25AA040T/SN

Memory IC Overview

The Microchip Technology 25AA040T/SN is a 4 Kbit (512 x 8) serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 1 MHz in the Industrial temperature range (-40°C to +85°C). The device utilizes an 8-lead SOIC package with a Tape and Reel suffix indicating bulk packaging. Key electrical characteristics include a typical standby current of 500 nA, write cycle time of 5 ms max, and data retention exceeding 200 years.

Memory IC Feature Summary

• Low-power CMOS technology with minimal active and standby currents
• Hardware write protection via dedicated pin and software-controlled block protection
• Self-timed erase and write cycles with automatic address pointer incrementation
• Communication pause capability through the HOLD input for bus arbitration

Memory IC Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration data logging
• Small-scale non-volatile memory backup

Memory IC Procurement Notes

Verify that the 'T' suffix confirms tape and reel packaging rather than tube or cut tape formats. Confirm the 'SN' designation matches the required 8-lead narrow SOIC footprint dimensions. Ensure the absence of the 'A' suffix indicates compliance with the legacy DS21204E specification rather than the newer A-series datasheet.

Memory IC Selection Notes

Select this component when low-voltage operation down to 1.8V is required alongside standard SPI compatibility. The industrial temperature rating suits general-purpose embedded applications. Note that the datasheet explicitly states this specific part number is not recommended for new designs; consider the 25AA040A series for updated specifications.

Memory IC Part Context

This device belongs to the 25XX040 family of 4 Kbit serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 25LC040 and 25C040 variants but differs in minimum operating voltage and maximum clock speed. The T suffix denotes a specific bulk packaging method distinct from the standard tube distribution.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 25AA040A-I/SN, 25LC040-I/SN.