24AA04H-I/MS

Memory IC Overview

The Microchip Technology 24AA04H-I/MS is a 4-Kbit (512 x 8) serial EEPROM featuring an I²C-compatible two-wire 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 page writes of up to 16 bytes with a maximum write cycle time of 5 ms. It includes hardware write protection for the upper half of the memory array (addresses 100h-1FFh) via the WP pin. Operating temperature range is -40°C to +85°C. Standby current is typically 1 µA.

Memory IC Feature Summary

• Supports bidirectional two-wire serial communication compatible with standard I²C protocols.
• Includes hardware write-protect functionality that inhibits write operations to the upper half of the memory array when the WP pin is tied high.
• Features Schmitt trigger inputs and noise suppression filters on SDA and SCL lines to ensure reliable data transmission in noisy environments.
• Utilizes low-power CMOS technology allowing for minimal active and standby current consumption during operation.

Memory IC Applications

• Data logging applications requiring non-volatile storage of sensor readings or system parameters.
• Configuration storage for microcontroller-based systems where user settings must be retained after power loss.
• Calibration data retention for industrial instrumentation and measurement devices.
• Identification and tracking information storage in embedded consumer electronics.

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature range (-40°C to +85°C) and 'MS' denotes the 8-Lead MSOP package. Confirm the device variant matches the 24AA04H series specifications, particularly the 1.7V minimum operating voltage, distinct from the 2.5V minimum of the 24LC04BH. Ensure compatibility with the host controller's I²C voltage levels and pull-up resistor requirements for the selected bus speed.

Memory IC Selection Notes

Select this component when a 4-Kbit capacity is sufficient and operation below 2.5V is required, as it supports voltages down to 1.7V unlike the 24LC04BH. Choose the 24AA04H over the 24FC04H if a maximum clock frequency of 400 kHz is adequate, as the 24FC04H offers 1 MHz support. Consider the hardware write-protect feature if protecting specific memory regions is necessary without software overhead. Verify package availability in MSOP format for space-constrained designs.

Memory IC Part Context

The 24AA04H is part of the 24XX04H family of 4-Kbit serial EEPROMs manufactured by Microchip Technology. This family shares common architectural features but differs in electrical characteristics such as minimum operating voltage and maximum clock frequency. The 24AA04H specifically targets applications requiring lower voltage operation compared to the 24LC04BH, while offering standard I²C speeds suitable for general-purpose embedded systems.

Memory IC Replacement Considerations

The 24LC04BH serves as a functional substitute if the application voltage remains above 2.5V, though it lacks the 1.7V capability. The 24FC04H can replace this device if higher bus speeds up to 1 MHz are needed, provided the voltage and temperature ranges align. Direct pin-for-pin replacement is possible within the same package type, but verify voltage tolerance and clock speed limitations of the host system.