ADT7475ARQZ-RL7

Overview

The ADT7475ARQZ-RL7 is a remote thermal monitor and fan controller manufactured by onsemi. It operates within a supply voltage range of 3.0 V to 3.6 V with a typical current consumption of 1.5 mA. The device features one local sensor and two remote diode sensors, providing temperature accuracy of ±0.5°C between 0°C and 85°C. It supports SMBus communication at frequencies up to 400 kHz and includes three PWM outputs for controlling up to four fans. The component is housed in a 16-lead QSOP package.

Feature Summary

• Controls and monitors up to four fans using high or low frequency drive signals
• Monitors temperatures via one on-chip sensor and two remote diode sensors
• Provides automatic fan speed control based on measured temperature data
• Includes enhanced acoustic mode to reduce user perception of changing fan speeds

Applications

• Noise-sensitive computer systems requiring active cooling
• Power-sensitive applications needing optimized thermal management
• Monitoring Intel Pentium 4 processor performance impact
• Systems utilizing bidirectional THERM pin for overtemperature protection

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to reel packaging requirements. Confirm that the 16-lead QSOP package dimensions match the target PCB footprint. Ensure the system power supply does not exceed the absolute maximum rating of 3.6 V to prevent irreversible damage. Check for RoHS compliance documentation if required for environmental regulations.

Selection Notes

Select this component when multiple fan control and remote temperature monitoring are required in a single IC. Consider the fixed SMBus address and open-drain output requirements for bus compatibility. Evaluate the need for extended temperature measurement ranges up to 191°C if operating in extreme environments. Verify that the system can accommodate the necessary pull-up resistors for SMBus and PWM lines.

Part Context

This part belongs to the ADT7475 series of thermal monitors and fan controllers. It is designed for systems requiring active cooling solutions. The device integrates analog-to-digital conversion and serial bus interfaces. It serves as a centralized controller for thermal management in computing hardware.

Replacement Considerations

Public confirmed substitute part numbers: None identified.