25LC020AT-E/ST

Overview

The Microchip Technology 25LC020AT-E/ST is a 2 Kbit (256 x 8) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It operates with a supply voltage range of 2.5 V to 5.5 V and supports a maximum clock frequency of 10 MHz. The device utilizes an SPI-compatible serial bus for communication, featuring sequential read capabilities and write page mode supporting up to 16 bytes. It includes self-timed erase and write cycles with a maximum duration of 5 ms. The component is housed in an 8-lead TSSOP package and is rated for an industrial temperature range of -40°C to +125°C.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz.
• Includes hardware write protection via the WP pin and software block protection settings.
• Features a hold function to pause serial transmission without resetting the sequence.
• Provides high reliability with over one million erase/write cycles and extended data retention.

Applications

• Storing device unique identification numbers and production batch codes
• Saving calibration parameters and user configuration settings
• Recording operational logs and fault history data

Procurement Notes

Verify that the ordering suffix 'T' corresponds to tape-and-reel packaging rather than tube packaging. Confirm the 'E' suffix indicates the automotive temperature grade (-40°C to +125°C), which differs from the standard industrial grade. Ensure the 'ST' suffix matches the required 8-lead TSSOP package type for your specific board layout requirements.

Selection Notes

Select this part when a 2 Kbit non-volatile memory solution is required with robust write protection features. The automotive temperature grade makes it suitable for environments with higher thermal stress compared to standard industrial components. Consider the 10 MHz clock speed if system timing constraints require faster SPI bus throughput than lower-frequency alternatives provide.

Part Context

This component belongs to the 25XX020A family of serial EEPROMs manufactured by Microchip Technology. It shares the same core memory array and instruction set as the 25AA020A, differing primarily in its minimum operating voltage and temperature rating. The family is designed for direct interface with microcontrollers utilizing SPI ports or discrete I/O lines programmed to match the protocol.

Replacement Considerations

The 25LC020A-I/ST serves as the standard industrial temperature grade equivalent within the same package. Cross-reference with other 25LC020A variants such as 25LC020AT-I/MS if different packaging like MSOP is acceptable. Verify that any substitute maintains the 2.5 V to 5.5 V supply voltage range and 10 MHz clock capability.