Microchip Technology 24LC32AT-I/MNY

Overview

24LC32AT-I/MNY from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory with hardware write-protection, 32-byte page buffer, and operation from 2.5V to 5.5V. It supports 400 kHz clock frequency at V_CC ≥ 2.5V, delivers ≤1 µA standby current, and guarantees >1 million erase/write cycles with >200 years data retention. It is used for nonvolatile parameter storage in industrial sensor nodes and embedded control modules.

For engineers reviewing the 24LC32AT-I/MNY datasheet, 24LC32AT-I/MNY pinout, 24LC32AT-I/MNY application, or 24LC32AT-I/MNY equivalent, key selection considerations include its I²C interface timing compliance (100/400 kHz), WP pin-based hardware write-protect, MSOP-8 package footprint, and -40°C to +85°C industrial temperature rating.

Technical Context

The 24LC32AT-I/MNY implements a two-wire I²C bus 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 allows efficient multi-byte writes within a single physical page boundary (0x000–0x01F, 0x020–0x03F, etc.).

Write protection is enforced via the WP pin sampled at the Stop bit of each write command; tying WP to V_CC inhibits all array writes while permitting reads. Acknowledge polling is supported to detect write-cycle completion without fixed delay timing.

Key Specifications

Pinout & Package

24LC32AT-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 (optional V_SS connection). The package is RoHS-compliant and qualified per AEC-Q100 for automotive-grade reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA32AT-I/MNY and AT24C32D-MAHM-T, the 24LC32AT-I/MNY provides guaranteed 2.5V operation and AEC-Q100 qualification - critical for automotive body electronics and industrial control where voltage stability and qualification traceability are mandatory.

Availability

24LC32AT-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for 24LC32AT-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 microcontrollers, analog components, and memory solutions, serving industrial, automotive, and consumer markets with vertically integrated design and manufacturing.

The 24LC32A family is designed for reliable, low-power nonvolatile data storage in space-constrained embedded systems requiring I²C interface simplicity and long-term data integrity.

FAQ

What is the maximum I²C clock frequency supported by the 24LC32AT-I/MNY?

The 24LC32AT-I/MNY supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher. At voltages below 2.5V, the maximum clock rate drops to 100 kHz. This dual-speed capability ensures compatibility with both legacy 100 kHz buses and modern high-speed I²C implementations. The 24LC32AT-I/MNY meets standard I²C timing specifications including THIGH, TLOW, and setup/hold times across its full operating range.

How does the hardware write-protect (WP) pin function on the 24LC32AT-I/MNY?

The WP pin on the 24LC32AT-I/MNY is sampled at the Stop bit of each write command. When tied to V_CC, it disables all write operations (byte and page) while allowing unrestricted reads. When tied to V_SS, writes are enabled. This feature prevents accidental overwrites of critical calibration data or configuration parameters. The 24LC32AT-I/MNY does not require firmware intervention to activate write protection - it is purely hardware-controlled and effective immediately upon power-up.

What package type is used for the 24LC32AT-I/MNY, and what are its key mechanical dimensions?

The 24LC32AT-I/MNY uses an 8-lead MSOP (Micro Small Outline Package) with 3×3 mm body size, 0.65 mm lead pitch, and nominal height of 0.85 mm. It features gull-wing leads and an optional exposed thermal pad. This compact footprint is ideal for space-constrained PCBs in industrial and automotive modules. The 24LC32AT-I/MNY's MSOP package is pin-compatible with other Microchip 24XX32A variants in the same package code.

Can multiple 24LC32AT-I/MNY devices share the same I²C bus, and how is addressing managed?

Yes, up to eight 24LC32AT-I/MNY devices can share one I²C bus using hardware address pins A0, A1, and A2. These pins set the three least-significant bits of the 7-bit I²C client address (base 1010xxx). Each device must have a unique combination of A0–A2 tied to V_SS or V_CC. The 24LC32AT-I/MNY responds only when its configured address matches the transmitted control byte, enabling scalable memory expansion up to 256 Kbits without additional address decoding logic.

What is the endurance and data retention specification for the 24LC32AT-I/MNY?

The 24LC32AT-I/MNY guarantees a minimum of 1,000,000 erase/write cycles and data retention exceeding 200 years at +25°C. These specifications are validated across the full industrial temperature range (-40°C to +85°C). Endurance is specified per page (32 bytes), meaning repeated writes to the same page consume one cycle. The 24LC32AT-I/MNY's robustness makes it suitable for applications requiring frequent parameter updates, such as energy meter tariff logging or sensor recalibration cycles.