25CS640T-E/MWF36KVAO

Overview

The Microchip Technology 25CS640T-E/MWF36KVAO is a 64-Kbit (8,192 x 8 bit) SPI Serial EEPROM housed in an 8-pad Wettable Flanks VDFN package. It operates within a voltage range of 1.7V to 5.5V and supports clock frequencies up to 20 MHz at VCC ≥ 4.5V. The device features a self-timed write cycle with a maximum duration of 4 ms. It includes a Security Register containing a factory-programmed 128-bit serial number and user-programmable ID pages. Built-in Error Correction Code (ECC) logic enhances data reliability.

Feature Summary

• Integrated built-in Error Correction Code (ECC) logic capable of correcting single-bit errors within four-byte readouts.
• Configurable Enhanced Write Protection Mode allowing independent memory partitioning with unique protection behaviors.
• Nonvolatile Security Register featuring a globally unique 128-bit serial number and lockable user-programmable ID page.
• Programmable Undervoltage Lockout Detection circuit that inhibits write sequences during brown-out events.

Applications

• Automotive applications requiring AEC-Q100 qualification and extended temperature operation.
• Industrial systems needing reliable nonvolatile memory storage with enhanced write protection.
• Consumer electronics utilizing the SPI interface for compact embedded memory solutions.

Procurement Notes

Verify the specific suffix 'MWF36KVAO' corresponds to the Wettable Flanks VDFN package variant when sourcing. Confirm the 'E' designation indicates Extended temperature range (-40°C to +125°C). Ensure compatibility with SPI Modes 0 and 3. Check for any recent Product Change Notifications regarding pinout or material composition updates.

Selection Notes

Select this component for designs requiring high-reliability EEPROM with ECC support and flexible write protection schemes. The Wettable Flanks VDFN package facilitates automated optical inspection for solder joint quality. Consider the 20 MHz clock speed for high-throughput data logging applications. Verify power supply stability to utilize the programmable undervoltage lockout feature effectively.

Part Context

This part belongs to the 25CS series of Serial EEPROMs from Microchip Technology. It is backward compatible with legacy devices such as the 25AA640A and AT25C640B. The series is optimized for automotive and industrial environments where dependable data retention and security features are critical requirements.

Replacement Considerations

The datasheet explicitly states backward compatibility with the 25AA640A/25LC640A and AT25C640B. These parts may serve as functional substitutes if pinout and electrical characteristics align with the system design constraints.