25C040T/SN

Memory IC Overview

The Microchip Technology 25C040T/SN is a 4 Kbit (512 x 8) serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a VCC range of 4.5V to 5.5V with a maximum clock frequency of 3 MHz. The device supports industrial temperature ranges (-40°C to +85°C) and is housed in an 8-lead Plastic SOIC package. Key electrical characteristics include a typical standby current of 500 nA, write cycle time of 5 ms max, and endurance of 1M cycles.

Memory IC Feature Summary

• Supports sequential read operations and page writes up to 16 bytes.
• Includes hardware write protection via the WP pin and software block protection.
• Features self-timed erase and write cycles with built-in power-on data protection.

Memory IC Applications

• Microcontroller system configuration storage
• Parameter and calibration data retention
• SPI bus peripheral memory expansion

Memory IC Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging and 'SN' denotes the SOIC package. Confirm the voltage range matches the 4.5V to 5.5V requirement for the 25C040 series. Check datasheet revision history for any updates regarding the 'Not recommended for new designs' notice.

Memory IC Selection Notes

Select this component when a 5V-only supply environment requires non-volatile storage with SPI compatibility. Ensure the design accommodates the 4.5V minimum operating voltage. Consider the 16-byte page write limit and the necessity of the WREN instruction before write operations.

Memory IC Part Context

This part belongs to the 25XX040 family, which also includes the 25AA040 (1.8V-5.5V) and 25LC040 (2.5V-5.5V). The 25C040 variant is specifically optimized for 5V operation. The 'T' suffix distinguishes it from tube-packaged versions by providing tape and reel packaging suitable for automated assembly.

Memory IC Replacement Considerations

Datasheet notes indicate this device is not recommended for new designs; consider the 25AA040A or 25LC040A as alternatives. Verify pinout compatibility if substituting with other 8-pin EEPROMs.