25LC040AT-E/ST

Overview

The Microchip Technology 25LC040AT-E/ST is a 4 Kbit (512 x 8-bit) Serial Electrically Erasable PROM. It operates via an SPI-compatible serial 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 is rated for an industrial temperature range of -40°C to +125°C. The component utilizes an 8-lead TSSOP package.

Feature Summary

• Supports sequential read operations and page write modes up to 16 bytes.
• Includes built-in power-on/off data protection circuitry and a write enable latch.
• Features hardware block write protection allowing selection of none, 1/4, 1/2, or all array segments.
• Provides a hold pin to pause communication without resetting the serial sequence.

Applications

• Microcontroller system data storage
• Industrial control applications
• Automotive electronics systems

Procurement Notes

Verify that the specific ordering suffix matches the required automotive temperature grade (-40°C to +125°C) and the TSSOP package type. Confirm the voltage range requirements align with the 2.5V to 5.5V specification. Ensure the design accounts for the 10 MHz maximum clock frequency limits defined in the datasheet electrical characteristics.

Selection Notes

Select this part when an SPI interface is required for non-volatile memory in automotive environments. The 'E' suffix indicates the extended temperature range suitable for harsh conditions. Verify that the system voltage remains within the 2.5V to 5.5V operating window to ensure reliable performance across the specified industrial temperature spectrum.

Part Context

This component belongs to the 25LC040A family of 4K bit serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 25AA040A and 25C040 variants but is distinguished by its specific voltage and temperature ratings. The device is designed for direct interfacing with popular microcontroller families utilizing standard SPI protocols.

Replacement Considerations

Compatible substitutes include other members of the 25LC040A family such as 25LC040AT-I/ST for industrial temperature ranges or 25LC040AT-E/SN for SOIC packaging. Cross-reference the specific suffix codes to ensure exact matching of temperature grades and physical package dimensions before substitution.