25AA640T-I/SN

Memory IC Overview

The Microchip Technology 25AA640T-I/SN is a 64 Kbit Serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a voltage range of 1.8V to 5.5V with a maximum clock frequency of 1 MHz. The device supports industrial temperature ranges from -40°C to +85°C and utilizes an 8192 x 8 bit organization. It includes block write protection, self-timed erase/write cycles, and high reliability with data retention exceeding 200 years.

Memory IC Feature Summary

• Supports serial communication via a standard SPI bus with separate data in and out lines.
• Includes built-in hardware write protection mechanisms and power-on data protection circuitry.
• Features a hold pin that allows pausing transmission without resetting the serial sequence.

Memory IC Applications

• Data storage for microcontroller systems requiring non-volatile memory
• Configuration parameter storage in embedded devices
• Calibration data retention in industrial control applications

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature range (-40°C to +85°C) and 'SN' indicates the SOIC package. Confirm the 'T' prefix denotes tape and reel packaging. Ensure compatibility with the 1.8V to 5.5V supply voltage requirements for your target application environment.

Memory IC Selection Notes

Select this component when a low-power, SPI-compatible EEPROM is required for storing small amounts of non-volatile data. It is suitable for applications needing moderate write endurance and robust data retention. Consider the 32-byte page write capability for efficient data updates.

Memory IC Part Context

This part belongs to the 25XX640 family of serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25LC640 but differs in operating voltage specifications. The datasheet notes it is not recommended for new designs, suggesting the use of updated variants like the 25AA640A or 25LC640A instead.

Memory IC Replacement Considerations

Public confirmed substitute part numbers include 25AA640A-I/SN and 25LC640T-I/SN. Verify voltage range compatibility as the 25LC640 variant may have different minimum supply voltage requirements compared to the 25AA640 series.