25LC040T/SN

Overview

The Microchip Technology 25LC040T/SN is a 4 Kbit (512 x 8) serial Electrically Erasable PROM. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 2 MHz. The device utilizes an SPI-compatible interface with Chip Select, Serial Clock, Serial Input, and Serial Output pins. It features self-timed write cycles with a maximum duration of 5 ms. The component is housed in an 8-lead Plastic SOIC package and is rated for industrial temperatures from -40°C to +85°C.

Feature Summary

• Low-power CMOS technology with typical standby current of 500 nA
• Hardware write protection via dedicated WP pin and software block protection
• Built-in power-on data protection circuitry and write enable latch
• High reliability with 1 million cycle endurance and over 200 years data retention

Applications

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

Procurement Notes

Verify the specific suffix 'SN' confirms the 8-lead SOIC package and 'T' indicates tape and reel packaging. Confirm the 'I' temperature grade matches the required -40°C to +85°C operating range. Ensure the datasheet version aligns with the requested electrical characteristics. Check for any recent Product Change Notifications regarding manufacturing locations or materials.

Selection Notes

Select this part when a 4 Kbit non-volatile memory solution is required with SPI compatibility. The 2.5V minimum supply voltage makes it suitable for systems operating at 3.3V or 5V. Consider the 16-byte page write capability for efficient data updates. Verify that the 2 MHz clock speed meets the system's communication timing requirements.

Part Context

This component belongs to the 25XX040 family, which includes variants like the 25AA040 and 25C040. These devices share similar functional architectures but differ in supply voltage ranges and maximum clock frequencies. The 25LC040 specifically targets applications requiring a 2.5V to 5.5V operating range.

Replacement Considerations

Datasheet DS21204E explicitly states that the 25AA040/25LC040/25C040 series is not recommended for new designs. The document suggests using the 25AA040A or 25LC040A as modern alternatives.