25LC040AXT-I/ST

Overview

The Microchip Technology 25LC040AXT-I/ST is a 4 Kbit (512 x 8) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It operates within a supply voltage range of 2.5 V to 5.5 V and supports a maximum clock frequency of 10 MHz via an SPI-compatible serial bus. The device features industrial temperature ratings from -40°C to +85°C and utilizes an 8-lead TSSOP package with X-Rotated pinout configuration.

Feature Summary

• Supports sequential read operations and page write modes for up to 16 bytes per cycle.
• Includes hardware write protection via the WP pin and software block protection through the STATUS register.
• Features built-in power-on/off data protection circuitry and a write enable latch mechanism.

Applications

• Microcontroller system data storage
• SPI bus peripheral memory expansion
• Industrial control applications

Procurement Notes

Verify that the specific ordering suffix 'XT' corresponds to the tape and reel packaging format as indicated by distributor listings, while ensuring the base part number matches the official datasheet specifications. Confirm the 'I' designation aligns with the required industrial temperature range of -40°C to +85°C for your application environment.

Selection Notes

Select this component when a low-pin-count EEPROM solution is required for systems utilizing standard SPI interfaces. The 2.5 V minimum operating voltage makes it suitable for mid-range logic families, while the 10 MHz clock speed provides adequate throughput for general-purpose non-volatile storage tasks in embedded designs.

Part Context

This component belongs to the 25LC040A family of 4 Kbit Serial EEPROMs manufactured by Microchip Technology. The family shares identical functional architectures across various package types, including SOIC, PDIP, MSOP, and SOT-23, allowing for flexible layout options while maintaining consistent electrical characteristics and instruction sets.

Replacement Considerations

Compatible substitutes include other variants within the 25LC040A series such as 25LC040AT-I/ST or 25LC040A-I/SN, provided the package footprint and pinout orientation are compatible with the existing PCB design.