AT24CSW040-STUM-T

Memory IC Overview

The AT24CSW040-STUM-T is a 4-Kbit (512 x 8) I²C-compatible serial EEPROM manufactured by Microchip Technology. It operates within a supply voltage range of 1.7V to 3.6V and supports clock frequencies up to 1 MHz in Fast Mode Plus. The device features a 256-bit Security Register containing a factory-programmed 128-bit unique serial number and 16 bytes of user-accessible memory. It includes software write protection with five configurable levels that can be permanently locked, alongside hardware write protection via the WP pin. Packaged in a 5-lead TSOT-23, it ensures data retention for 100 years and endurance of 1,000,000 write cycles.

Memory IC Feature Summary

• Integrated 256-bit Security Register providing a permanent 128-bit unique serial number and additional user-programmable storage space.
• Configurable software write protection system offering five distinct array protection levels that can be made permanent.
• Dual-mode write protection capability combining internal software settings with external hardware control via the Write-Protect pin.
• I²C-compatible two-wire interface supporting Standard, Fast, and Fast Mode Plus speeds with Schmitt trigger inputs for noise suppression.

Memory IC Applications

• Industrial systems requiring low-power non-volatile data storage
• Commercial applications needing unique device identification through preprogrammed serial numbers
• Embedded controllers utilizing I²C communication protocols
• Systems requiring secure storage of critical configuration data

Memory IC Procurement Notes

Verify the specific ordering suffix matches the required package type and client address value. Confirm the voltage grade and temperature range align with the target application environment. Ensure the security register requirements are met by the factory-programmed serial number feature. Check datasheet revision history for any updates regarding electrical characteristics or packaging changes before finalizing procurement.

Memory IC Selection Notes

Select this component when a 4-Kbit capacity is sufficient for the application's data storage needs. Choose this part if the design requires a unique hardware identifier without consuming user memory space. Consider the TSOT-23 package for space-constrained PCB layouts. Verify that the I²C bus speed requirements do not exceed the 1 MHz limit at the operating voltage. Ensure the power supply remains stable between 1.7V and 3.6V to maintain reliable operation.

Memory IC Part Context

This device belongs to the AT24CSW04X/AT24CSW08X series of I²C-compatible serial EEPROMs. It shares architectural similarities with other members of the CS and CSW families, particularly regarding the security register structure and write protection mechanisms. The STUM-T suffix indicates the 5-lead TSOT-23 package and tape-and-reel delivery format. It serves as a compact solution for applications demanding both data persistence and device authentication capabilities.

Memory IC Replacement Considerations

Direct replacements include other AT24CSW040 variants with different package options such as WLCSP. Cross-series compatibility should be verified against AT24C04C models, noting differences in security features and write protection architectures. Ensure substitute parts support the same I²C addressing and voltage ranges.