25LC256-E/SM16KVAO

Overview

The Microchip Technology 25LC256-E/SM16KVAO is a 256 Kbit Serial Electrically Erasable PROM featuring a 32,768 x 8-bit organization. It operates via an SPI-compatible serial bus with a maximum clock frequency of 10 MHz and supports a supply voltage range of 2.5 V to 5.5 V. The device utilizes low-power CMOS technology, offering standby current as low as 1 µA. It provides high reliability with 1,000,000 erase/write cycles and data retention exceeding 200 years. The component is housed in an 8-lead SOIC package and supports extended temperature ranges from -40°C to +125°C.

Feature Summary

• Supports block write protection allowing selective array segments to be protected against writes
• Includes built-in power-on/off data protection circuitry and a write enable latch
• Features a hold pin that allows pausing serial communication without resetting the sequence
• Provides hardware write protection through a dedicated write-protect pin

Applications

• Microcontroller system data storage
• Configuration parameter storage
• Calibration value retention
• Device identification information storage

Procurement Notes

Verify the specific suffix '16KVAO' against official Microchip documentation to confirm its exact meaning regarding packaging or marking variations. Ensure the Extended temperature grade (E) matches the operational requirements. Confirm RoHS compliance status for the specific manufacturing batch. Validate that the SOIC package dimensions align with the target PCB footprint specifications.

Selection Notes

Select this component when an SPI interface is required for non-volatile memory applications. The 25LC256 series is suitable for systems needing moderate capacity with robust write endurance. Consider the extended temperature range if operating in harsh environments. Verify that the 64-byte page size constraints fit the application's write patterns to avoid page boundary wrap-around issues.

Part Context

This part belongs to the 25LC256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. The family includes variants with different temperature grades and package types such as PDIP, TSSOP, and DFN. The 'E' designation indicates the extended industrial temperature range capability. These devices are designed for general-purpose data storage in embedded systems requiring reliable non-volatile memory access.

Replacement Considerations

Compatible substitutes include other 25LC256 variants from Microchip with matching electrical characteristics. Cross-referencing with similar SPI EEPROMs requires verifying voltage compatibility and pinout alignment.