25LC040AXT-E/ST

Overview

The Microchip Technology 25LC040AXT-E/ST is a 4 Kbit (512 x 8) serial electrically erasable PROM. It operates on an SPI-compatible bus with SCK, SI, SO, and CS signals. The device supports a maximum clock frequency of 10 MHz at VCC levels between 4.5V and 5.5V. It functions within a supply voltage range of 2.5V to 5.5V and withstands temperatures from -40°C to +125°C. The component utilizes TSSOP-8 packaging.

Feature Summary

• Supports sequential read operations and page write modes for up to 16 bytes.
• Includes built-in power-on/off data protection circuitry and a write enable latch.
• Features hardware write protection via the WP pin and software-selectable block protection.

Applications

• Microcontroller system configuration storage
• Calibration data retention in industrial sensors
• Parameter logging in automotive electronic control units

Procurement Notes

Verify that the ordering suffix 'E' confirms the Automotive temperature grade (-40°C to +125°C). Confirm the '/ST' designation matches the required TSSOP-8 package type. Ensure the 'XT' suffix aligns with the specific reel quantity requirements for your manufacturing line.

Selection Notes

Select this part when an SPI interface is required for non-volatile storage in high-reliability environments. The Automotive grade ensures stability across extreme thermal conditions. Verify that the 512-byte capacity meets the application's data retention needs without requiring external memory expansion.

Part Context

This component belongs to the 25LC040A family of serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 25AA040A but differs in minimum operating voltage specifications. The device is designed for direct integration into standard SPI communication buses found in modern embedded systems.

Replacement Considerations

25LC040AT-I/ST