25LC040A-I/MS

Overview

The Microchip Technology 25LC040A-I/MS is a 4 Kbit (512 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It utilizes a standard SPI-compatible serial bus for communication, requiring only SCK, SI, SO, and CS lines. The device operates within a supply voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at higher voltages. It features industrial temperature ratings from -40°C to +85°C and is housed in an 8-lead MSOP package.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz.
• Includes built-in write protection mechanisms such as hardware WP pin control and software block protection.
• Features self-timed erase and write cycles with automatic page write capabilities up to 16 bytes.
• Provides data retention exceeding 200 years and endurance of 1,000,000 erase/write cycles.

Applications

• Microcontroller system parameter storage
• Device configuration and calibration data logging
• Non-volatile status flag recording

Procurement Notes

Verify the specific suffix 'I/MS' confirms the Industrial temperature grade (-40°C to +85°C) and the 8-lead MSOP package format. Ensure the design accommodates the 2.5V minimum operating voltage, distinguishing it from lower-voltage variants like the 25AA040A series. Confirm RoHS compliance requirements match the Pb-free JEDEC designation found on official datasheets.

Selection Notes

Select this component when an SPI interface is required for small-scale non-volatile data storage in industrial environments. The 25LC040A-I/MS is suitable for systems operating between 2.5V and 5.5V. Consider the MSOP package dimensions for PCB layout constraints. Verify that the 16-byte page write limit aligns with application write patterns to prevent data wrap-around errors across page boundaries.

Part Context

This part belongs to the 25XX040A family of 4 Kbit Serial EEPROMs manufactured by Microchip Technology. The 'LC' designation indicates a 2.5V to 5.5V operating voltage range, distinct from the 'AA' variant which supports 1.8V. The 'I' suffix denotes the Industrial temperature range, while 'MS' specifies the 8-lead Mini Small Outline Package (MSOP).

Replacement Considerations

The 25LC040A-I/SN serves as a direct pin-compatible replacement using an 8-SOIC package. For applications requiring lower voltage support down to 1.8V, the 25AA040A series is functionally compatible but requires verification of voltage level compatibility.