25LC640AT-E/SN16KVAO

Overview

The Microchip Technology 25LC640AT-E/SN16KVAO 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 higher voltages. The device features a 32-byte page size, self-timed write cycles with a maximum duration of 5 ms, and high reliability including 1,000,000 erase/write cycle endurance and over 200 years of data retention. It is qualified under AEC-Q100 standards for automotive applications and supports an extended temperature range from -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication via SPI interface with clock frequencies up to 10 MHz.
• Includes built-in hardware write protection mechanisms such as the WP pin and software-controlled block protection bits.
• Features power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Provides a HOLD function to pause serial communication without resetting the sequence.

Applications

• Automotive electronic systems requiring AEC-Q100 qualified non-volatile memory
• Industrial control systems operating in extended temperature environments
• Embedded microcontroller systems needing persistent data storage

Procurement Notes

Verify that the specific suffix '16KVAO' corresponds to the requested packaging or qualification variant, as standard datasheets list generic package types like SOIC-8. Confirm the Extended temperature grade (-40°C to +125°C) matches the application requirements. Ensure the voltage supply aligns with the 2.5V to 5.5V operational range specified for the LC series.

Selection Notes

Select this component when an SPI EEPROM with automotive qualification is required. The Extended temperature grade suits harsh environments. Compare against the Industrial grade version if lower cost is prioritized over the wider thermal range. Ensure the system design accommodates the 32-byte page write limitation and the 5 ms internal write cycle time.

Part Context

This part belongs to the 25LC640A family of 64-Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional specifications with the 25AA640A, differing primarily in the minimum operating voltage. The family supports multiple package options including SOIC, TSSOP, and MSOP, providing flexibility for various PCB layout constraints.

Replacement Considerations

The 25LC640A-I/SN serves as a direct functional substitute with an Industrial temperature range (-40°C to +85°C). The 25AA640A variants offer similar functionality but support a lower minimum voltage of 1.8V. Verify package compatibility and temperature ratings when substituting.