25LC256T-E/ST16KVAO

Overview

The Microchip Technology 25LC256T-E/ST16KVAO is a 256 Kbit (32,768 x 8-bit) Serial Electrically Erasable PROM. It utilizes an SPI-compatible serial bus for data access and operates within a voltage range of 2.5 V to 5.5 V. The device supports a maximum clock frequency of 10 MHz at 5.5 V and features a 64-byte page size with self-timed write cycles up to 5 ms. It is housed in an 8-lead TSSOP package and qualified for extended industrial temperature ranges from -40°C to +125°C.

Feature Summary

• Supports block-level write protection allowing configuration to protect none, one-quarter, one-half, or the entire memory array via status register bits.
• Includes built-in hardware write protection controlled by the WP pin and WPEN bit to prevent inadvertent writes to nonvolatile status register bits.
• Features power-on/off data protection circuitry that resets the write enable latch upon power-up to ensure safe operation.

Applications

• Microcontroller systems requiring non-volatile storage for configuration parameters
• Industrial control devices needing high reliability and extended temperature operation
• Automotive electronics applications requiring AEC-Q100 qualification

Procurement Notes

Verify the specific suffix '16KVAO' against official Microchip documentation to confirm if it denotes a unique variant or standard packaging designation. Ensure the selected temperature grade matches the application's environmental requirements. Confirm RoHS compliance status through the manufacturer's current datasheet revision.

Selection Notes

Select this component when an SPI interface is required for low-pin-count EEPROM applications. The extended temperature range (-40°C to +125°C) makes it suitable for harsh environments. Consider the 64-byte page write capability for efficient data handling. Ensure the system voltage remains within the 2.5 V to 5.5 V operating range.

Part Context

This part belongs to the 25LC256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. The family includes variants with different voltage ranges and temperature grades, such as the 25AA256 which supports lower voltages down to 1.8 V. All members share the same SPI protocol and functional architecture.

Replacement Considerations

Direct replacements include other 25LC256 variants with compatible packages like SOIC-8 or PDIP-8. Verify that substitute parts support the required 10 MHz clock speed and extended temperature range. Cross-reference pinouts to ensure compatibility with existing PCB layouts.