25LC040AX-E/ST

Overview

The Microchip Technology 25LC040AX-E/ST is a 4 Kbit (512 x 8 bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It operates within a supply voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz via an SPI-compatible serial bus. The device features a 16-byte page write mode, self-timed erase and write cycles with a maximum duration of 5 ms, and block write protection capabilities. It is housed in an 8-lead TSSOP package and is rated for an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz
• Includes hardware write-protect pin and software-configurable block protection levels
• Features power-on/off data protection circuitry and a write enable latch
• Provides sequential read capability with automatic address pointer incrementation

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value storage
• Device identification and tracking information

Procurement Notes

Verify the specific ordering suffix 'X' against official Microchip documentation to confirm its exact impact on package marking or testing parameters. Ensure the automotive grade designation 'E' matches the required operating temperature range of -40°C to +125°C for your application environment. Confirm RoHS compliance status through the manufacturer's current environmental declaration.

Selection Notes

Select this component when an SPI interface is required for non-volatile data storage in automotive or industrial environments. The 4Kbit capacity suits applications needing moderate storage for configuration or calibration data. Verify that the 2.5V minimum supply voltage aligns with the system's power rails. Consider the 16-byte page size limitation when designing write algorithms to prevent data wrap-around across page boundaries.

Part Context

This part belongs to the 25LC040A family of serial EEPROMs from Microchip Technology. The 'LC' designation indicates a 2.5V to 5.5V operating voltage range, distinguishing it from the 1.8V compatible 25AA040A series. The 'E' suffix denotes the automotive temperature grade, while 'ST' specifies the 8-lead TSSOP package type.

Replacement Considerations

Direct replacements include other 25LC040A variants with different packages such as SOIC or MSOP, provided the temperature grade and voltage requirements are met. Cross-referencing with the 25AA040A series requires verifying the lower 1.8V supply compatibility.