25AA020AT-I/SN

Memory IC Overview

The Microchip Technology 25AA020AT-I/SN is a 2 Kbit Serial Electrically Erasable Programmable Read-Only Memory (EEPROM) featuring a 256 x 8-bit organization. It operates via a Serial Peripheral Interface (SPI) compatible bus with a maximum clock frequency of 10 MHz. The device supports a supply voltage range of 1.8 V to 5.5 V and functions within an industrial temperature range of -40°C to +85°C. It utilizes an 8-lead SOIC package.

Memory IC Feature Summary

• Supports write page mode for up to 16 bytes and sequential read operations.
• Includes built-in hardware write protection mechanisms such as a write enable latch, power-on/off data protection circuitry, and a dedicated write-protect pin.
• Features a Hold input that allows the host to pause serial communication without resetting the sequence.

Memory IC Applications

• Storing device unique identification numbers and production batch codes.
• Recording operational logs and fault records in embedded systems.
• Saving calibration parameters and user configuration settings.

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature grade (-40°C to +85°C). Confirm the 'SN' designation corresponds to the 8-lead SOIC package type. Ensure the 'T' indicates tape and reel packaging if required by automated assembly processes. Cross-reference the datasheet revision to confirm compatibility with current design specifications.

Memory IC Selection Notes

Select this component when low-voltage operation down to 1.8 V is required, distinguishing it from the 2.5 V minimum 25LC020A variant. Choose the SOIC package for standard surface mount applications requiring wider pitch spacing. Consider the 10 MHz SPI interface speed for high-throughput memory access needs compared to slower I2C alternatives.

Memory IC Part Context

This part belongs to the 25XX020A family of 2 Kbit SPI EEPROMs manufactured by Microchip Technology. It shares identical memory arrays and instruction sets with the 25LC020A, differing primarily in the supported supply voltage range. The family is designed for non-volatile data storage in microcontroller-based systems.

Memory IC Replacement Considerations

The 25LC020AT-I/SN serves as a direct functional substitute, provided the system supply voltage remains at or above 2.5 V. Verify that the application does not require operation below 2.5 V, as the 25LC020A does not support the lower voltage range of the 25AA020A.

Memory IC FAQ

How does the HOLD pin function during SPI communication?

The HOLD pin suspends transmission to the device while in the middle of a serial sequence. Transitions on SI, SCK, and SO are ignored during this state, allowing the host to service higher priority interrupts without retransmitting the sequence.

What happens if a page write crosses a physical page boundary?

If a Page Write command attempts to write across a physical page boundary, the data wraps around to the beginning of the current page, overwriting previously stored data, rather than writing to the next page.