24AA256UIDT-I/ST

Memory IC Overview

The Microchip Technology 24AA256UIDT-I/ST is a 256 Kbit (32K x 8) serial EEPROM featuring preprogrammed globally unique identifiers. It operates on a single supply voltage ranging from 1.7V to 5.5V and supports I²C communication with clock frequencies up to 400 kHz. The device includes a 64-byte page write buffer and provides EUI-48 and EUI-64 node addresses alongside a 32-bit serial number stored in the permanently write-protected upper 1/8th of the array. It is housed in an 8-lead TSSOP package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Preprogrammed globally unique EUI-48 and EUI-64 node addresses along with a 32-bit serial number stored in the permanently write-protected upper portion of the memory array.
• Supports bidirectional two-wire serial interface compatible with standard I²C protocols, allowing for cascading up to eight devices on the same bus.
• Features Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce during operation.

Memory IC Applications

• Device identification and authentication in embedded systems requiring unique hardware fingerprints.
• Network node addressing for IoT devices utilizing IEEE standards for global uniqueness.
• Secure storage of configuration data or calibration parameters where write protection is required.

Memory IC Procurement Notes

Verify that the ordering suffix 'T' corresponds to the tape and reel packaging format rather than tube packaging. Confirm the 'I' suffix indicates the industrial temperature grade (-40°C to +85°C). Ensure the 'ST' suffix matches the 8-lead TSSOP physical package dimensions required by your PCB layout. Cross-reference the specific revision level if strict manufacturing consistency is needed.

Memory IC Selection Notes

Select this component when application requirements demand factory-programmed unique identifiers compliant with IEEE EUI standards. It is suitable for designs needing low standby current and broad voltage compatibility down to 1.7V. Consider the 64-byte page write capability for efficient data throughput. Verify that the TSSOP package fits the available board space and assembly capabilities.

Memory IC Part Context

This part belongs to the 24AA256UID family of serial EEPROMs manufactured by Microchip Technology. It shares core electrical specifications with other variants in the series but is distinguished by its integrated unique ID features and specific surface-mount TSSOP packaging. It serves as a non-volatile memory solution for applications requiring both data storage and hardware identity verification.

Memory IC Replacement Considerations

Direct pin-to-pin replacements must be sourced from the same manufacturer's UID-family lineup to ensure identical preprogrammed address structures. Verify that any substitute maintains the same I²C timing characteristics and voltage operating ranges.

Memory IC FAQ

Is the preprogrammed EUI-48/EUI-64 address writable?

No, the EUI-48 and EUI-64 addresses are stored in the upper 1/8th of the EEPROM array, which is permanently write-protected at the factory.

What is the maximum clock frequency for this device?

The device supports a maximum clock frequency of 400 kHz when VCC is between 2.5V and 5.5V. At voltages below 2.5V, the maximum frequency is limited to 100 kHz.