24CS256T-E/Q4B

Memory IC Overview

The Microchip Technology 24CS256T-E/Q4B 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 industrial (-40°C to +85°C) and extended (-40°C to +125°C) temperature ranges. The device includes a 1-Kbit Security Register containing a factory-programmed 128-bit serial number and user-programmable lockable ID pages. Built-in ECC logic enhances reliability by correcting single-bit read errors.

Memory IC Feature Summary

• Integrated 128-bit globally unique serial number for manufacturing serialization
• Built-in Error Correction Code (ECC) logic for data integrity
• Enhanced software write protection allowing independent zone locking
• AEC-Q100 automotive qualification for high-reliability applications

Memory IC Applications

• Automotive electronic control units requiring AEC-Q100 compliance
• Industrial systems needing reliable nonvolatile memory storage
• Consumer electronics requiring hardware-level product identification
• IoT devices utilizing embedded security registers for authentication

Memory IC Procurement Notes

Verify the specific 'E' suffix indicates Extended Temperature Range (-40°C to +125°C) rather than Industrial grade. Confirm the 'Q4B' suffix corresponds to the 8-Lead UDFN package type. Ensure compatibility with system voltage levels between 1.7V and 5.5V. Check for RoHS compliance status in current distributor listings.

Memory IC Selection Notes

Select this component when application requirements demand automotive-grade reliability alongside high-speed I²C communication. The extended temperature range makes it suitable for harsh environments where standard industrial parts may fail. The integrated security features reduce external component count for authentication tasks.

Memory IC Part Context

This part belongs to the 24CS256 family of serial EEPROMs designed for backward compatibility with legacy 24AA/24LC/24FC series devices. It shares the same pinout and basic command set while adding advanced security and error correction capabilities not found in older generations.

Memory IC Replacement Considerations

Direct substitutes include 24CS256-I/Q4B for industrial temperature range or 24CS256T-E/SN for SOIC packaging. Verify that any replacement maintains the required 3.4 MHz High-Speed mode capability and AEC-Q100 qualification if automotive use is intended.