25AA256-I/P

Memory IC Overview

The Microchip Technology 25AA256-I/P is a 256 Kbit (32,768 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible serial bus. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz at higher voltages. The device features self-timed erase and write cycles with a maximum duration of 5 ms. It includes block write protection capabilities and built-in power-on/off data protection circuitry. The component is housed in an 8-lead PDIP package and is rated for industrial temperature operation from -40°C to +85°C.

Memory IC Feature Summary

• Supports high-speed SPI communication with clock frequencies reaching 10 MHz.
• Includes hardware write protection via the WP pin and software control through the STATUS register.
• Features a HOLD input to pause serial communication without resetting the sequence.
• Provides non-volatile storage with over 200 years of data retention.

Memory IC Applications

• Data logging in industrial monitoring systems
• Configuration storage for microcontroller-based devices
• Parameter storage in embedded sensor networks

Memory IC Procurement Notes

Verify that the specific part number suffix matches the required voltage range and temperature grade. Confirm the package type corresponds to the design requirements. Ensure compliance with RoHS directives if applicable. Check for automotive AEC-Q100 qualification if the application demands it. Validate the manufacturer source against official Microchip documentation.

Memory IC Selection Notes

Select this component when an SPI interface is preferred over I2C for memory access. Choose the 25AA256 variant specifically for applications requiring operation down to 1.8V, as opposed to the 2.5V minimum of the 25LC256 series. Consider the PDIP package only for through-hole mounting designs. Evaluate the need for page write capabilities and block protection levels before finalizing the selection.

Memory IC Part Context

This device belongs to the 25XX256 family of serial EEPROMs from Microchip Technology. It shares functional similarities with the 25LC256 but differs in its lower operating voltage range. The family is designed for general-purpose non-volatile memory applications requiring reliable data retention and high endurance.

Memory IC Replacement Considerations

The 25LC256-I/P is a compatible alternative within the same family, though it requires a minimum supply voltage of 2.5V rather than 1.8V. Other packages such as SOIC or TSSOP may be used if form factor changes are acceptable.