25LC320AX-E/ST

Overview

The Microchip Technology 25LC320AX-E/ST is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 x 8-bit organization. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at 5.5V. The device utilizes an SPI-compatible serial bus with separate data in (SI) and data out (SO) lines, controlled by Chip Select (CS). It includes a 32-byte page buffer for write operations and offers extended temperature support from -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication via SPI interface with hold functionality for interrupt servicing
• Includes hardware write protection through WP pin and STATUS register bits for array security
• Features self-timed erase and write cycles with internal write enable latch management
• Provides block-level write protection allowing selective protection of memory segments

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value storage
• Device identification information logging

Procurement Notes

Verify the specific suffix 'X' against official Microchip documentation to confirm package orientation or marking variations. Ensure the 'E' designation matches the required extended temperature range specifications for your application environment. Cross-reference the TSSOP-8 package dimensions with your PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when extended industrial temperature operation up to 125°C is required alongside standard SPI compatibility. The 25LC320A series provides higher endurance compared to older generations. Consider the 32-byte page size limitations for write efficiency in your software architecture. Verify voltage levels align with the 2.5V minimum requirement for reliable operation.

Part Context

This part belongs to the 25LC320A family of 32-Kbit Serial EEPROMs manufactured by Microchip Technology. The family shares identical functional characteristics but differs in operating voltage ranges and temperature grades. The 'L' variant specifically targets applications requiring a 2.5V minimum supply voltage, distinguishing it from the 'AA' series which supports lower voltages down to 1.8V.

Replacement Considerations

Direct replacements include other 25LC320A variants with different packages such as 25LC320A-I/SN or 25LC320A-E/MS. Ensure substitute parts match the specific temperature grade and voltage requirements of the original design.