24AA025UIDT-I/OT

Memory IC Overview

The Microchip Technology 24AA025UIDT-I/OT is a 2 Kbit (256 x 8) serial EEPROM featuring a preprogrammed, unique 32-bit serial number. It operates on a single supply voltage ranging from 1.7V to 5.5V and supports I²C™ compatible 2-wire serial interfaces with clock frequencies up to 400 kHz. The device includes a 16-byte page write buffer and offers data retention exceeding 200 years with over one million erase/write cycles. It is housed in a 6-lead SOT-23 package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Factory-programmed 32-bit unique serial number permanently stored in the upper half of the memory array
• Low-power CMOS technology enabling operation down to 1.7V with minimal standby current consumption
• Integrated Schmitt trigger inputs and output slope control for enhanced noise suppression and ground bounce elimination
• Self-timed erase/write cycle with automatic acknowledge polling capability to maximize bus throughput

Memory IC Applications

• Device identification and authentication systems requiring unique hardware identifiers
• Asset tracking and inventory management applications utilizing scalable serial numbers
• Secure access control systems leveraging factory-programmed manufacturer codes
• Embedded systems needing non-volatile storage for configuration data alongside unique IDs

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the UID family is available in multiple configurations including PDIP, SOIC, and various SOT-23 lead counts. Confirm the temperature grade corresponds to your operational environment requirements. Ensure the master controller supports the I²C protocol and can handle the specific chip select bit combinations if multiple devices are cascaded on the same bus.

Memory IC Selection Notes

Select this component when a unique hardware identifier is required alongside standard EEPROM functionality. The 24AA025UID variant provides a larger 16-byte page buffer compared to the 8-byte buffer in the 24AA02UID, allowing for more efficient bulk writes. Consider the 6-lead SOT-23 package for space-constrained designs where address pins A0 and A1 are utilized for device selection or contiguous addressing expansion.

Memory IC Part Context

This part belongs to the Microchip 24AA02XUID family of 2 Kbit serial EEPROMs. These devices are designed to provide both data storage and unique identification capabilities in a compact form factor. The family shares common electrical characteristics and interface protocols but differs in memory organization and package options to suit diverse application needs.

Memory IC Replacement Considerations

Direct replacements include other members of the 24AA02XUID family such as the 24AA02UIDT-I/OT, noting differences in page size and available address pins. Cross-family alternatives like the 24LC02B series lack the preprogrammed unique ID feature and should only be considered if identification is not required.

Memory IC FAQ

How is the unique 32-bit serial number accessed?

The 32-bit serial number is stored in memory locations 0xFC through 0xFF. It can be read using standard sequential or random read operations via the I²C interface.

Can the unique serial number be modified by the user?

No, the 32-bit serial number is permanently write-protected and programmed at the factory. Only the remaining 1,024 bits of the memory array are available for user modification.

What is the purpose of the manufacturer code and device identifier?

A manufacturer code (0x29) is stored at location 0xFA and a device identifier (0x41) is stored at 0xFB. These codes help identify the component type and family within the memory structure.