ST24LC21M6TR

Updated: 2026-09-12

Overview

The ST24LC21M6TR is a serial EEPROM memory component manufactured by STMicroelectronics, designed for low-power embedded systems. With 2Kbit (256x8) capacity, it serves as reliable non-volatile memory for configuration data and parameter storage in various electronic devices. This IC operates across a wide voltage range (1.7V to 5.5V), making it versatile for battery-powered applications. The SOIC-8 package offers compact footprint while maintaining good thermal characteristics, suitable for space-constrained designs.

Structure and Working Principle

The device consists of a memory array with I2C interface circuitry, address counter, and control logic. Data is stored in a floating gate transistor structure that retains information when power is removed. Communication occurs through the two-wire I2C bus (SCL and SDA pins), supporting clock frequencies up to 400kHz. The chip implements standard I2C protocol with device addressing, allowing multiple memory devices to share the same bus when properly configured.

Key Features

Low power consumption (1μA standby current) makes this EEPROM ideal for battery-operated devices. The component offers 1,000,000 write cycles endurance and 40-year data retention, ensuring long-term reliability. Additional features include built-in write protection (via WP pin), sequential read operation for faster data access, and industrial temperature range operation (-40°C to +85°C). The Schmitt trigger inputs provide noise immunity in electrically noisy environments.

Application Areas

Common applications include smart meters, industrial control systems, and consumer electronics where small amounts of non-volatile storage are needed. Automotive uses include ECU parameter storage and infotainment system configuration. The memory is also widely used in IoT devices for storing network credentials, calibration data, and usage statistics. Medical devices utilize it for equipment configuration and usage history logging due to its reliability.

Maintenance and Precautions

Proper ESD handling procedures should be followed during installation and maintenance. The device should be stored in moisture-sensitive packaging until use, with recommended soldering profiles followed during PCB assembly. Circuit design should include appropriate pull-up resistors for the I2C bus lines. Designers should implement write-cycle management in firmware to distribute writes across memory locations and maximize device lifetime.

B2B Procurement Guide

Industrial buyers should verify manufacturer part number authenticity due to common counterfeiting in memory components. Minimum order quantities typically apply, with price breaks at 1k, 10k, and 100k unit quantities. Lead times vary by market conditions but commonly range from 8-12 weeks for standard orders. Evaluation boards (STEVAL-xxx) are available for engineering teams to test compatibility before full production orders.