24CS256T-E/Q4B66KVAO

Memory IC Overview

The Microchip Technology 24CS256T-E/Q4B66KVAO is a 256-Kbit (32 K x 8) serial EEPROM featuring an I²C interface with High-Speed mode support up to 3.4 MHz. It operates within a voltage range of 1.7V to 5.5V and supports extended temperature ranges from -40°C to +125°C. The device includes a 1-Kbit Security Register containing a factory-programmed 128-bit serial number and user-programmable lockable ID pages. Built-in Error Correction Code (ECC) logic enhances data reliability, while versatile write protection options include hardware WP pin control and enhanced software zone protection.

Memory IC Feature Summary

• Integrated 128-bit globally unique serial number for manufacturing serialization
• Built-in ECC logic capable of correcting single-bit read errors
• Enhanced software write protection allowing independent locking of eight memory zones
• Backward compatible with legacy I²C serial EEPROM architectures

Memory IC Applications

• Automotive systems requiring AEC-Q100 qualified nonvolatile storage
• Industrial equipment needing high-reliability data retention
• Consumer electronics utilizing secure device identification
• Embedded controllers requiring multi-device bus addressing

Memory IC Procurement Notes

Verify the specific suffix '66KVAO' against official Microchip documentation to confirm exact packaging, tape-and-reel specifications, and environmental compliance status. Ensure the Extended Temperature grade matches system requirements. Confirm availability through authorized distributors as supply levels may vary.

Memory IC Selection Notes

Select this component when application demands exceed standard 1 MHz I²C speeds by utilizing the 3.4 MHz High-Speed mode capability. Choose this part for designs requiring integrated hardware security features such as preprogrammed serial numbers and lockable configuration registers without external components.

Memory IC Part Context

This device belongs to the 24CS series of serial EEPROMs designed for robust data storage in demanding environments. It shares architectural similarities with other members like the 24CS128 and 24CS512 but offers specific capacity and feature sets tailored for automotive and industrial sectors requiring high endurance and data integrity.

Memory IC Replacement Considerations

The datasheet confirms backward compatibility with 24AA256, 24LC256, 24FC256, and AT24C256C devices. Verify pinout and voltage level compatibility before substitution.