24CS256T-E/OT66KVAO

Memory IC Overview

The Microchip Technology 24CS256T-E/OT66KVAO 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 1.7 V to 5.5 V and supports extended industrial temperatures from -40°C to +125°C. The device includes built-in Error Correction Code (ECC) logic, a 128-bit factory-programmed serial number, and enhanced software write protection. Packaged in a 5-lead SOT-23 format, it offers high reliability with over one million erase/write cycles and data retention exceeding 200 years.

Memory IC Feature Summary

• Built-in Error Correction Code (ECC) logic for increased data reliability
• Preprogrammed 128-bit globally unique serial number
• Enhanced software write protection allowing independent zone locking
• High-Speed I2C interface supporting 3.4 MHz operation

Memory IC Applications

• Automotive systems requiring AEC-Q100 qualified memory
• Industrial applications needing reliable nonvolatile storage at high temperatures
• Consumer electronics requiring compact surface-mount packaging

Memory IC Procurement Notes

Verify the specific suffix '66KVAO' against official Microchip documentation to confirm exact manufacturing lot codes or regional compliance markings. Ensure the ordering part number matches the required temperature grade (Extended) and package type (SOT-23). Cross-reference datasheet DS20005998 for pinout compatibility with existing designs.

Memory IC Selection Notes

Select this component when high-speed I2C communication up to 3.4 MHz is required alongside robust data integrity features. The integrated ECC and serial number eliminate external components for security and error handling. Choose the Extended temperature variant for environments exceeding standard industrial limits.

Memory IC Part Context

This part belongs to the 24CS256 family of 256-Kbit Serial EEPROMs. It is backward compatible with legacy devices like the 24AA256 and 24LC256. The 'E' designation indicates Extended temperature capability (-40°C to +125°C), while 'T' denotes tape-and-reel packaging. The 'OT' specifies the SOT-23-5 package.

Memory IC Replacement Considerations

Direct substitutes include 24CS256T-E/OT and 24CS256-E/SN. Verify that replacement parts match the specific suffix requirements for automotive qualification and package dimensions.