24AA04H-I/ST

Memory IC Overview

The Microchip Technology 24AA04H-I/ST is a 4-Kbit (512 x 8) Electrically Erasable PROM (EEPROM) featuring a two-wire I2C 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 includes hardware write-protect functionality for the upper half-array (addresses 100h-1FFh). It supports page writes up to 16 bytes with a maximum cycle time of 5 ms. Operating temperature range is -40°C to +85°C (Industrial), housed in an 8-Lead TSSOP package.

Memory IC Feature Summary

• Hardware write-protect capability for the upper half of the memory array via the WP pin
• Low-power CMOS technology with standby current as low as 1 µA
• Schmitt trigger inputs and output slope control for noise suppression and ground bounce elimination
• Self-timed erase/write cycles with acknowledge polling support

Memory IC Applications

• Data logging applications requiring non-volatile storage
• Configuration storage in industrial control systems
• Parameter retention in battery-backed embedded systems
• Smart card and security token memory arrays

Memory IC Procurement Notes

Verify the specific suffix 'I/ST' corresponds to Industrial temperature grade (-40°C to +85°C) and TSSOP packaging. Confirm that the 'H' variant designation aligns with the 1.7V minimum operating voltage requirement rather than the 2.5V threshold found in other family members. Ensure the application design accounts for the half-array write protection logic if full memory access is required.

Memory IC Selection Notes

Select this component when a 4-Kbit capacity is sufficient and low-voltage operation down to 1.7V is necessary. The 24AA04H differs from the 24LC04BH which requires a minimum of 2.5V. Consider the 24FC04H if higher speed (1 MHz) is needed. The TSSOP package is suitable for surface-mount assembly. Verify that the I2C bus pull-up resistors are correctly sized for the selected clock frequency and supply voltage.

Memory IC Part Context

This part belongs to the 24XX04H family of I2C Serial EEPROMs, which also includes the 24LC04BH and 24FC04H variants. These devices share similar architectural features but differ in minimum operating voltage and maximum clock frequency specifications. The 24AA04H specifically targets applications requiring operation below 2.5V while maintaining standard I2C compatibility.

Memory IC Replacement Considerations

Direct substitutes include other packages within the same electrical specification such as 24AA04H-I/SN (SOIC) or 24AA04H-I/MC (DFN). Cross-family replacements like 24LC04H require verification of the 2.5V minimum voltage constraint.