25C040X-I/ST

Memory IC Overview

The Microchip Technology 25C040X-I/ST is a 4 Kbit (512 x 8-bit) serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a voltage range of 4.5 V to 5.5 V with a maximum clock frequency of 3 MHz. The device supports industrial temperature ranges from -40 °C to +85 °C and utilizes an 8-lead TSSOP package. Key specifications include a typical read current of 500 μA, write cycle time of 5 ms max, and endurance of 1 million cycles.

Memory IC Feature Summary

• Supports sequential read operations with automatic address pointer incrementation for continuous data retrieval.
• Includes hardware write protection via the WP pin and software block protection through the STATUS register.
• Features a HOLD input to pause serial communication without resetting the sequence or requiring retransmission.

Memory IC Applications

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

Memory IC Procurement Notes

Verify that the specific 'X' suffix indicates the alternate pinout configuration available only in the ST package type. Confirm the operating voltage requirements align with the 4.5 V to 5.5 V specification for the 25C040 series. Ensure the industrial temperature grade meets the application's environmental constraints.

Memory IC Selection Notes

Select this component when a 5V supply domain is required alongside SPI connectivity. The 25C040X variant offers a distinct pin arrangement compared to standard packages. Consider the 16-byte page write capability for efficient data management. Verify compatibility with the host controller's SPI mode settings.

Memory IC Part Context

This part belongs to the 25XX040 family of 4 Kbit serial EEPROMs. It shares architectural similarities with the 25AA040 and 25LC040 but is distinguished by its higher minimum operating voltage. The datasheet notes it is not recommended for new designs, suggesting newer alternatives.

Memory IC Replacement Considerations

Consider the 25AA040A or 25LC040A as recommended replacements per the manufacturer's documentation. These updated devices maintain similar functionality while addressing design lifecycle recommendations.