25C040/SN

Memory IC Overview

The Microchip Technology 25C040/SN is a 4 Kbit (512 x 8-bit) serial Electrically Erasable PROM housed in an 8-lead Plastic Small Outline (SOIC, 150 mil body) package. It operates within a voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 3 MHz. The device utilizes a Serial Peripheral Interface (SPI) compatible bus for data transfer, featuring separate Clock (SCK), Data In (SI), and Data Out (SO) lines controlled by Chip Select (CS). It includes hardware write protection via the WP pin and supports block-level array protection.

Memory IC Feature Summary

• Hardware write protection enabled by the Write-Protect (WP) pin to inhibit programming operations
• Block write protection allowing selective protection of none, one-quarter, one-half, or all memory segments
• Built-in power-on/off data protection circuitry with automatic write enable latch reset on power-up
• Serial Hold (HOLD) functionality to pause transmission without resetting the communication sequence

Memory IC Applications

• Industrial control systems requiring non-volatile data storage
• Automotive electronics operating within extended temperature ranges
• Microcontroller-based embedded systems needing configuration parameter retention

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range aligns with the system supply, as this variant requires 4.5 V to 5.5 V. Check for current manufacturer recommendations regarding new designs, as updated series may be suggested. Ensure compliance with export regulations if applicable to the destination region.

Memory IC Selection Notes

Select this component when a 5.0 V nominal supply is available and automotive-grade temperature performance is required. Compare against the 25LC040 for lower voltage operation or the 25AA040 for wider voltage flexibility. Consider the SOIC package dimensions for PCB layout constraints. Verify SPI bus compatibility with the host microcontroller's interface capabilities.

Memory IC Part Context

This part belongs to the 25XX040 family of 4 Kbit serial EEPROMs from Microchip Technology. It shares architectural similarities with the 25AA040 and 25LC040 but is distinguished by its specific voltage requirements and industrial/automotive temperature ratings. The SN suffix denotes the narrow plastic small outline package format.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 25C040-I/P, 25C040-E/P.