25LC640A-E/SN

Overview

The Microchip Technology 25LC640A-E/SN 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 SOIC package and is qualified for the Extended temperature range of -40°C to +125°C. It includes built-in write protection, self-timed erase/write cycles, and high endurance specifications.

Feature Summary

• Supports serial communication via standard SPI bus signals including SCK, SI, SO, and CS.
• Includes hardware write protection controlled by the WP pin and STATUS register bits.
• Features automatic address pointer incrementation for sequential read operations.
• Provides internal write cycle management with self-timed programming.

Applications

• Data storage in industrial control systems requiring extended temperature operation
• Configuration memory for microcontrollers utilizing SPI interfaces
• Parameter logging in automotive electronics environments

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range aligns with system power rails, as this variant specifies a minimum operating voltage. Ensure compatibility with host controller SPI modes before integration into production designs.

Selection Notes

Select this component when extended temperature performance is mandatory alongside standard SPI connectivity. Compare against the Industrial grade variant if lower ambient temperatures suffice. Consider page write boundaries and block protection requirements during system architecture planning to optimize data integrity strategies.

Part Context

This part belongs to the 25LC640A family of 64-Kbit EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA640A series but differs in supply voltage specifications. The device is designed for non-volatile data retention in embedded applications requiring reliable storage without volatile power dependency.

Replacement Considerations

Public confirmed substitute: 25LC640A-I/SN