24LC32AF-E/ST

Memory IC Overview

The Microchip Technology 24LC32AF-E/ST is a 32-Kbit Electrically Erasable PROM (EEPROM) organized as one block of 4K x 8-bit memory. It features a two-wire serial interface compatible with I²C protocols, supporting clock frequencies up to 400 kHz for VCC ≥ 2.5V. The device operates within a supply voltage range of 2.5V to 5.5V and supports an extended temperature range from -40°C to +125°C. Key electrical characteristics include a maximum read current of 400 µA and a standby current of 5 µA at 5.5V in the extended temperature range. It offers high reliability with over one million erase/write cycles and data retention exceeding 200 years.

Memory IC Feature Summary

• Hardware write-protect capability for the upper quarter of the array via the WP pin
• Supports page write operations with a 32-byte on-chip buffer
• Schmitt trigger inputs provide noise suppression on SDA and SCL lines
• Output slope control eliminates ground bounce during switching

Memory IC Applications

• Data logging in industrial environments requiring extended temperature stability
• Configuration storage for microcontroller-based systems
• Parameter retention in battery-backed or low-power embedded devices
• Device identification and calibration data storage in consumer electronics

Memory IC Procurement Notes

Verify that the specific ordering suffix corresponds to the Extended temperature grade (-40°C to +125°C) and the TSSOP package type. Confirm RoHS compliance status and ensure the supply voltage requirements align with the system's 2.5V minimum threshold. Check for any recent Product Change Notifications regarding assembly sites or packaging materials.

Memory IC Selection Notes

Select this component when an I²C-compatible EEPROM with extended temperature operation is required. Ensure the design accommodates the 2.5V minimum supply voltage, as lower voltages restrict clock speed. Consider the 32-byte page write buffer size for write efficiency. Verify that the physical footprint matches the 8-Lead TSSOP dimensions and that the application utilizes the hardware write-protect feature if security for the upper memory array is needed.

Memory IC Part Context

This part belongs to the 24XX32AF family of 32-Kbit serial EEPROMs. The 'LC' designation indicates a 2.5V minimum operating voltage, distinguishing it from the 'AA' variant which supports 1.7V. The 'E' suffix denotes the extended industrial temperature range, while 'ST' specifies the 8-Lead TSSOP package. This family shares functional compatibility with other 24LC32 variants but differs in voltage and thermal specifications.

Memory IC Replacement Considerations

Direct substitutes include other 24LC32AF variants with different packages such as 24LC32AF-E/MS (MSOP) or 24LC32AF-E/P (PDIP), provided the board layout supports the alternative footprint. Cross-family replacements like the 24AA32AF-E/ST are functionally similar but require verification of the 1.7V vs 2.5V supply constraints.