25LC320AT-E/MS

Overview

The Microchip Technology 25LC320AT-E/MS is a 32-Kbit Serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 10 MHz at higher voltages. The device utilizes a 4096 x 8-bit organization with a 32-byte page size. It is housed in an 8-lead MSOP package and supports an extended temperature range from -40°C to +125°C.

Feature Summary

• Supports serial communication via a four-wire SPI bus including Chip Select, Serial Clock, Serial Data Input, and Serial Data Output lines.
• Includes hardware write protection controlled by the WP pin and internal STATUS register bits for array security.
• Features a HOLD input that allows suspension of serial data transmission without resetting the current sequence.
• Provides self-timed erase and write cycles initiated by the Chip Select signal transition.

Applications

• Data storage in microcontroller systems requiring non-volatile memory
• Configuration parameter retention in industrial control devices
• Calibration data storage in automotive electronic modules

Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature rating (-40°C to +125°C) and 'MSOP' identifies the correct surface-mount package. Confirm the 'T' indicates tape-and-reel packaging if required for automated assembly. Ensure the component matches the official Microchip datasheet specifications for electrical characteristics and pinout compatibility before integration.

Selection Notes

Select this component when an SPI interface is preferred over I2C or parallel architectures. The 2.5V minimum supply voltage distinguishes it from lower-voltage variants like the 25AA320A. The MSOP package is suitable for applications requiring compact surface-mount footprints. Verify that the system design accommodates the maximum 10 MHz clock frequency requirements.

Part Context

This part belongs to the 25XX320A family of 32-Kbit EEPROMs manufactured by Microchip Technology. The family includes variants with different voltage ranges (1.8V vs 2.5V), temperature grades (Industrial vs Extended), and physical packages (PDIP, SOIC, TSSOP). The 25LC320AT-E/MS specifically combines the extended temperature grade with the MSOP package form factor.

Replacement Considerations

Direct substitutes include other 25LC320A variants with identical electrical specifications but different packages, such as 25LC320A-E/SN (SOIC) or 25LC320A-E/ST (TSSOP). Cross-manufacturer equivalents must be verified against the SPI timing parameters and voltage tolerances specified in the official datasheet.