25LC040A-E/MS

Overview

The Microchip Technology 25LC040A-E/MS is a 4 Kbit (512 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It utilizes a standard SPI-compatible serial bus for data access, requiring SCK, SI, SO, and CS signals. The device supports a maximum clock frequency of 10 MHz and operates within a supply voltage range of 2.5V to 5.5V. It features an automotive temperature grade (-40°C to +125°C), 1 million erase/write cycle endurance, and over 200 years of data retention.

Feature Summary

• Supports sequential read operations with automatic address pointer incrementation across the memory array.
• Includes built-in write protection mechanisms such as power-on/off data protection circuitry and a dedicated write-protect pin.
• Features block write protection allowing configuration to protect none, one-quarter, one-half, or all of the memory array.

Applications

• Microcontroller-based systems requiring non-volatile storage for calibration parameters
• Industrial control units needing reliable data logging under high temperature conditions
• Automotive electronic modules storing device identification or status flags

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range aligns with system requirements, as the LC variant differs from AA series options. Ensure compatibility with existing SPI controller configurations regarding clock polarity and phase settings before finalizing procurement.

Selection Notes

Select this component when automotive-grade reliability and extended temperature operation are mandatory. The MSOP package offers a compact surface-mount solution suitable for space-constrained designs. Consider the 16-byte page write capability for efficient data updates while ensuring application logic respects physical page boundaries to prevent data overwrite errors.

Part Context

This part belongs to the 25XX040A family of 4Kbit SPI EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA040A but differs in operating voltage specifications. The E suffix denotes an automotive qualification level, distinguishing it from industrial or commercial variants within the same product line.

Replacement Considerations

Direct substitutes include other 25LC040A variants with different packages such as 25LC040A-I/SN or 25LC040A-E/ST. Verify pinout compatibility and ensure the replacement meets the specific -40°C to +125°C temperature requirement if automotive certification is necessary.