25LC020A-I/ST

Overview

The Microchip Technology 25LC020A-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 2.5 V to 5.5 V and supports a maximum clock frequency of 10 MHz at voltages between 4.5 V and 5.5 V. The device utilizes an SPI-compatible serial bus for data access, featuring a 16-byte page write mode and self-timed erase/write cycles with a maximum duration of 5 ms. It includes built-in hardware write protection via the WP pin and software-controlled block protection.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz
• Includes hardware write protection via the dedicated WP pin and software-configurable block protection
• Features low-power CMOS technology with standby current as low as 1 µA
• Provides high reliability with 1,000,000 erase/write cycle endurance and over 200 years of data retention

Applications

• Storage of device unique identification numbers and production batch codes
• Persistence of calibration parameters and user configuration settings
• Logging of operational status or fault records in embedded systems

Procurement Notes

Verify that the ordering suffix matches the required package type, specifically TSSOP-8 for the ST variant. Confirm the temperature grade corresponds to Industrial (-40°C to +85°C) rather than Automotive (-40°C to +125°C). Ensure the voltage range requirement aligns with the 2.5 V minimum specification of the LC series, distinct from the AA series which supports lower voltages.

Selection Notes

Select this component when a 2 Kbit non-volatile memory solution is required with SPI interface compatibility. The Industrial temperature rating suits general-purpose applications operating between -40°C and +85°C. Consider the 16-byte page size limitation for write operations, ensuring application logic handles page boundary wrapping correctly to prevent data overwrite errors.

Part Context

This part belongs to the Microchip 25XX020A family of 2 Kbit SPI EEPROMs. The 'LC' designation indicates a 2.5 V to 5.5 V operating voltage range, distinguishing it from the 'AA' variant which supports 1.8 V operation. The 'I' suffix denotes the Industrial temperature grade, while 'ST' specifies the 8-lead Thin Shrink Small Outline Package (TSSOP).

Replacement Considerations

The 25LC020A-I/P serves as a direct functional substitute using a PDIP-8 package. For automotive-grade requirements, the 25LC020A-E variants are available. Cross-series replacements like the 25LC040A offer larger capacity but share identical instruction sets and pinouts.