25AA040/SN

Memory IC Overview

The Microchip Technology 25AA040/SN is a 4 Kbit (512 x 8-bit) serial Electrically Erasable PROM. It utilizes a Serial Peripheral Interface (SPI) compatible bus for data access, requiring SCK, SI, SO, and CS signals. The device operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 1 MHz. It features industrial temperature operation from -40°C to +85°C and is housed in an 8-lead Plastic Small Outline (SOIC) package.

Memory IC Feature Summary

• Low-power CMOS technology with typical standby current of 500 nA
• Built-in write protection including power-on/off circuitry and hardware WP pin
• Self-timed erase and write cycles with block write protection capabilities
• High reliability with 1M cycle endurance and over 200 years data retention

Memory IC Applications

• Microcontroller system data storage
• Configuration parameter storage
• Calibration data retention

Memory IC Procurement Notes

Verify the specific suffix 'SN' corresponds to the 8-lead SOIC package. Confirm the operating temperature grade matches the required application environment. Ensure the design accounts for the 1.8V to 5.5V supply voltage range and SPI timing requirements. Check for any manufacturer change notifications regarding packaging or sourcing updates.

Memory IC Selection Notes

Select this component for applications requiring low-voltage operation down to 1.8V. Consider the 16-byte page write capability for efficient data programming. Evaluate the need for hardware write protection via the WP pin. Compare against the 25LC040 if a higher minimum voltage is acceptable, or the 25C040 for automotive temperature ranges.

Memory IC Part Context

This part belongs to the 25XX040 family of 4Kbit SPI Serial EEPROMs, which also includes the 25LC040 and 25C040 variants. These devices share similar functional architectures but differ in supply voltage ranges and temperature specifications. The datasheet notes that this specific generation is not recommended for new designs, suggesting consideration of the 25AA040A or 25LC040A alternatives.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 25AA040A-I/SN, 25LC040-I/SN, 25C040-I/SN.