24CS256T-E/SN66KVAO

Memory IC Overview

The Microchip Technology 24CS256T-E/SN66KVAO is a 256-Kbit (32,768 x 8-bit) 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 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

• High-speed I²C communication supporting standard modes and 3.4 MHz High-Speed operation
• Integrated 128-bit factory-programmed serial number for unique device identification
• Built-in Error Correction Code (ECC) logic to correct single-bit read errors
• Configurable write protection allowing full array or individual zone locking via software

Memory IC Applications

• Automotive systems requiring AEC-Q100 qualified nonvolatile memory
• Industrial applications needing reliable data storage across extended temperatures
• Consumer electronics requiring unique product serialization
• Data acquisition systems utilizing secure configuration storage

Memory IC Procurement Notes

Verify the specific suffix 'SN66KVAO' against official Microchip documentation to confirm package type, tape-and-reel quantity, and automotive qualification status. Ensure the ordering code matches the required 8-lead SOIC package and temperature grade. Cross-reference the manufacturer part number with authorized distributors to confirm current availability and compliance with RoHS standards before finalizing procurement.

Memory IC Selection Notes

Select this component when high-speed I²C data transfer rates are required alongside robust data integrity features. The built-in ECC and extensive write protection schemes make it suitable for safety-critical or high-reliability environments. Consider the 8-lead SOIC package constraints and ensure the system voltage supports the 1.7V to 5.5V operating range. Verify that the application benefits from the pre-programmed serial number functionality for manufacturing efficiency.

Memory IC Part Context

This device belongs to the 24CS series of serial EEPROMs designed by Microchip Technology. It is backward compatible with legacy devices such as the 24AA256, 24LC256, and AT24C256C. The 24CS series distinguishes itself through enhanced security features, including unique serial numbers and advanced software-based write protection, catering to modern embedded systems requiring higher levels of data security and identification capabilities.

Memory IC Replacement Considerations

The datasheet confirms backward compatibility with the 24AA256, 24LC256, and 24FC256. Substitution with these parts may require disabling High-Speed mode and verifying that the legacy devices meet the extended temperature and voltage requirements. Ensure that the replacement part supports the necessary I²C addressing and pinout configurations.