25AA640AT-I/MS

Memory IC Overview

The Microchip Technology 25AA640AT-I/MS 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 and supports clock frequencies up to 10 MHz at higher voltages. The device utilizes an 8-lead MSOP surface-mount package and is qualified under the AEC-Q100 automotive standard. It functions reliably across an industrial temperature range from -40°C to +85°C.

Memory IC Feature Summary

• Supports high-speed serial communication via a four-wire SPI bus with hold functionality for interrupt servicing
• Includes hardware write protection mechanisms such as block protection, power-on data protection, and a dedicated write-protect pin
• Features self-timed erase and write cycles with automatic internal timing control

Memory IC Applications

• Automotive electronic systems requiring AEC-Q100 qualified nonvolatile memory
• Industrial controllers needing reliable data storage in harsh environments
• Embedded devices utilizing microcontrollers with SPI ports for configuration or calibration data retention

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the presence of the 'T' designation indicates tape and reel packaging if automated assembly is intended. Ensure the component meets RoHS compliance standards for your region. Cross-reference the manufacturer part number with official distributor catalogs to confirm current availability status.

Memory IC Selection Notes

Select this component when low power consumption and high endurance are critical for the application. The wide supply voltage range allows compatibility with various logic levels without external level shifting. Consider the page write size limitations when designing firmware to ensure efficient data writing operations across memory boundaries.

Memory IC Part Context

This device belongs to the 25AA640A family of serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 25LC640A but differs in minimum operating voltage specifications. The family is designed for applications requiring robust data retention and high cycle endurance in compact surface-mount packages.

Memory IC Replacement Considerations

The 25LC640A-I/MS serves as a functional substitute within the same package, though it requires a minimum supply voltage of 2.5V instead of 1.8V.