25LC040AT-I/SN

Overview

The Microchip Technology 25LC040AT-I/SN is a 4 Kbit (512 x 8) 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. The device utilizes an SPI-compatible serial bus for data access, featuring a write page mode capable of handling up to 16 bytes per cycle. It includes self-timed erase and write cycles with a maximum duration of 5 ms. The component is housed in an 8-SOIC package and is rated for industrial temperature operation from -40°C to +85°C.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz
• Includes hardware write protection via the WP pin and software block protection settings
• Features automatic address pointer incrementation for sequential read operations
• Provides power-on/off data protection circuitry to prevent inadvertent writes

Applications

• Microcontroller system configuration storage
• Calibration data retention in embedded devices
• Parameter logging for industrial sensors
• Non-volatile memory backup for real-time clocks

Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature grade (-40°C to +85°C) and 'SN' indicates the 8-SOIC package. Confirm the 'T' suffix matches the required tape and reel packaging format rather than tube or cut tape. Ensure the specific revision level aligns with current manufacturing notices before finalizing procurement orders.

Selection Notes

Select this part when a 4 Kbit EEPROM interface is required with SPI compatibility and industrial temperature resilience. The 2.5V to 5.5V operating range allows flexibility in system power design. Consider the 10 MHz clock speed for applications requiring faster data throughput compared to lower-frequency variants. Verify that the 8-SOIC package dimensions fit the available PCB footprint constraints.

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 requirements. The device is designed to replace older generation serial EEPROMs in modern embedded systems where low power consumption and reliable non-volatile data storage are critical requirements.

Replacement Considerations

Direct substitutes include other 25LC040A variants with different packages such as 25LC040AT-I/ST or 25LC040AT-E/SN. Cross-referencing datasheets is necessary to confirm voltage ranges and temperature grades match the original design specifications.