EEPROM, 32KX8, Serial, CMOS, PDSO8

CAT24C256WI-GT3 – 256Kbit I2C EEPROM – onsemi

This high-performance EEPROM from onsemi delivers reliable non-volatile memory storage for data-critical applications. Featuring a wide voltage range and industrial temperature tolerance, it ensures robust operation in diverse electronic systems while simplifying design with its I2C interface.

Key Features

• Memory Size: 256Kbit (32K x 8 organization)
• Interface: I2C with 1 MHz clock frequency
• Voltage Range: 1.8V to 5.5V – compatible with 3.3V and 5V systems
• Write Speed: 5ms page/write cycle time
• Temperature Range: -40°C to 85°C (industrial grade)
• Package: 8-SOIC surface-mount (3.90mm width)

Technical Details

Organized as 32K x 8 bits, this EEPROM provides byte and page-write capability with a fast 500ns access time. The I2C serial interface supports standard (100kHz) and fast (400kHz) modes in addition to its 1 MHz high-speed operation. Built using proven EEPROM technology, it maintains data integrity for over 100 years and supports 1 million write cycles. The device includes hardware write protection and sequential read functionality for efficient data handling.

Common Applications

• Smart meter and energy management systems
• Industrial automation controllers
• Automotive sensor calibration storage
• Medical device parameter retention
• IoT device configuration memory

About onsemi

onsemi (ON Semiconductor) is a global leader in power management and sensing technologies, renowned for innovative semiconductor solutions. With over 25 years of memory IC expertise, they drive advancements in energy efficiency and system reliability across automotive, industrial, and communications markets.

The company maintains rigorous quality certifications including IATF 16949 for automotive applications, ensuring components meet stringent performance and longevity requirements. Their vertically integrated manufacturing provides full supply chain control, guaranteeing consistent product availability and traceability.

About EEPROM Memory ICs

EEPROM (Electrically Erasable Programmable Read-Only Memory) provides critical non-volatile storage that retains data without power. Unlike volatile memory, EEPROMs preserve configuration settings, calibration data, and user preferences through power cycles and system reboots, making them indispensable for embedded systems.

Modern EEPROMs like this I2C-compatible device offer significant advantages over legacy parallel interfaces: reduced pin count (only 2 wires for communication), simpler PCB routing, and lower power consumption. These characteristics enable compact designs in space-constrained applications while providing reliable long-term data retention.

Packaging Options

Available in industry-standard formats for automated assembly: Tape & Reel (TR), Cut Tape (CT), and Digi-Reel® packaging. Specify your preferred option during checkout.

FAQs

Q: What is the endurance rating for this EEPROM?
A: The CAT24C256WI-GT3 supports a minimum of 1,000,000 write cycles per byte, ensuring long-term reliability in frequently updated applications.

Q: Does it support partial page writes?
A: Yes, it features 64-byte page write buffer capability, allowing efficient multi-byte updates.

Q: Is this EEPROM compatible with 3.3V microcontrollers?
A: Absolutely. Its wide 1.8V–5.5V operating range ensures seamless integration with both 3.3V and 5V systems.

Q: How does the I2C address configuration work?
A: Three address pins (A0-A2) allow up to eight devices on the same bus (0x50–0x57 hex addresses), enabling scalable memory expansion.

Q: What protection features are included?
A: Built-in hardware write protection prevents accidental data corruption, while internal error correction enhances data integrity.

Q: Is RoHS compliance guaranteed?
A: Yes, all onsemi components supplied by PCX meet current RoHS 3 standards for environmental safety.

Note: Product images are representational. Refer to datasheet for exact dimensions and pinouts. Download full datasheet

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