25LC040AX-I/ST

Overview

The Microchip Technology 25LC040AX-I/ST is a 4 Kbit (512 x 8) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It operates within a supply voltage range of 2.5 V to 5.5 V and supports a maximum clock frequency of 10 MHz via an SPI-compatible serial bus. The device features industrial temperature ratings from -40°C to +85°C and is housed in an 8-lead TSSOP package.

Feature Summary

• Supports write page mode for up to 16 bytes and sequential read operations.
• Includes built-in hardware write protection with power-on/off data protection circuitry.
• Features a hold pin to pause serial communication without resetting the sequence.

Applications

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

Procurement Notes

Verify that the ordering suffix 'X' corresponds to the rotated TSSOP package variant as specified in the datasheet. Confirm the 'I' suffix indicates the industrial temperature grade (-40°C to +85°C). Ensure the component meets RoHS compliance requirements for your specific assembly process.

Selection Notes

Select this part when a 4 Kbit non-volatile memory solution is required with SPI interface compatibility. It is suitable for applications needing hardware write protection and low standby current. Consider the 8-lead TSSOP form factor for surface-mount designs requiring compact footprint.

Part Context

This component belongs to the 25LC040A family of serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA040A but differs in minimum operating voltage specifications. The family offers various package options including SOIC, MSOP, and DFN.

Replacement Considerations

Direct substitutes include other 25LC040A variants with different packages or temperature grades, such as 25LC040A-I/SN or 25LC040AT-E/MC. Verify package dimensions and voltage ranges before substitution.