25C040-E/P

Memory IC Overview

The Microchip Technology 25C040-E/P is a 4 Kbit (512 x 8) serial Electrically Erasable PROM featuring 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 automotive temperature ranges from -40°C to +125°C and utilizes an 8-pin PDIP package.

Memory IC Feature Summary

• Supports block write protection for none, 1/4, 1/2, or all array segments via STATUS register configuration.
• Includes built-in power on/off data protection circuitry and a dedicated write-protect pin.
• Features self-timed erase and write cycles with automatic address pointer incrementation.

Memory IC Applications

• Automotive electronic systems requiring extended temperature operation
• Microcontroller-based data logging applications
• Industrial control system parameter storage

Memory IC Procurement Notes

Verify the specific 'E' suffix indicates the automotive temperature grade (-40°C to +125°C). Confirm the 'P' suffix corresponds to the 8-lead Plastic DIP package. Ensure voltage requirements match the 4.5V to 5.5V specification before integration.

Memory IC Selection Notes

Select this component when high-temperature reliability is required alongside standard SPI communication. The 25C040 variant specifically targets automotive environments compared to industrial or lower-voltage alternatives. Verify that the 5V logic levels align with the host microcontroller interface.

Memory IC Part Context

This part belongs to the 25XX040 family of 4 Kbit serial EEPROMs. It shares architectural similarities with the 25AA040 and 25LC040 but differs in operating voltage and temperature specifications. The datasheet notes it is not recommended for new designs, suggesting newer A-series variants.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.

Memory IC FAQ

What is the function of the HOLD pin?

The HOLD pin suspends serial communication without resetting the sequence, allowing the host to service higher priority interrupts while keeping the device selected.

How is the write enable latch managed?

The latch must be set via the WREN instruction before writing. It resets automatically after power-up, successful write execution, or if the WP pin goes low.