25C040XT-I/ST

Memory IC Overview

The Microchip Technology 25C040XT-I/ST is a 4 Kbit (512 x 8-bit) serial Electrically Erasable PROM. It operates within a voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 3 MHz via an SPI-compatible interface. The device features self-timed erase and write cycles with a maximum cycle time of 5 ms. It is housed in an 8-lead TSSOP package and is rated for industrial temperature operation from -40 °C to +85 °C.

Memory IC Feature Summary

• Supports sequential read operations across the memory array
• Includes hardware write protection via the WP pin
• Features built-in power on/off data protection circuitry
• Provides block write protection for specific array segments

Memory IC Applications

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

Memory IC Procurement Notes

Verify that the ordering suffix 'XT' corresponds to the tape and reel packaging format, as distinct from tube packaging. Confirm the 'I' designation indicates the industrial temperature range (-40 °C to +85 °C). Ensure the 'X' suffix matches the required alternate pinout configuration if applicable to the design. Cross-reference the datasheet revision to confirm current status.

Memory IC Selection Notes

Select this component when a 5.0 V supply voltage is required, distinguishing it from lower voltage variants like the 25LC040 or 25AA040. The 3 MHz clock speed offers higher throughput compared to slower EEPROM families. The TSSOP package is suitable for surface mount applications requiring compact footprints. Verify compatibility with the host microcontroller's SPI mode settings.

Memory IC Part Context

This part belongs to the 25XX040 family of 4 Kbit serial EEPROMs. It shares functional similarities with the 25C040 but differs in packaging and pinout configuration due to the 'X' and 'T' suffixes. The device utilizes standard SPI protocols for communication, making it compatible with various digital interfaces found in embedded systems.

Memory IC Replacement Considerations

The 25C040T-I/ST serves as a direct substitute differing only in packaging type (tube versus tape and reel). For designs not requiring the alternate pinout, the standard 25C040-I/ST may be considered. Lower voltage alternatives such as the 25LC040 series require voltage level adjustments.