25AA256-E/SM

Memory IC Overview

The Microchip Technology 25AA256-E/SM is a 256 Kbit Serial Electrically Erasable PROM featuring a 32,768 x 8-bit organization. It utilizes an SPI-compatible serial bus with SCK, SI, SO, and CS signals. The device operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 10 MHz. It includes a 64-byte page buffer and self-timed erase/write cycles with a maximum duration of 5 ms. The component offers block write protection for none, 1/4, 1/2, or all of the array, alongside built-in power-on/off data protection. It is housed in an 8-lead SOIC package and supports extended temperature ranges from -40°C to +125°C.

Memory IC Feature Summary

• Supports high-speed SPI communication with up to 10 MHz clock frequency
• Provides hardware and software write protection mechanisms including WP pin and status register control
• Features low-power CMOS technology with standby current as low as 1 µA
• Includes hold functionality to pause serial transmission without resetting the sequence

Memory IC Applications

• Data logging in industrial monitoring systems
• Configuration storage for microcontroller-based embedded devices
• Parameter retention in automotive electronic control units
• Non-volatile memory backup in consumer electronics

Memory IC Procurement Notes

Verify that the ordering suffix matches the required temperature grade (E for extended) and package type (SM for SOIC). Confirm RoHS compliance status and ensure the specific revision level aligns with design requirements. Check for any recent Product Change Notifications regarding packaging or assembly sites that may affect lead frame material or marking codes.

Memory IC Selection Notes

Select this part when SPI interface compatibility is required with low-voltage operation down to 1.8V. Choose the extended temperature variant (-E) for environments exceeding standard industrial limits. Ensure the application does not require I2C interface, which would necessitate the 24AA256 series instead. Verify that the 64-byte page write limit fits the system's data throughput constraints.

Memory IC Part Context

This component belongs to the 25XX256 family of serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25LC256 but differs in minimum operating voltage specifications. The family is designed for applications requiring reliable non-volatile data storage with simple serial interface protocols.

Memory IC Replacement Considerations

Public confirmed substitute part numbers include 25AA256-I/SM for industrial temperature range and 25LC256-E/SM for 2.5V-5.5V operation only.