25AA256T-E/SN

Memory IC Overview

The Microchip Technology 25AA256T-E/SN is a 256 Kbit (32K x 8) Serial Electrically Erasable PROM accessed via an SPI-compatible bus. It operates on a supply voltage range of 1.8V to 5.5V with a maximum clock frequency of 10 MHz. The device features a 64-byte page size and self-timed erase/write cycles up to 5 ms. It supports extended temperature operation from -40°C to +125°C and is housed in an 8-lead TSSOP package.

Memory IC Feature Summary

• Supports low-power CMOS technology with standby current as low as 1 µA
• Includes built-in write protection via power-on/off circuitry, write enable latch, and dedicated WP pin
• Features block write protection allowing selective array protection for none, 1/4, 1/2, or all segments
• Provides high reliability with over 1,000,000 erase/write cycle endurance and greater than 200-year data retention

Memory IC Applications

• Microcontroller system memory storage
• Data logging applications requiring non-volatile storage
• Parameter storage in industrial control systems
• Configuration data retention in embedded devices

Memory IC Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature range (-40°C to +125°C) rather than the industrial range. Confirm the 'SN' designation corresponds to the narrow SOIC package dimensions if physical fitment is critical, although the datasheet indicates ST for TSSOP; cross-reference official Microchip documentation for exact package geometry matching.

Memory IC Selection Notes

Select this component when a wide supply voltage range starting at 1.8V is required, distinguishing it from the 2.5V minimum 25LC256 variant. Ensure the application utilizes an SPI interface compatible with Mode 0,0 or Mode 1,1. Consider the TSSOP package availability versus standard SOIC options based on board space constraints.

Memory IC Part Context

This part belongs to the 25XX256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. The family includes variants like the 25LC256 which shares similar functionality but differs in minimum operating voltage. These devices are designed for direct interfacing with popular microcontroller families including PIC microcontrollers.

Memory IC Replacement Considerations

The 25LC256T-E/SN serves as a functional substitute within the same family, provided the system voltage does not drop below 2.5V. Other 256 Kbit SPI EEPROMs from different manufacturers may require firmware adjustments due to potential differences in instruction sets or timing parameters.