25AA040/P

Memory IC Overview

The Microchip Technology 25AA040/P is a 4 Kbit (512 x 8-bit) serial Electrically Erasable PROM. It operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 1 MHz. The device utilizes an SPI-compatible interface with SCK, SI, SO, CS, HOLD, and WP pins. It features a 16-byte page write capability, self-timed erase/write cycles of up to 5 ms, and block write protection. Endurance is rated at 1 million cycles with data retention exceeding 200 years. The component is housed in an 8-lead Plastic Dual In-line Package (PDIP) and supports an industrial temperature range from -40°C to +85°C.

Memory IC Feature Summary

• Low-power CMOS technology with typical standby current of 500 nA
• Hardware write-protect pin for array security
• Built-in power on/off data protection circuitry
• HOLD pin functionality to pause serial communication

Memory IC Applications

• Microcontroller system parameter storage
• Device configuration data logging
• Calibration value retention
• Small-scale non-volatile data archiving

Memory IC Procurement Notes

Verify the specific suffix 'P' corresponds to the 8-lead PDIP package when sourcing. Confirm the 'I' designation indicates the Industrial temperature range (-40°C to +85°C). Ensure compatibility with existing PCB footprints designed for through-hole DIP components. Check datasheet revisions as this part is marked not recommended for new designs.

Memory IC Selection Notes

Select this component for applications requiring low-voltage operation starting at 1.8V. Consider alternatives like the 25LC040 if the minimum operating voltage requirement is 2.5V or higher. Evaluate the 25C040 if extended automotive temperature ranges are necessary. Verify that the 1 MHz clock speed meets system timing requirements.

Memory IC Part Context

This device belongs to the 25XX040 family of serial EEPROMs from Microchip Technology. It shares architectural similarities with the 25LC040 and 25C040, differing primarily in supply voltage ranges and temperature specifications. The 25AA040 variant specifically targets broader voltage compatibility including lower voltage systems.

Memory IC Replacement Considerations

Public confirmed substitute part numbers include 25AA040-I/MS, 25AA040-I/SN, and 25AA040-I/ST.