25LC640AT-E/ST16KVAO

Overview

The Microchip Technology 25LC640AT-E/ST16KVAO is a 64-Kbit (8192 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible bus. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 10 MHz at 5.5V. The device features a 32-byte page size, self-timed erase/write cycles with a maximum duration of 5 ms, and high endurance of 1,000,000 write cycles. It includes block write protection for none, 1/4, 1/2, or all of the array, along with power-on/off data protection. The component is qualified to AEC-Q100 standards and operates in extended temperatures from -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication via SPI interface with hold functionality for interrupt servicing
• Includes hardware and software write protection mechanisms with configurable block protection levels
• Features built-in power-on/off data protection circuitry and write enable latch
• Complies with automotive reliability standards including AEC-Q100 qualification

Applications

• Automotive electronic systems requiring non-volatile data storage
• Industrial control applications needing reliable parameter retention
• Embedded microcontroller systems utilizing SPI interfaces

Procurement Notes

Verify the specific ordering suffix '16KVAO' against official Microchip documentation to confirm package type and temperature grade alignment. Confirm AEC-Q100 qualification status for the exact part number variant. Ensure compatibility with system voltage requirements of 2.5V to 5.5V. Check for any recent Product Change Notifications affecting packaging or assembly. Validate that the extended temperature range meets application environmental specifications.

Selection Notes

Select this component when an SPI EEPROM with automotive qualification is required. The extended temperature range (-40°C to +125°C) suits harsh environments. The 32-byte page size allows efficient sequential writes. Consider the 10 MHz clock speed for high-throughput applications. Verify that the 8-lead TSSOP package fits the PCB layout constraints. Ensure the system design accommodates the necessary write protection logic if hardware WP pin usage is intended.

Part Context

This part belongs to the 25LC640A family of 64-Kbit Serial EEPROMs. It shares functional similarities with the 25AA640A but differs in minimum operating voltage. The 'E' designation indicates the extended temperature range. The 'ST' suffix typically denotes the 8-lead TSSOP package. The 'T' indicates tape and reel packaging. This series provides a robust solution for storing calibration data, configuration settings, and user parameters in embedded systems.

Replacement Considerations

Direct replacements include other 25LC640A variants with different packages such as SOIC or MSOP. Cross-reference with 25AA640A if lower voltage operation is acceptable. Verify pinout compatibility for direct substitution. Ensure the replacement maintains the same memory organization and instruction set.