25LC040AT-M/SN

Overview

The Microchip Technology 25LC040AT-M/SN is a 4 Kbit (512 x 8) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It utilizes an SPI-compatible serial bus for data access, featuring a maximum clock frequency of 10 MHz. The device operates within a supply voltage range of 2.5V to 5.5V and supports industrial temperature ranges. It includes block write protection, self-timed erase/write cycles with a maximum duration of 5 ms, and high reliability characteristics including over 1,000,000 endurance cycles and greater than 200 years of data retention.

Feature Summary

• Supports sequential read operations and page write mode with up to 16 bytes per page.
• Includes built-in hardware write protection via the WP pin and software-controlled block protection.
• Features power-on/off data protection circuitry and a write enable latch mechanism.
• Allows communication pausing via the HOLD pin without resetting the serial sequence.

Applications

• Microcontroller system data storage
• Configuration parameter storage
• Calibration data retention

Procurement Notes

Verify the specific suffix 'M' against official documentation to confirm package or qualification details. Confirm RoHS compliance status and export control requirements prior to ordering. Ensure the selected variant matches the required operating temperature range and voltage specifications for the target application environment.

Selection Notes

Select this component when a 4 Kbit non-volatile memory solution with SPI interface is required. Consider the 10 MHz clock speed for higher throughput needs compared to lower-speed variants. Verify that the SOIC-8 package fits the PCB layout constraints and that the 2.5V minimum voltage aligns with the system power rails.

Part Context

This part belongs to the 25LC040A family of 4 Kbit Serial EEPROMs manufactured by Microchip Technology. The family shares common architectural features but varies in voltage ranges, temperature grades, and physical packages. The 'SN' suffix indicates an 8-lead SOIC package, while the 'AT' designation typically relates to specific manufacturing or packaging attributes within the product line.

Replacement Considerations

Compatible substitutes include other 25LC040 variants from the same family, such as 25LC040T-I/SN or 25LC040-E/MC, provided they match the required voltage, temperature, and package specifications.