25LC020AT-E/OT

Overview

The Microchip Technology 25LC020AT-E/OT is a 2 Kbit (256 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It utilizes a standard SPI-compatible serial bus for communication, supporting a maximum clock frequency of 10 MHz. The device operates within a supply voltage range of 2.5 V to 5.5 V and supports an extended temperature range from -40°C to +125°C. It features low-power CMOS technology with standby current as low as 1 µA. The memory includes self-timed erase and write cycles with a maximum duration of 5 ms.

Feature Summary

• Supports sequential read operations and page write mode allowing up to 16 bytes per cycle.
• Includes built-in hardware write protection via the WP pin and software block protection for none, 1/4, 1/2, or all of the array.
• Features power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Provides a HOLD input to pause serial communication without resetting the sequence.

Applications

• Storing device unique IDs and production batch numbers
• Saving calibration parameters and user settings
• Recording simple operational logs or fault records

Procurement Notes

Verify that the ordering suffix 'E' confirms the automotive temperature grade (-40°C to +125°C) and 'OT' specifies the 6-lead SOT-23 package. Confirm the 'T' indicates tape and reel packaging. Ensure the specific part number matches the required voltage range of 2.5V to 5.5V, as industrial variants may differ in minimum voltage specifications.

Selection Notes

Select this component when an SPI interface is preferred over I²C for robustness against interference in noisy environments. Choose the 25LC020AT-E/OT specifically for applications requiring operation at temperatures up to +125°C. Verify that the system voltage remains above 2.5 V to ensure proper functionality, as lower voltages are not supported by this specific model variant.

Part Context

This EEPROM belongs to the 25XX020A family, which shares identical core memory arrays and instruction sets. The 25LC020A series is distinguished from the 25AA020A series primarily by its minimum operating voltage requirement of 2.5 V compared to 1.8 V. The device is designed for direct interfacing with microcontrollers possessing SPI ports or via discrete I/O lines.

Replacement Considerations

Public confirmed substitute part numbers: 25LC020AT-I/OT, 25LC020A-E/P, 25LC020A-E/SN.