25AA640AT-I/SN

Memory IC Overview

The Microchip Technology 25AA640AT-I/SN is a 64-Kbit Serial Electrically Erasable PROM utilizing an SPI-compatible interface. It features an 8192 x 8-bit organization with a 32-byte page size and operates within a voltage range of 1.8V to 5.5V. The device supports a maximum clock frequency of 10 MHz at 5.5V, with reduced speeds at lower voltages. It includes block write protection, self-timed erase/write cycles of 5 ms maximum, and high reliability with over 1,000,000 erase/write cycles and data retention exceeding 200 years. The component is housed in an 8-lead SOIC package and is qualified for automotive applications under AEC-Q100 standards.

Memory IC Feature Summary

• Supports serial communication via a standard SPI bus with separate data input and output lines.
• Includes hardware write protection controlled by the WP pin and STATUS register bits.
• Features power-on/off data protection circuitry and a write enable latch mechanism.
• Provides a HOLD function to pause serial transmission without resetting the sequence.

Memory IC Applications

• Microcontroller system data storage
• Automotive electronic modules
• Industrial control systems

Memory IC Procurement Notes

Verify that the ordering suffix 'SN' corresponds to the 8-lead SOIC package and 'I' indicates the industrial temperature range (-40°C to +85°C). Confirm the 'T' suffix denotes tape and reel packaging if required for automated assembly. Ensure compatibility with the 1.8V to 5.5V supply voltage requirements of the target application.

Memory IC Selection Notes

Select this part for applications requiring non-volatile memory with SPI connectivity and low power consumption. Consider the 1.8V minimum operating voltage for compatibility with modern low-voltage logic families. Verify that the 32-byte page write limit aligns with the software architecture's ability to manage page boundaries correctly.

Memory IC Part Context

This component belongs to the 25XX640A family of 64-Kbit serial EEPROMs manufactured by Microchip Technology. The family shares identical functional specifications but differs in operating voltage ranges and specific package options. The 25AA variant specifically supports the 1.8V to 5.5V range, distinguishing it from the 25LC variant which typically requires a higher minimum voltage.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 25AA640A-I/SN, 25LC640A-I/SN.