25AA040A-I/MS

Memory IC Overview

The Microchip Technology 25AA040A-I/MS is a 4 Kbit (512 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It features a maximum clock frequency of 10 MHz and operates within a supply voltage range of 1.8 V to 5.5 V. The device supports industrial temperature ranges from -40°C to +85°C and utilizes an 8-lead MSOP package.

Memory IC Feature Summary

• Supports SPI-compatible serial bus communication with separate data input and output lines.
• Includes hardware write protection via the WP pin and software block protection for array segments.
• Features self-timed erase and write cycles with automatic address pointer incrementation.

Memory IC Applications

• Microcontroller system parameter storage
• Device configuration and calibration data retention
• Embedded status flag recording

Memory IC Procurement Notes

Verify the specific suffix 'I/MS' confirms the Industrial temperature grade (-40°C to +85°C) and the 8-lead MSOP package type. Ensure the ordering code matches the required voltage range of 1.8V to 5.5V, as other variants in the series may have different electrical specifications or package options.

Memory IC Selection Notes

Select this component when a low-pin-count EEPROM is required for small data sets. The MSOP package is suitable for space-constrained designs. Verify that the host microcontroller supports the SPI protocol or can emulate it via GPIO. Confirm the operating voltage aligns with the 1.8V minimum requirement for low-voltage systems.

Memory IC Part Context

This part belongs to the 25XX040A family of 4 Kbit SPI EEPROMs. The 'AA' designation indicates support for voltages down to 1.8 V, distinguishing it from the 'LC' variant which requires a minimum of 2.5 V. The 'I' suffix denotes the industrial temperature rating, while 'MS' specifies the Mini Small Outline Package.

Memory IC Replacement Considerations

The 25LC040A-I/MS is a direct functional substitute but requires a minimum supply voltage of 2.5 V instead of 1.8 V. Other 4 Kbit SPI EEPROMs from different manufacturers require verification of pin compatibility, voltage levels, and command set adherence.