25LC040AT-E/MS

Overview

The Microchip Technology 25LC040AT-E/MS is a 4 Kbit (512 x 8) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It operates within a supply voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz. The device utilizes an SPI-compatible serial bus for data access and features a write page mode capable of handling up to 16 bytes per cycle. It is housed in an 8-lead MSOP package and is rated for an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz
• Includes hardware write protection via the WP pin and software block protection settings
• Features a HOLD input to pause serial transmission without resetting the sequence
• Provides built-in power-on/off data protection circuitry

Applications

• Microcontroller system data storage
• Industrial control applications requiring extended temperature operation
• Automotive electronic modules
• Embedded systems needing non-volatile parameter retention

Procurement Notes

Verify that the specific ordering suffix matches the required automotive temperature grade (-40°C to +125°C) and the MSOP package type. Confirm RoHS compliance status and ensure export documentation requirements are met if applicable. Cross-reference the manufacturer part number with official datasheets to validate functional specifications before procurement.

Selection Notes

Select this component when an SPI EEPROM requires operation at voltages as low as 2.5V while maintaining high-speed performance up to 10 MHz. The automotive temperature grade makes it suitable for harsh environments where standard industrial grades may fail. Ensure the application design accommodates the 16-byte page write limitation and utilizes the available block protection features for data integrity.

Part Context

This part belongs to the 25LC040A family of 4 Kbit Serial EEPROMs manufactured by Microchip Technology. The 'E' suffix denotes the automotive temperature grade, distinguishing it from the standard industrial 'I' grade variant. The 'MS' suffix indicates the 8-lead Mini Small Outline Package (MSOP), providing a compact surface-mount solution compared to larger PDIP or SOIC packages.

Replacement Considerations

The 25LC040AT-I/MS serves as a direct functional substitute with identical electrical characteristics but a reduced operating temperature range of -40°C to +85°C. Verify that the ambient conditions of the target application remain within the limits of the industrial grade variant before swapping.