25LC256XT-E/ST

Overview

The Microchip Technology 25LC256XT-E/ST is a 256 Kbit (32,768 x 8-bit) Serial Electrically Erasable PROM. It utilizes an SPI-compatible serial bus interface with SCK, SI, SO, and CS pins. The device operates within a supply voltage range of 2.5 V to 5.5 V and supports a maximum clock frequency of 10 MHz. It features a 64-byte page size for write operations and includes block write protection capabilities. The component is housed in an 8-lead TSSOP package and is rated for extended temperature operation from -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication via a standard SPI-compatible bus interface.
• Includes hardware write protection mechanisms such as a dedicated WP pin and software-controlled block protection bits.
• Features a HOLD input pin that allows the host to pause serial data transmission without resetting the sequence.

Applications

• Data storage for configuration parameters in microcontroller systems
• Non-volatile memory for firmware or calibration data logging
• Embedded system components requiring reliable long-term data retention

Procurement Notes

Verify the specific ordering suffix 'T' against official Microchip documentation to confirm tape-and-reel packaging specifications. Ensure the 'E' designation matches the required extended industrial temperature range (-40°C to +125°C). Confirm RoHS compliance status and check for any recent Product Change Notifications (PCN) regarding package or material updates prior to finalizing procurement.

Selection Notes

Select this component when a 256 Kbit capacity is required with SPI interface compatibility. The extended temperature grade ('E') is necessary for environments exceeding standard industrial limits. Verify that the system voltage remains within the 2.5 V to 5.5 V operating range. Consider the 64-byte page write limit and block protection requirements during system architecture design.

Part Context

This part belongs to the 25LC256 family of Serial EEPROMs manufactured by Microchip Technology. It shares functional characteristics with the 25AA256 variant, differing primarily in operating voltage ranges. The device is designed for applications requiring non-volatile data storage with low power consumption and high endurance, serving as a direct replacement for legacy parallel EEPROMs in space-constrained designs.

Replacement Considerations

Consult official Microchip substitution guides for verified equivalents. Cross-reference pinouts and electrical characteristics carefully when replacing with other SPI EEPROMs. Ensure voltage levels and temperature ratings match the original design constraints before implementing substitutes.