25C040-I/SN

Memory IC Overview

The Microchip Technology 25C040-I/SN is a 4 Kbit (512 x 8) serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a supply voltage range of 4.5V to 5.5V and supports a maximum clock frequency of 3 MHz. The device is housed in an 8-lead Plastic Small Outline (SOIC) package with a narrow 150 mil body. It is rated for industrial temperature applications, functioning reliably between -40°C and +85°C.

Memory IC Feature Summary

• Supports hardware write protection via the WP pin and software block protection through the STATUS register.
• Includes power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Features a HOLD input that allows suspension of serial communication without resetting the sequence.

Memory IC Applications

• Microcontroller system configuration storage
• Calibration data retention
• Parameter logging

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature range (-40°C to +85°C) and 'SN' denotes the 8-lead SOIC package. Confirm the device meets required voltage specifications as this model is restricted to the 4.5V to 5.5V range. Check datasheet revision history for any manufacturing changes or updates relevant to the production batch.

Memory IC Selection Notes

Select this component when a 5V-only supply environment is present and high-speed 3 MHz SPI communication is required. Ensure the application does not need lower voltage operation, as variants like the 25LC040 support 2.5V minimums. Verify that the 8-pin SOIC footprint aligns with the PCB layout constraints.

Memory IC Part Context

This part belongs to the 25XX040 family, which also includes the 25AA040 and 25LC040. While sharing similar architecture, the 25C040 is distinguished by its higher operating voltage range and automotive-grade temperature option (suffix E). The 'I' suffix specifically designates the industrial grade variant.

Memory IC Replacement Considerations

Direct substitutes include other 25C040 variants with different packages, such as 25C040-I/P (PDIP) or 25C040-I/ST (TSSOP). For lower voltage applications, the 25LC040 series may be considered if electrical parameters allow.