ADT7476AARQZ-R

Thermal Management Overview

The ADT7476AARQZ-R is a thermal monitor and multiple PWM fan controller designed for noise-sensitive or power-sensitive applications requiring active system cooling. It operates on a 3.0 V to 3.6 V supply voltage with a typical current of 3.0 mA. The device features one internal and two remote temperature sensors with ±0.5°C accuracy at 25°C, supporting an extended measurement range up to 191°C. It monitors up to four fans via TACH inputs and controls them using three PWM outputs (PWM1–PWM3) plus one high-frequency drive signal. The component communicates via an SMBus interface compliant with SMBus 2.0 specifications.

Thermal Management Feature Summary

• Monitors up to five voltages including processor core, chipset, and power rails.
• Controls and monitors up to four fans with automatic speed control based on measured temperature.
• Provides enhanced acoustic mode to reduce user perception of changing fan speeds.
• Features bidirectional THERM pin for critical thermal protection and system overheating prevention.

Thermal Management Applications

• Noise-sensitive server systems
• Power-sensitive computing platforms
• Intel Pentium 4 processor performance monitoring
• Active system cooling solutions

Thermal Management Procurement Notes

Verify the specific suffix 'R' indicates reel packaging when sourcing. Confirm RoHS compliance and lead-free status as per manufacturer specifications. Ensure the QSOP-24 package dimensions match your PCB footprint requirements. Check for moisture sensitivity levels if storage conditions exceed specified limits.

Thermal Management Selection Notes

Select this component for designs requiring integrated thermal management and multi-fan control in a single IC. Consider the SMBus address configuration options if multiple devices are used on the same bus. Evaluate the need for high versus low frequency fan drive signals based on the connected fan specifications.

Thermal Management Part Context

This part belongs to the ADT7476A series of remote thermal controllers and voltage monitors manufactured by onsemi. It succeeds previous generations like the ADT7468 with improved temperature accuracy and simplified power-up routines. The device integrates analog-to-digital conversion and limit comparators for comprehensive system health monitoring.

Thermal Management Replacement Considerations

The ADT7476A/D is the primary datasheet reference. Direct replacements should be verified against the feature comparison section regarding register availability and pin function swaps. No specific substitute part numbers are confirmed in the provided documentation.