25AA040T-I/SN

Memory IC Overview

The Microchip Technology 25AA040T-I/SN is a 4 Kbit (512 x 8) serial Electrically Erasable PROM. It operates within a 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 a typical standby current of 500 nA. It features a 16-byte page write capability, self-timed erase/write cycles, and block write protection. The component is housed in an 8-lead SOIC package and supports an industrial temperature range from -40°C to +85°C.

Memory IC Feature Summary

• Low-power CMOS technology with minimal active and standby currents
• Hardware write protection via dedicated pin and software-controlled block protection
• Self-timed internal write cycle management

Memory IC Applications

• Microcontroller data storage for configuration parameters
• Non-volatile memory for system calibration values
• Data logging applications requiring infrequent writes

Memory IC Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging rather than tube. Confirm the 'I' designation matches the required industrial temperature range. Ensure the 'SN' package code corresponds to the narrow SOIC footprint on the target PCB layout. Cross-reference the datasheet revision to confirm compatibility with existing firmware drivers.

Memory IC Selection Notes

Select this part when a low-voltage operation starting at 1.8V is required. The 1 MHz clock speed suits applications where high throughput is not critical. Consider the 16-byte page size for write efficiency. Verify that the SPI mode polarity and phase align with the host controller's settings before finalizing the design.

Memory IC Part Context

This component belongs to the 25XX040 family of serial EEPROMs. It shares architectural similarities with the 25LC040 and 25C040 but differs in operating voltage and clock speed specifications. The 'T' suffix specifically denotes the tape and reel packaging format intended for automated surface-mount assembly processes.

Memory IC Replacement Considerations

Datasheet notes indicate this device is not recommended for new designs; the 25AA040A or 25LC040A are suggested alternatives.