25LC040AT-H/SN

Overview

The Microchip Technology 25LC040AT-H/SN is a 4K-bit (512 x 8) Serial Electrically Erasable PROM utilizing SPI-compatible communication. It operates within a voltage range of 2.5V to 5.5V and supports maximum clock frequencies of 5 MHz at voltages between 4.5V and 5.5V, or 3 MHz at 2.5V to less than 4.5V. The device features an extended temperature range from -40°C to +150°C and is housed in an 8-lead SOIC package.

Feature Summary

• Supports serial communication via standard SPI bus with separate data input and output lines controlled by chip select.
• Includes hardware write protection through the WP pin and software block protection for selective array security.
• Features a HOLD pin that allows suspension of serial transmission without resetting the internal address pointer.

Applications

• Industrial control systems requiring high-temperature reliability
• Automotive electronics operating under extreme thermal conditions
• Data logging devices needing non-volatile storage

Procurement Notes

Verify the specific suffix 'H' confirms the extended temperature rating (-40°C to +150°C). Confirm the 'SN' designation indicates the 8-lead SOIC package. Ensure compatibility with system voltage levels, as performance varies between 2.5V and 5.5V ranges. Check export compliance requirements if applicable.

Selection Notes

Select this component when applications demand operation beyond standard industrial limits up to 150°C. The 4K capacity suits small data storage needs. Verify that the host microcontroller supports the required SPI modes and that the 8-pin SOIC footprint fits the PCB layout constraints.

Part Context

This part belongs to the 25LCXXXA family of low-density serial EEPROMs. It shares architectural similarities with other densities like the 25LC010A and 25LC020A but offers higher storage density. The 'A' suffix denotes updated specifications compared to earlier versions, while the 'H' grade specifically targets harsh environments.

Replacement Considerations

Direct replacements include other 25LC040 variants with matching temperature grades and packages. Verify that substitute parts support the same 5 MHz maximum speed at the target supply voltage and maintain identical pin configurations for seamless integration.