25LC640A-I/SN

Overview

The Microchip Technology 25LC640A-I/SN is a 64-Kbit (8192 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible serial 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 industrial temperature ratings from -40°C to +85°C, housed in an 8-lead SOIC package.

Feature Summary

• Supports sequential read operations with automatic address pointer incrementation
• Includes built-in write protection mechanisms such as power-on/off data protection and a write enable latch
• Features block write protection allowing selective array segment locking
• Provides a hold pin capability to pause serial communication without resetting the sequence

Applications

• Microcontroller system data storage
• Industrial control applications
• Automotive electronics systems
• General-purpose non-volatile memory retention

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range aligns with the LC variant specifications rather than the AA variant. Ensure compliance with RoHS standards for the intended deployment environment.

Selection Notes

Select this component when a low-pin-count EEPROM interface is required for space-constrained designs. The SOIC package offers surface-mount convenience while maintaining standard SPI compatibility. Consider the 10 MHz maximum clock speed for high-throughput data transfer requirements.

Part Context

This part belongs to the 25XX640A family of 64-Kbit Serial EEPROMs manufactured by Microchip Technology. The 'LC' designation indicates a 2.5V minimum operating voltage, distinguishing it from the 'AA' series which supports lower voltages down to 1.8V. Both variants share identical functional architectures and pinouts.

Replacement Considerations

The 25AA640A-I/SN serves as a direct functional substitute within the same package, offering broader voltage support down to 1.8V. Other compatible replacements include variants with different packaging options such as MSOP or PDIP, provided the pinout remains consistent.