Microchip Technology 24LC32A-I/MS

Overview

24LC32A-I/MS from Microchip Technology is a 32-Kbit I²C serial EEPROM organized as 4K × 8-bit, operating from 2.5V to 5.5V with industrial temperature range (–40°C to +85°C) and housed in an 8-lead MSOP package. It supports 400 kHz I²C clock, features hardware write-protection via WP pin, and delivers 1 µA standby current and >1 million erase/write cycles. It is used for nonvolatile parameter storage in embedded control modules requiring reliable, low-power data retention.

For engineers reviewing the 24LC32A-I/MS datasheet, 24LC32A-I/MS pinout, 24LC32A-I/MS application, or 24LC32A-I/MS equivalent, key selection considerations include VCC compatibility (2.5V min), I²C timing compliance at 400 kHz, page-write buffer size (32 bytes), WP pin behavior, and MSOP package footprint constraints.

Technical Context

The 24LC32A-I/MS implements a two-wire I²C interface with Schmitt-trigger inputs and slew-rate-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes a 32-byte page write buffer, address pointer auto-increment logic, and on-chip HV generator for EEPROM programming.

It uses a fixed 4-bit control code (1010b) followed by three chip-select bits (A2–A0) and R/W bit for device addressing-supporting up to eight devices on one bus. Write protection is controlled solely by the WP pin state at Stop condition sampling, with no effect from mid-cycle toggling.

Key Specifications

Pinout & Package

24LC32A-I/MS is supplied in an 8-lead MSOP (Micro Small Outline Package) with 3.0 mm × 3.0 mm body, 0.65 mm pitch, and exposed pad optional for thermal relief or grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the 24LC32A-I/MS provides optimal balance of AEC-Q100 qualification, industrial temperature rating, and proven MSOP footprint compatibility-making it preferred for automotive and ruggedized embedded designs where voltage stability and qualification supersede ultra-low-VCC or ECC needs.

Availability

24LC32A-I/MS is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, automotive body control modules, and smart energy metering requiring stable component supply across multi-year production cycles.

Supply support for 24LC32A-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 24LC32A belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power nonvolatile data storage in space-constrained, noise-prone embedded systems across automotive, industrial, and medical markets.

FAQ

What is the minimum VCC required for reliable operation of the 24LC32A-I/MS?

The 24LC32A-I/MS requires a minimum VCC of 2.5V for full specification compliance-including 400 kHz I²C operation and guaranteed timing margins. Operation below 2.5V is not supported per datasheet DS20001713P, unlike the 24AA32A variant which supports 1.7V. Using 24LC32A-I/MS at 2.4V may result in undefined behavior or write failures.

How does the WP pin function on the 24LC32A-I/MS during active communication?

The WP pin on the 24LC32A-I/MS is sampled only at the Stop condition of each write command-not continuously. When tied to VCC, it inhibits all write operations (byte/page) while allowing unrestricted reads; no ACK is generated for writes, but the device remains responsive to read commands. Toggling WP mid-transaction has no effect-the 24LC32A-I/MS relies solely on its state at Stop.

Can the 24LC32A-I/MS perform page writes across memory boundaries?

No. The 24LC32A-I/MS restricts page writes to a single 32-byte physical page (addresses aligned to 0x00, 0x20, 0x40, etc.). Attempting to write across a boundary causes automatic wraparound to the start of the same page, overwriting prior data. Application firmware must split multi-page writes explicitly-this behavior is inherent to the 24LC32A-I/MS architecture and cannot be overridden.

What is the maximum number of 24LC32A-I/MS devices that can share one I²C bus?

Up to eight 24LC32A-I/MS devices can coexist on a single I²C bus using unique combinations of A0, A1, and A2 pins (each tied to VSS or VCC). This yields 2³ = 8 distinct 7-bit client addresses (1010xxx). The SOT-23 variant excludes these pins, limiting it to a single device per bus-but the 24LC32A-I/MS in MSOP fully supports multi-drop configurations.

Is the 24LC32A-I/MS qualified for automotive applications?

Yes. The 24LC32A-I/MS carries AEC-Q100 qualification for Grade 3 (–40°C to +85°C), confirming reliability under automotive thermal, vibration, and ESD stress conditions. This certification applies specifically to the "I" temperature grade and MSOP package variant-ensuring suitability for body control, infotainment, and ADAS subsystems where certified components are mandated.