24AA04HT-I/OT

Memory IC Overview

The Microchip Technology 24AA04HT-I/OT is a 4-Kbit (512 x 8) Electrically Erasable PROM (EEPROM) featuring a two-wire I2C compatible serial interface. It operates on a single supply voltage ranging from 1.7V to 5.5V with a maximum clock frequency of 400 kHz at VCC ≥ 2.5V, and 100 kHz at VCC < 2.5V. The device supports industrial temperature ranges (-40°C to +85°C) and includes hardware write-protect functionality for the upper half of the memory array (addresses 100h-1FFh). It utilizes low-power CMOS technology with standby current of 1 µA maximum and active read current of 1 mA maximum.

Memory IC Feature Summary

• Hardware write-protect capability for the upper half of the memory array via the WP pin
• Low-voltage operation down to 1.7V with low standby and active power consumption
• I2C compatible two-wire serial interface with Schmitt trigger inputs for noise suppression
• Page write buffer supporting up to 16 bytes per write cycle

Memory IC Applications

• Data logging in battery-powered devices requiring low standby current
• Configuration storage in consumer electronics with limited voltage headroom
• Parameter retention in industrial control systems operating across wide temperature ranges
• Smart card applications utilizing the half-array write-protect feature

Memory IC Procurement Notes

Verify the specific suffix 'OT' corresponds to the 5-Lead SOT-23 package as documented in the official datasheet. Confirm that the 'I' designation matches the required Industrial temperature range (-40°C to +85°C). Ensure the design accommodates the 1.7V minimum supply voltage and 400 kHz maximum clock speed constraints defined for this device variant.

Memory IC Selection Notes

Select this component when a compact 5-lead SOT-23 footprint is required for 4-Kbit non-volatile storage. It is suitable for designs needing hardware write protection for critical data segments without software overhead. Consider the 100 kHz clock limit if the system operates below 2.5V. Compare against the 24LC04BH if a higher 2.5V minimum voltage threshold is acceptable for potentially different availability or pricing structures.

Memory IC Part Context

This part belongs to the 24XX04H family of I2C Serial EEPROMs, which also includes the 24LC04BH and 24FC04H variants. While sharing the same core memory architecture and interface protocol, these families differ in minimum operating voltage and maximum clock frequency specifications. The 24AA04H series specifically targets low-voltage applications compared to the 2.5V minimum requirement of the 24LC04BH.

Memory IC Replacement Considerations

Direct substitutes within the same package include other 24AA04H variants with different suffixes indicating package type (e.g., SN for SOIC, ST for TSSOP) but identical electrical characteristics. Cross-family replacements like the 24LC04BH require verification of voltage level compatibility.