AT24C256N 256Kbit I²C Serial EEPROM IC SOP-8 – Pack of 5 (24C256)

AT24C256N 256Kbit I²C Serial EEPROM IC — SOP-8, 32KB, 400kHz, 5-Pack

The AT24C256N (24C256) is a 256Kbit (32KB) I²C serial EEPROM from Microchip (formerly Atmel), widely used for non-volatile data storage in Arduino data loggers, embedded system configuration, calibration data, and industrial equipment. With 400kHz I²C speed, 1 million write endurance, and 100-year data retention, it is the industry-standard choice for reliable embedded storage in SOP-8 SMD package.

Key Specifications

Parameter	Value
Part Number	AT24C256N (24C256)
Capacity	256Kbit = 32KB
Interface	I²C (2-wire: SDA + SCL)
Max I²C Speed	400kHz (Fast Mode)
Supply Voltage	2.7V – 5.5V
I²C Address Range	0x50 – 0x57 (A0–A2 configurable)
Page Write Size	64 bytes
Write Cycle Time	5ms (max)
Write Endurance	1,000,000 cycles
Data Retention	100 years
Write Protect Pin	Yes (WP pin)
Package	SOP-8 (SOIC-8)
Operating Temperature	-40°C to +85°C
Pack Quantity	5 pieces

SOP-8 Pin Configuration

Pin	Name	Function
1–3	A0–A2	I²C address selection (0x50–0x57)
4	VSS	Ground
5	SDA	I²C data
6	SCL	I²C clock
7	WP	Write protect (HIGH = protected)
8	VCC	Supply voltage

Why Choose AT24C256N?

• ✅ 32KB capacity — stores thousands of sensor readings or configuration parameters
• ✅ Up to 8 ICs on one I²C bus — expandable to 256KB total storage
• ✅ 1 million write cycles — long service life for data logging applications
• ✅ 100-year data retention — reliable non-volatile storage
• ✅ Write protect pin — hardware protection against accidental writes
• ✅ 5-pack value — spares for prototyping and production

Typical Applications

• Arduino data logger non-volatile storage
• Embedded system configuration and calibration data
• User preferences and settings storage
• Industrial equipment parameter storage
• Cascaded I²C EEPROM for up to 256KB total storage

Package Contents

• 5 × AT24C256N (24C256) 256Kbit I²C EEPROM IC (SOP-8)

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