25LC640A-E/P

Overview

The Microchip Technology 25LC640A-E/P is a 64-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 an 8-Lead PDIP package and is qualified for the Extended temperature range, functioning reliably from -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication via a standard SPI bus with separate data input and output lines.
• Includes built-in hardware write protection mechanisms utilizing a dedicated pin and internal status register bits.
• Features power-on/off data protection circuitry to prevent inadvertent writes during power transitions.

Applications

• Data logging in industrial control systems
• Configuration storage for embedded microcontrollers
• Parameter retention in automotive electronic modules

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range aligns with system requirements, as the LC variant differs from AA series specifications. Ensure compatibility with existing SPI controller configurations before finalizing procurement.

Selection Notes

Select this component when extended temperature operation is mandatory for the application environment. The PDIP package facilitates through-hole mounting on prototyping boards or ruggedized PCB layouts. Verify that the 2.5V minimum supply voltage meets the lowest operating condition of the target system.

Part Context

This part belongs to the 25LC640A family of 64-Kbit EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 25AA640A but is distinguished by its specific voltage operating range. The E suffix designates the extended temperature capability suitable for demanding environments.

Replacement Considerations

The 25LC640A-I/P serves as a direct functional substitute if the industrial temperature range (-40°C to +85°C) suffices for the application. Other variants within the 25LC640A family may be considered provided they match the required package style and voltage specifications.