25LC256-E/ST

Overview

The Microchip Technology 25LC256-E/ST is a 256 Kbit (32,768 x 8-bit) Serial Electrically Erasable PROM. It operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 10 MHz via an SPI-compatible serial bus. The device features a 64-byte page size and self-timed erase/write cycles with a maximum duration of 5 ms. It is housed in an 8-lead TSSOP package and supports an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Supports block write protection for none, 1/4, 1/2, or all of the memory array
• Includes built-in power-on/off data protection circuitry and a write enable latch
• Features a hold pin to pause serial communication without resetting the sequence
• Provides high reliability with over 1,000,000 erase/write cycles and greater than 200 years data retention

Applications

• Microcontroller systems requiring non-volatile storage for calibration parameters
• Industrial sensor nodes storing device identification data
• Low-cost embedded systems needing reliable configuration storage

Procurement Notes

Verify that the ordering suffix 'ST' corresponds to the 8-lead TSSOP package type. Confirm the 'E' suffix indicates the extended temperature range (-40°C to +125°C). Ensure the specific revision of the datasheet DS20001822H matches the component batch requirements. Check RoHS compliance status as indicated in the manufacturer documentation.

Selection Notes

Select this component when an SPI interface is required for EEPROM storage. The 25LC256-E/ST is suitable for applications demanding extended temperature operation up to +125°C. Consider the 64-byte page write capability for efficient data management. Verify that the system voltage falls within the 1.8V to 5.5V operating range.

Part Context

This part belongs to the 25XX256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA256 but differs in minimum operating voltage. The device is designed for direct interfacing with microcontrollers supporting standard SPI protocols.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.