25LC040A-M/P

Overview

The Microchip Technology 25LC040A-M/P is a 4 Kbit (512 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It features an SPI-compatible serial bus interface with a maximum clock frequency of 10 MHz. The device operates within a supply voltage range of 2.5V to 5.5V and supports industrial temperature grades from -40°C to +85°C. It utilizes low-power CMOS technology, offering high endurance and data retention capabilities.

Feature Summary

• Supports sequential read operations and page write modes for efficient data handling.
• Includes built-in hardware write protection via the WP pin and software-based block protection.
• Features self-timed erase and write cycles with automatic internal timing control.

Applications

• Microcontroller system parameter storage
• Device configuration and calibration data logging
• Embedded application code or data backup

Procurement Notes

Verify the specific suffix 'M' against official Microchip documentation to confirm package type and availability, as standard listings typically reference PDIP or SOIC variants. Confirm RoHS compliance status and ensure the ordering quantity matches manufacturer minimums. Validate that the required temperature grade aligns with your operational environment specifications before finalizing procurement.

Selection Notes

Select this component when a 4Kbit non-volatile memory solution is required with SPI compatibility. Ensure the system voltage remains above 2.5V, as lower voltages are not supported by this variant. Consider the 8-pin PDIP package for through-hole prototyping or manufacturing needs where surface-mount options are unsuitable.

Part Context

This part belongs to the 25AA040A/25LC040A family of 4K SPI Bus Serial EEPROMs. The 'LC' designation indicates a 2.5V to 5.5V operating range, distinguishing it from the 'AA' series which supports 1.8V systems. The 'P' suffix denotes an 8-lead PDIP package, while the 'M' suffix requires verification in official datasheets for exact physical dimensions.

Replacement Considerations

The 25LC040A serves as a direct functional replacement for the legacy 25LC040. Verify that the original design accommodates the updated 10 MHz maximum clock speed and confirm that the 2.5V minimum voltage requirement does not conflict with existing power rails.