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KS24C04

4Kbit I2C EEPROM, 512x8, 400kHz, 1M cycles, SOIC-8, write protect, non-volatile

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Manufacturer Part：

KS24C04

Package：

SOIC-8 (4.90 x 3.90 x 1.37 mm)

Description

Product Overview

The KS24C04 from Samsung is a 4Kbit (512×8) I2C serial EEPROM in a SOIC-8 package. With 1 million erase/write cycles and 100-year data retention, it provides reliable non-volatile storage for configuration data, calibration, and user settings.

Key Specifications

Memory Size	4 Kbit (512 x 8 bit)
Interface	I2C (2-wire serial)
Clock Frequency	400 kHz (max)
Write Cycle Time	5 ms (max, byte/page)
Endurance	1,000,000 cycles
Data Retention	100 years
Operating Temperature	-40C to +85C

Features

4Kbit (512 bytes) non-volatile EEPROM storage
I2C bus interface at up to 400kHz (fast mode)
16-byte page write mode for efficient data storage
1 million erase/write cycle endurance
100-year data retention for long-term reliability
Hardware write protect pin for accidental write prevention

Applications

Device configuration and calibration storage
User preference and setting retention in consumer electronics
Industrial parameter storage in control systems
Asset tracking and identification data storage

Product Introduction:KS24C04 Product Introduction

The KS24C04 from Samsung is a 4Kbit (512 x 8 bit) electrically erasable programmable read-only memory (EEPROM) with I2C serial interface in a SOIC-8 package. The device uses a standard 2-wire I2C bus for communication, supporting clock frequencies up to 400kHz (fast mode). The memory is organized as 512 bytes of 8 bits each, with a 16-byte page write capability that allows up to 16 bytes to be written in a single write cycle. The write cycle time is 5ms maximum for both byte and page writes. The device supports 1 million erase/write cycles with 100-year data retention, providing long-term reliability for configuration and calibration data. A hardware write protect (WP) pin prevents accidental write operations when tied to VCC. The I2C device address is partially configurable through the A0-A2 address pins, allowing up to 8 devices on the same I2C bus. The device operates from 1.8V to 5.5V supply and is rated for -40C to +85C.

Working Principle:KS24C04 Working Principle

The KS24C04 uses floating-gate NMOS memory cells for non-volatile storage. (1) Memory Cell: Each bit is stored as charge on a floating gate electrode isolated by oxide layers. A charged floating gate shifts the transistor threshold voltage high (logic 0), while an uncharged gate leaves the transistor in the low-threshold state (logic 1). (2) Read: During a read operation, the memory cell transistor is biased at a voltage between the two threshold levels. If the cell is programmed (charged gate), the transistor does not conduct. If the cell is erased (uncharged gate), the transistor conducts. A sense amplifier detects the current difference and outputs the corresponding logic level. (3) Write: Programming uses Fowler-Nordheim tunneling – a high voltage (approximately 15V) applied across the thin oxide causes electrons to tunnel onto the floating gate. Erasing reverses the voltage to remove electrons. (4) I2C Protocol: The host initiates communication with a start condition, followed by the 7-bit device address and R/W bit. The addressed KS24C04 acknowledges and then receives or transmits data according to the R/W bit. (5) Page Write: Up to 16 bytes can be written sequentially. The lower 4 address bits auto-increment, while the upper bits remain constant. The write operation begins after the stop condition.

Pin Description:KS24C04 Pin Definition and Functions

Pin	Name	Type	Function
1	A0	Input	Address input 0
2	A1	Input	Address input 1
3	A2	Input	Address input 2
4	VSS	Ground	Ground
5	SDA	I/O	Serial data (open-drain, bidirectional)
6	SCL	Input	Serial clock
7	WP	Input	Write protect (HIGH = protect upper quadrant)
8	VCC	Power	Supply (1.8V to 5.5V)

Application Scenarios:In which products and applications isKS24C04 used

Device configuration and calibration storage with 100-year retention
User preference and setting retention in consumer electronics
Industrial parameter storage in control systems with 1M write cycles
Asset tracking and identification data storage with I2C interface

Alternative Models:What chips are recommended as replacements for KS24C04

Manufacturer	Part Number	Package	Notes
Microchip	AT24C04C-SSHL-T	SOIC-8	Direct equivalent, popular
ST	M24C04-WMN6TP	SOIC-8	Direct equivalent
onsemi	CAT24C04WI-GT3	SOIC-8	Direct equivalent
Microchip	AT24C08B-SSHL-T	SOIC-8	8Kbit version, same family