24LC32A-I/ST

Updated: 2026-09-15

Overview

The 24LC32A-I/ST is a 32Kbit (4K x 8) serial electrically erasable programmable read-only memory (EEPROM) from Microchip Technology. It is designed for low-power, high-reliability applications and operates over a wide voltage range (1.7V to 5.5V), making it versatile for various embedded systems. This EEPROM communicates via the I2C protocol, supporting standard (100 kHz) and fast (400 kHz) modes. It is housed in an 8-lead TSSOP package, which is compact and suitable for space-constrained designs. The device is ideal for storing configuration data, calibration settings, or other small datasets in industrial, automotive, and consumer electronics.

Structure and Working Principle

The 24LC32A-I/ST consists of a memory array organized as 4,096 bytes of 8 bits each. It uses a two-wire I2C interface (SCL for clock and SDA for data) for communication with microcontrollers or other host devices. The internal circuitry includes address decoders, control logic, and a charge pump for generating programming voltages. Data is written or read by sending a start condition, device address, memory address, and data bytes over the I2C bus. The EEPROM supports sequential reads for efficient data retrieval. Write operations are self-timed, and the device includes write protection features to prevent accidental data corruption.

Key Features

The 24LC32A-I/ST offers several advantages, including low power consumption (standby current typically 1 µA) and a wide operating voltage range, which makes it suitable for battery-powered applications. It also provides high endurance (1,000,000 erase/write cycles) and data retention of up to 200 years. Other notable features include built-in noise suppression for reliable operation in electrically noisy environments and a write-protect pin (WP) to prevent unintended writes. The device is RoHS compliant and operates over an industrial temperature range (-40°C to +85°C), ensuring robustness in harsh conditions.

Application Areas

This EEPROM is widely used in embedded systems where non-volatile storage is required. Common applications include storing device configuration parameters, calibration data, or user settings in industrial control systems, medical devices, and automotive electronics. Consumer electronics such as smart home devices, wearables, and IoT products also benefit from its small footprint and low power consumption. Additionally, the 24LC32A-I/ST is used in prototyping and development boards to provide flexible storage solutions for engineers and hobbyists.

Maintenance and Precautions

To ensure longevity and reliability, avoid exposing the 24LC32A-I/ST to excessive electrostatic discharge (ESD). Proper handling techniques, such as using grounded wrist straps and anti-static mats, are recommended during installation. When soldering, adhere to the manufacturer's guidelines for temperature profiles to prevent thermal damage. The device's write-protect pin (WP) should be utilized to safeguard critical data during firmware updates or system resets. Regularly verify data integrity in mission-critical applications to detect potential memory degradation over time.

B2B Procurement Guide

When procuring the 24LC32A-I/ST in bulk, verify the supplier's authenticity to avoid counterfeit components. Microchip Technology or authorized distributors like Digi-Key, Mouser, and Arrow Electronics are reliable sources. Consider lead times and minimum order quantities (MOQs) for project planning. Pricing varies based on volume, with discounts available for large orders. For custom requirements, such as specific reel sizes or tape-and-reel packaging, confirm availability with the supplier. Always check for compliance with environmental regulations (e.g., RoHS, REACH) if applicable to your industry.