25AA02UIDT-I/OT

Memory IC Overview

The Microchip Technology 25AA02UIDT-I/OT is a 2 Kbit Serial Electrically Erasable Programmable Read-Only Memory (EEPROM) featuring a preprogrammed, unique 32-bit serial number. It utilizes an SPI-compatible interface with a maximum clock frequency of 10 MHz and operates within a supply voltage range of 1.8V to 5.5V. The device offers a 256 x 8-bit organization with write page mode supporting up to 16 bytes. It includes block write protection, self-timed erase/write cycles of 5 ms max, and high reliability with 1,000,000 erase/write cycles endurance and over 200 years data retention.

Memory IC Feature Summary

• Preprogrammed 32-bit unique serial number stored in the upper quarter of the array
• SPI compatible serial bus interface with hold functionality for interrupt servicing
• Hardware and software write protection mechanisms including block protection and power-on/off data protection
• High reliability with extended data retention and enduranc

Memory IC Applications

• Device identification and serialization in manufacturing
• Secure storage of unique identifiers in embedded systems
• Data logging applications requiring non-volatile memory
• Industrial control systems needing reliable parameter storage

Memory IC Procurement Notes

Verify the specific suffix 'I/OT' corresponds to the Industrial temperature range (-40°C to +85°C) and SOT-23-6 package as documented in the official datasheet. Confirm RoHS compliance status matches current regulatory requirements. Ensure the ordering part number aligns with the manufacturer's latest revision to avoid discrepancies in pinout or electrical characteristics during procurement.

Memory IC Selection Notes

Select this component when a unique hardware identifier is required alongside standard EEPROM functionality. The 25AA02UID series is suitable for applications demanding secure device tracking without external authentication modules. Consider the SPI interface compatibility with the host microcontroller and verify that the SOT-23-6 package fits the PCB layout constraints. Evaluate the need for the factory-programmed UID versus user-writable memory space.

Memory IC Part Context

This device belongs to the 25AA02UID family of serial EEPROMs from Microchip Technology. It shares the core architecture with other 2Kbit SPI EEPROMs but is distinguished by its factory-programmed unique ID. The 'UID' designation specifically indicates the presence of the 32-bit serial number, differentiating it from standard variants like the 25AA020A which lack this feature.

Memory IC Replacement Considerations

Direct replacements include other 25AA02UID variants with different packages such as SOIC-8 (e.g., 25AA02UIDT-I/SN). Cross-referencing with similar Microchip UID-series devices ensures functional compatibility regarding the unique ID structure and SPI protocol.

Memory IC FAQ

Is the 32-bit serial number user-writable?

No, the 32-bit serial number is preprogrammed at the factory and is write-protected by default in the upper quarter of the array.

Can the write protection on the serial number be disabled?

Yes, the Block Protection bits (BP1 and BP0) in the STATUS register can be modified via the WRSR instruction, allowing writes to the upper quarter, though this risks overwriting the serial number.

What is the purpose of the HOLD pin?

The HOLD pin allows the host to pause serial communication without resetting the sequence, enabling the system to service higher priority interrupts while maintaining the current state.