Microchip Technology 24AA32AFT-I/MS

Overview

24AA32AFT-I/MS from Microchip Technology Inc. is a 32 Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 400 μA max read current, and hardware write-protect for upper 1/4 array (C00h–FFFh). It serves in low-power embedded systems requiring nonvolatile parameter storage.

For engineers reviewing the 24AA32AFT-I/MS datasheet, 24AA32AFT-I/MS pinout, 24AA32AFT-I/MS application, or 24AA32AFT-I/MS equivalent, key selection factors include V_CC min (1.7V), page write buffer size (32 bytes), WP-enabled quarter-array protection, I²C clock compatibility (100/400 kHz), and MSOP-8 package footprint constraints.

Technical Context

The 24AA32AFT-I/MS implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and ground bounce. Its internal address counter supports current-address, random, and sequential reads, while the 32-byte page write buffer enables efficient bulk writes within physical page boundaries (0–31, 32–63, etc.).

Write protection is enforced via the WP pin: tied to V_CC, it disables writes to addresses C00h–FFFh; tied to V_SS, full array access is enabled. Acknowledge polling allows bus-efficient detection of write cycle completion without fixed delays.

Key Specifications

Pinout & Package

24AA32AFT-I/MS is housed in an 8-pin MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch) with exposed pad option per Microchip's standard MSOP-8 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC32AFT-I/MS, the 24AA32AFT-I/MS enables true 1.7V operation and shares identical packaging and pinout, while the AT24C32D-MAHM-T offers voltage compatibility but removes hardware-level write protection - making 24AA32AFT-I/MS optimal for safety-critical or ultra-low-voltage designs requiring guaranteed quarter-array lock.

Availability

24AA32AFT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24AA32AFT-I/MS 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 24AA32AF family was designed specifically for low-power, I²C-based nonvolatile storage in space- and energy-constrained embedded systems, emphasizing voltage flexibility, data integrity, and industrial-grade reliability.

FAQ

What is the minimum operating voltage for the 24AA32AFT-I/MS?

The 24AA32AFT-I/MS supports operation down to 1.7V, enabling direct use with 1.8V logic families and battery-powered systems where supply voltage may sag. This is a key differentiator from the 24LC32A variant, which requires a minimum of 2.5V. The 24AA32AFT-I/MS maintains full I²C functionality-including 400 kHz clock support-at 1.7V, provided V_CC remains within specification.

Does the 24AA32AFT-I/MS support page write operations, and what is the buffer size?

Yes, the 24AA32AFT-I/MS supports page write operations with a 32-byte buffer. This allows up to 32 bytes of contiguous data to be loaded into the internal latch and written to memory in a single self-timed cycle (≤5 ms). Page writes must remain within physical page boundaries (e.g., addresses 0x000–0x01F), as crossing boundaries causes wraparound instead of sequential advancement.

How does the Write-Protect (WP) pin function on the 24AA32AFT-I/MS?

When the WP pin of the 24AA32AFT-I/MS is tied to V_CC, write operations to memory addresses C00h–FFFh (upper 1/4 array) are disabled; reads remain fully functional. When WP is tied to V_SS, full array write access is enabled. The WP state is sampled at the Stop bit of each write command, so dynamic toggling during active communication has no effect on ongoing cycles.

What package type is used for the 24AA32AFT-I/MS, and what are its key dimensions?

The 24AA32AFT-I/MS uses an 8-pin MSOP package (Micro Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body size, and nominal thickness of 1.1 mm. It conforms to JEDEC MO-187AC and includes an exposed thermal pad option. This compact footprint supports high-density PCB layouts while maintaining hand-solderability and automated assembly compatibility.

Can multiple 24AA32AFT-I/MS devices share the same I²C bus, and how is addressing managed?

Yes, up to eight 24AA32AFT-I/MS devices can share one I²C bus using hardwired A0, A1, and A2 pins to set unique 3-bit chip addresses. Each device responds only to its assigned address (1010xx0 binary), allowing combined capacity up to 256 Kbit. Address pins are not present in SOT-23 variants but are fully implemented in the MSOP-8 package of the 24AA32AFT-I/MS.