Microchip Technology 24AA32AT-I/MC

Overview

24AA32AT-I/MC from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit, operating from 1.7V to 5.5V with 400 kHz max clock frequency, 5 ms max page write time, and industrial temperature range (–40°C to +85°C). It delivers low-power operation (1 µA standby, 1 mA active), hardware write-protection via WP pin, and supports up to eight devices on one bus using A0–A2 address inputs.

For engineers reviewing the 24AA32AT-I/MC datasheet, 24AA32AT-I/MC pinout, 24AA32AT-I/MC application, or 24AA32AT-I/MC equivalent, this device serves as a drop-in replacement for legacy 24C32/24LC32A in embedded control, sensor calibration storage, and configuration memory where low-voltage operation, I²C compatibility, and high endurance (>1M cycles) are required.

Technical Context

The 24AA32AT-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 architecture includes a 32-byte page write buffer, self-timed erase/write cycle, and address pointer logic enabling current-address, random, and sequential read modes.

It uses CMOS EEPROM array technology with integrated high-voltage generator for programming. The device supports both byte and page write operations, with acknowledge polling for write-cycle completion detection, and hardware write-protection that disables writes when WP = VCC while permitting reads.

Key Specifications

Pinout & Package

24AA32AT-I/MC is packaged in an 8-lead MSOP (Micro Small Outline Package) with 3×3 mm body, 0.65 mm pitch, and exposed pad option (not connected by default). Pin 1 is marked with a dot or bevel; package meets JEDEC MO-187 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA32AT-I/MC, the 24LC32AT-I/MC excludes low-voltage operation below 2.5V but shares identical packaging and interface behavior, while the AT24C32D-SSHM-T trades AEC-Q100 compliance and endurance for lower unit cost in non-automotive applications.

Availability

24AA32AT-I/MC is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and embedded system configuration requiring stable component supply, long-term data retention, and automotive-grade reliability.

Supply support for 24AA32AT-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, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24AA32A family was designed for reliable, low-voltage nonvolatile storage in resource-constrained embedded systems-particularly targeting industrial automation, automotive subsystems, and IoT endpoints where power efficiency and data integrity are critical.

FAQ

What is the minimum operating voltage for the 24AA32AT-I/MC?

The 24AA32AT-I/MC operates down to 1.7V, making it compatible with 1.8V logic systems and enabling direct connection to low-voltage microcontrollers without level shifters. This specification is confirmed in the DC Characteristics table (Param. D10) of the official DS20001713P datasheet under Industrial temperature range.

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

Yes, the 24AA32AT-I/MC supports page write operations with a 32-byte buffer, allowing up to 32 bytes to be written in a single I²C transaction. This is documented in the Features section and verified in Section 6.2 (Page Write) of the DS20001713P datasheet, where it states "32-Byte Page Write Buffer" and confirms wraparound behavior beyond 32 bytes.

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

When the WP pin is tied to VCC, all write operations to the 24AA32AT-I/MC memory array are inhibited while read operations remain fully functional. When tied to VSS, full read/write access is enabled. This hardware-level protection is sampled at the Stop bit of each write command, as specified in Section 2.4 and Figure 6-1 of DS20001713P.

Is the 24AA32AT-I/MC AEC-Q100 qualified, and for which grade?

Yes, the 24AA32AT-I/MC is AEC-Q100 qualified for Grade 3 (–40°C to +85°C), matching its Industrial temperature rating. This qualification is explicitly stated in the Features section of DS20001713P and confirmed in the Device Selection Table, where "Automotive AEC-Q100 Qualified" is listed for the 24AA32A series.

What package type does the 24AA32AT-I/MC use, and what are its key mechanical dimensions?

The 24AA32AT-I/MC uses an 8-lead MSOP package (Micro Small Outline Package) with 3×3 mm body, 0.65 mm lead pitch, and 0.80–0.95 mm height. These dimensions are defined in Microchip Drawing C04-111-MS Rev F (DS20001713P, pages 18–19), and the "MC" suffix in the part number specifically denotes this MSOP variant.