24AA32AFT-I/OT

Memory IC Overview

The Microchip Technology 24AA32AFT-I/OT is a 32 Kbit (4K x 8-bit) serial EEPROM featuring an I²C-compatible 2-wire interface. It operates on a single supply voltage ranging from 1.7V to 5.5V, supporting clock frequencies up to 400 kHz at VCC ≥ 2.5V and 100 kHz at lower voltages. The device includes a 32-byte page write buffer and hardware write-protect capability for the upper quarter of the array via the WP pin. It functions within an industrial temperature range of -40°C to +85°C and is housed in an 8-lead TSSOP package.

Memory IC Feature Summary

• Supports bidirectional data transfer via a standard 2-wire serial bus with Schmitt trigger inputs for noise suppression.
• Includes a 32-byte page write buffer to optimize write throughput and reduce internal programming cycles.
• Provides hardware write protection for the upper 1/4 of the memory array when the WP pin is tied high.
• Allows cascading of up to eight devices on the same bus using three dedicated chip address pins.

Memory IC Applications

• Personal communications equipment requiring low-power non-volatile storage
• Data acquisition systems needing reliable parameter retention
• Industrial control modules utilizing I²C communication protocols

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature grade (-40°C to +85°C) and 'T' indicates tape-and-reel packaging. Confirm the 'OT' suffix aligns with the specific 8-lead TSSOP package variant required for your PCB footprint. Ensure the design supports the 1.7V minimum operating voltage if powering from low-voltage rails, as this distinguishes it from the 2.5V minimum 24LC32AF variant.

Memory IC Selection Notes

Select this component when a low-voltage operation down to 1.7V is required, distinguishing it from the 24LC32AF which requires a minimum of 2.5V. The Industrial temperature rating suits general commercial and industrial environments but excludes automotive applications requiring the E-grade variant. The TSSOP package is appropriate for space-constrained surface-mount designs. Verify that the application does not require the five-lead SOT-23 form factor, which lacks address pins.

Memory IC Part Context

This part belongs to the 24XX32AF family of 32 Kbit serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 24LC32AF but differs in its lower voltage operational threshold. The family utilizes a standardized I²C protocol, ensuring compatibility with various microcontrollers and system-on-chip solutions that support two-wire serial interfaces.

Memory IC Replacement Considerations

The 24LC32AF serves as a functional substitute if the system voltage remains above 2.5V, though it lacks 1.7V operation. Other 24AA32AF variants with different packages (e.g., SOIC, PDIP) or temperatures (E-grade) may replace this unit if physical or thermal constraints allow. Cross-model substitution requires verifying voltage tolerances and package dimensions.