25LC040AT-E/OT16KVAO

Overview

The Microchip Technology 25LC040AT-E/OT is a 4 Kbit (512 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible bus. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz. The device features a 6-lead SOT-23 package and is rated for an extended temperature range of -40°C to +125°C. Key electrical characteristics include a typical read current of 5 mA at 5.5V, standby current of 5 µA, and a self-timed write cycle time of 5 ms maximum.

Feature Summary

• Supports sequential read operations with automatic address pointer incrementation across the memory array.
• Includes built-in hardware write protection mechanisms such as power-on/off data protection and a dedicated write-protect pin.
• Features a hold input that allows communication pausing without resetting the serial sequence or losing state.

Applications

• Microcontroller systems requiring non-volatile storage for configuration parameters
• Data logging applications in automotive environments due to extended temperature ratings
• Embedded devices utilizing SPI interfaces for low-power data retention

Procurement Notes

Verify the specific suffix 'E' confirms the Automotive grade (-40°C to +125°C) and 'OT' indicates the 6-lead SOT-23 package. Confirm RoHS compliance status matches project requirements. Ensure the source document explicitly lists this exact part number variant to avoid confusion with Industrial grade or different package options.

Selection Notes

Select this component when an SPI EEPROM requires operation up to 10 MHz and fits within a 6-lead SOT-23 footprint. It is suitable for designs needing robust write protection and high endurance. Compare against the 25AA040A if lower voltage support down to 1.8V is required instead of the 2.5V minimum.

Part Context

This part belongs to the 25LC040A family of 4K SPI Bus Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA040A but differs in supply voltage ranges and operating temperature specifications. The 'A' designation indicates an updated revision of the original 25LC040 series.

Replacement Considerations

Public confirmed substitute part numbers: 25LC040AT-I/OT, 25LC040AT-E/SN, 25LC040AT-E/MC.