (e.g., 0x000–0x01F, 0x020–0x03F). Writing across a boundary causes wraparound within the current page - software must enforce alignment to avoid unintended overwrites. Each page write completes in ≤5 ms.

How does the Write-Protect (WP) pin function on the 24AA32AT-I/SN?

The WP pin on the 24AA32AT-I/SN is sampled at the Stop bit of every write command. When tied to VCC, all write operations (byte and page) are inhibited while read access remains fully functional. Toggling WP during an active write cycle has no effect - protection state is latched only at Stop detection. This provides deterministic, hardware-enforced data integrity.

Can multiple 24AA32AT-I/SN devices share the same I²C bus, and how is addressing managed?

Yes, up to eight 24AA32AT-I/SN devices can share one I²C bus using the A0, A1, and A2 address pins. These three inputs form the LSBs of the 7-bit client address (1010xxx), allowing unique addressing without external logic. The 24AA32AT-I/SN ignores commands unless the transmitted address matches its hardwired A0–A2 state.

What is the endurance rating and data retention specification for the 24AA32AT-I/SN?

The 24AA32AT-I/SN is rated for more than 1,000,000 erase/write cycles per page and guarantees data retention exceeding 200 years at +25°C. Endurance is characterized at 5.5V and +25°C; retention is extrapolated per JEDEC JESD22-A117. Both specifications apply to the full industrial temperature range.