Microchip Technology 24AA32AT-I/MNY

Overview

24AA32AT-I/MNY from Microchip Technology is a 32-Kbit I²C serial EEPROM organized as 4K × 8-bit memory, operating from 1.7V to 5.5V with 400 kHz max clock frequency (100 kHz below 2.5V), 1 µA standby current, and hardware write-protect via WP pin. It supports page writes up to 32 bytes and delivers >1 million erase/write cycles with >200 years data retention for nonvolatile configuration storage in embedded control systems.

For engineers reviewing the 24AA32AT-I/MNY datasheet, 24AA32AT-I/MNY pinout, 24AA32AT-I/MNY application, or 24AA32AT-I/MNY equivalent, key selection considerations include low-voltage operation down to 1.7V, industrial temperature range (–40°C to +85°C), MSOP-8 package compatibility, and I²C bus timing compliance at both 100 kHz and 400 kHz.

Technical Context

The 24AA32AT-I/MNY implements a two-wire I²C interface with Schmitt-trigger inputs on SDA/SCL for noise immunity and slope-controlled outputs to suppress ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while the 32-byte page buffer supports efficient burst writes without host-side buffering.

Write protection is enforced by sampling the WP pin at the Stop bit of each write command; tying WP to VCC disables all writes while preserving read access. Device addressing uses a fixed 4-bit control code (1010b) plus three chip-select bits (A0–A2), allowing up to eight devices on one bus - though the MNY (MSOP-8) package fully supports all three address pins.

Key Specifications

Pinout & Package

24AA32AT-I/MNY 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 per datasheet). The package is RoHS-compliant and qualified for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC32AT-I/MNY, the 24AA32AT-I/MNY enables 1.7V operation critical for low-power IoT nodes, while AT24C32D-MAHM-T extends thermal range for harsh environments - neither is pin-compatible with alternate packages, but all share identical I²C protocol and memory map.

Availability

24AA32AT-I/MNY is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic devices, smart energy meters, and automotive body control modules requiring stable component supply, long-term data retention, and low-voltage I²C interfacing.

Supply support for 24AA32AT-I/MNY 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 microcontroller, analog, FPGA, and memory solutions, serving industrial, automotive, and consumer markets with vertically integrated silicon and software.

The 24AA32A family is designed for reliable, low-power nonvolatile storage in resource-constrained embedded systems - emphasizing voltage flexibility, I²C robustness, and long-term data integrity over high-speed throughput.

FAQ

What is the maximum I²C clock frequency supported by the 24AA32AT-I/MNY?

The 24AA32AT-I/MNY supports up to 400 kHz I²C clock frequency when V_CC is ≥2.5V. At V_CC between 1.7V and 2.5V, the maximum clock frequency is reduced to 100 kHz to ensure timing margin and signal integrity. This dual-speed capability allows seamless integration across 1.8V, 3.3V, and 5V systems without redesign.

How does the WP pin function on the 24AA32AT-I/MNY?

The WP (Write-Protect) pin on the 24AA32AT-I/MNY is sampled at the Stop bit of each write command. When tied to VCC, it disables all write operations (byte and page) while permitting unrestricted read access. When tied to VSS, writes are enabled. This hardware-level protection prevents accidental overwrites without firmware intervention - a critical feature for safety-critical or regulatory-compliant applications using the 24AA32AT-I/MNY.

Can multiple 24AA32AT-I/MNY devices share the same I²C bus?

Yes, up to eight 24AA32AT-I/MNY devices can operate on the same I²C bus using unique addresses formed by combinations of A0, A1, and A2 pins. Each device's address is determined by its hardwired A0–A2 states, allowing a total addressable space of 256 Kbits. The 24AA32AT-I/MNY's MSOP-8 package fully exposes all three address pins, enabling full multi-device configuration.

What is the page write capability of the 24AA32AT-I/MNY?

The 24AA32AT-I/MNY features a 32-byte page write buffer, allowing the host to transmit up to 32 bytes of data in a single I²C transaction before issuing the Stop condition that triggers the internal self-timed write cycle. This reduces bus arbitration overhead and improves effective write throughput compared to byte-write-only EEPROMs - a key efficiency advantage in the 24AA32AT-I/MNY's architecture.

Is the 24AA32AT-I/MNY qualified for automotive applications?

The 24AA32AT-I/MNY itself is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. However, the broader 24XX32A family includes AEC-Q100-qualified variants (e.g., 24AA32AT-E/MNY for extended temp). For automotive body control modules requiring qualification, engineers should verify the specific suffix and consult Microchip's automotive-grade documentation before selecting the 24AA32AT-I/MNY.