25AA020AT-I/ST

Memory IC Overview

The Microchip Technology 25AA020AT-I/ST is a 2 Kbit (256 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). 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 low-power CMOS technology with standby current as low as 5 µA at 5.5V. It includes hardware write protection, self-timed erase/write cycles up to 5 ms, and block write protection for none, 1/4, 1/2, or all of the array. Endurance is rated for 1,000,000 erase/write cycles with data retention exceeding 200 years.

Memory IC Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz.
• Includes built-in hardware write protection via the WP pin and software-controlled block protection.
• Features a hold function to pause serial transmission without resetting the sequence.

Memory IC Applications

• Data storage in microcontroller systems requiring non-volatile memory
• Configuration parameter storage in industrial control devices
• Calibration data retention in sensor interfaces

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and 'ST' indicates the SOIC-8 package. Confirm the 'T' suffix denotes tape-and-reel packaging if required by assembly equipment. Ensure the specific revision matches the datasheet DS21833G for accurate electrical characteristics.

Memory IC Selection Notes

Select this component when a wide 1.8V to 5.5V operating voltage range is necessary, unlike the 2.5V minimum requirement of the 25LC020A variant. Choose the SOIC-8 package for standard surface-mount applications. Consider the 10 MHz clock speed for high-throughput SPI interfaces and verify that the 16-byte page write size aligns with application data structures.

Memory IC Part Context

This part belongs to the 25XX020A family of 2 Kbit SPI EEPROMs from Microchip Technology. It shares functional similarities with the 25LC020A but differs primarily in its lower minimum operating voltage of 1.8V compared to 2.5V. The family offers various package options including PDIP, MSOP, TSSOP, and DFN variants.

Memory IC Replacement Considerations

The 25LC020AT-I/ST is a direct functional substitute with identical pinout and instructions, though it requires a minimum supply voltage of 2.5V instead of 1.8V. Other 25AA020A variants with different packages (e.g., MSOP, TSSOP) are compatible if form factor changes are acceptable.