25AA040AX-I/ST

Memory IC Overview

The Microchip Technology 25AA040AX-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 1.8 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 X-Rotated TSSOP package.

Memory IC Feature Summary

• Supports write page mode for up to 16 bytes per cycle
• Includes hardware write protection via the WP pin
• Features built-in power-on/off data protection circuitry
• Allows suspension of communication through the HOLD pin

Memory IC Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value storage in embedded systems

Memory IC Procurement Notes

Verify that the ordering suffix 'X' corresponds to the specific rotated TSSOP package variant required for your PCB layout. Confirm the 'I' designation matches the industrial temperature range specifications for your operational environment. Ensure compatibility with the 1.8V minimum supply voltage requirement before finalizing procurement.

Memory IC Selection Notes

Select this component when a low-voltage EEPROM interface is required for space-constrained designs. The X-Rotated TSSOP package offers a compact footprint suitable for high-density boards. Consider the 1.8V operating range if the host system utilizes lower voltage logic levels compared to standard 5V or 3.3V systems.

Memory IC Part Context

This part belongs to the 25XX040A family, which includes variants like the 25LC040A. The 'AA' prefix indicates a 1.8V minimum operating voltage, distinguishing it from the 'LC' series which requires a 2.5V minimum. The 'X' suffix specifically denotes the rotated TSSOP package orientation.

Memory IC Replacement Considerations

Direct substitutes include other 25AA040A variants with different packages such as SOIC or MSOP. Cross-series replacements like the 25LC040A are possible but require verifying the minimum supply voltage constraints.