25AA256T-I/SM

Memory IC Overview

The Microchip Technology 25AA256T-I/SM is a 256 Kbit (32,768 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible bus. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz. The device features a 64-byte page size with self-timed erase/write cycles completing in 5 ms maximum. It utilizes low-power CMOS technology, offering standby current as low as 1 µA. The component is housed in an 8-lead TSSOP package and is rated for industrial temperature operation from -40°C to +85°C.

Memory IC Feature Summary

• Supports block write protection allowing selective array segments to be protected against modification.
• Includes built-in power-on/off data protection circuitry to prevent inadvertent writes during power transitions.
• Features a hold pin that suspends serial communication without resetting the sequence or requiring retransmission.

Memory IC Applications

• Data logging systems requiring non-volatile storage for sensor readings.
• Configuration memory for microcontroller-based embedded devices.
• Parameter storage in industrial control equipment.

Memory IC Procurement Notes

Verify the specific suffix 'I/SM' corresponds to the Industrial temperature range (-40°C to +85°C) and the 8-lead TSSOP package type. Confirm RoHS compliance status and ensure the ordering quantity matches the required reel specifications for surface mount assembly processes.

Memory IC Selection Notes

Select this part when a wide 1.8V to 5.5V operating voltage range is required compared to lower-voltage-only alternatives. Ensure the application can accommodate the 64-byte page write limitation where data crossing page boundaries wraps around. Verify that the SPI interface timing requirements align with the master controller's capabilities.

Memory IC Part Context

This component belongs to the 25XX256 family of 256 Kbit SPI Serial EEPROMs manufactured by Microchip Technology. It shares functional compatibility with the 25LC256 variant, differing primarily in the minimum operating voltage specification. The family provides high reliability with over one million erase/write cycles and extended data retention capabilities.

Memory IC Replacement Considerations

The 25AA256T-I/SN serves as a direct physical replacement if the SOIC-8 package is acceptable instead of TSSOP-8. For applications strictly requiring the TSSOP-8 footprint, verify availability of other 25AA256 variants with the ST suffix.