25AA040A-I/SN

Memory IC Overview

The Microchip Technology 25AA040A-I/SN is a 4 Kbit (512 x 8) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 10 MHz. The device utilizes an SPI-compatible serial bus for communication, featuring a write page mode capable of handling up to 16 bytes per cycle. It includes built-in hardware write protection mechanisms and block write protection capabilities.

Memory IC Feature Summary

• Supports sequential read operations and self-timed erase/write cycles with a maximum duration of 5 ms.
• Features a HOLD pin that allows suspension of serial communication without resetting the sequence, facilitating host interrupt servicing.
• Includes comprehensive data protection via power-on/off circuits, a write enable latch, and a dedicated write-protect pin.

Memory IC Applications

• Microcontroller systems requiring non-volatile storage for configuration parameters
• Data logging applications needing reliable byte-level or page-level memory access
• Embedded devices utilizing standard SPI interfaces for low-power data retention

Memory IC Procurement Notes

Verify the specific suffix 'I/SN' corresponds to Industrial temperature range (-40°C to +85°C) and SOIC-8 package. Confirm RoHS compliance status as specified in the official datasheet. Ensure the ordering part number matches the required voltage range of 1.8V to 5.5V distinct from other variants in the series.

Memory IC Selection Notes

Select this component when interfacing with microcontrollers operating at voltages as low as 1.8V, distinguishing it from the 25LC040A variant which requires a minimum of 2.5V. Consider the SOIC-8 package dimensions for PCB layout constraints. Evaluate the 10 MHz clock speed against system timing requirements to ensure compatibility with the master SPI controller.

Memory IC Part Context

This device belongs to the 25XX040A family of 4 Kbit SPI EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 25LC040A but differs primarily in its lower minimum operating voltage specification. The family is designed for general-purpose non-volatile memory applications requiring high reliability and simple serial interface protocols.

Memory IC Replacement Considerations

The 25LC040A serves as a functional substitute; however, it requires a minimum supply voltage of 2.5V compared to the 1.8V minimum of the 25AA040A. Verify that the target system's VCC rail remains above 2.5V during operation before substituting. Other package variants within the same electrical specification may also be compatible if pinout alignment is confirmed.