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Analog Devices Inc. ADT7476ARQZ-REEL7
- Part No.:
- ADT7476ARQZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADT7476ARQZ-REEL7.pdf
- Description:
- CPU THERMAL AND VOLTAGE MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,869
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Product details
Overview
ADT7476ARQZ-REEL7 from Analog Devices is a dBCool® remote thermal controller and voltage monitor IC designed for active cooling management in noise- and power-sensitive systems. It monitors up to five voltages (+12V, +5V, +2.5V, VCCP, VCC), measures temperature via one on-chip and two remote diode sensors (−40°C to +125°C accuracy ±1.5°C), and controls four PWM fan outputs with high/low-frequency drive capability. It serves as the central thermal management unit in server motherboards and high-end desktop platforms.
For engineers reviewing the ADT7476ARQZ-REEL7 datasheet, ADT7476ARQZ-REEL7 pinout, ADT7476ARQZ-REEL7 application, or ADT7476ARQZ-REEL7 equivalent, key selection criteria include SMBus 2.0 compliance, bidirectional THERM interface for Intel Pentium 4 PROCHOT integration, automatic fan speed control loop tuning, and 24-lead QSOP package compatibility with legacy thermal monitoring layouts.
Technical Context
The ADT7476ARQZ-REEL7 implements a dual-mode thermal control architecture: it supports both manual PWM fan control and closed-loop automatic fan speed regulation based on real-time local/remote temperature inputs. Its 10-bit ADC digitizes analog voltage inputs (±1.5% TUE) and temperature sensor diode currents (180 μA high-level / 11 μA low-level sourcing), while its fan RPM-to-digital converter resolves speeds from 109 RPM to 10,000 RPM with ±6% accuracy at 0°C–70°C.
It features three configurable open-drain digital I/Os (PWM1–PWM3) supporting independent high/low-frequency PWM generation, plus dual-purpose pins including TACH1–TACH4 for tachometer input, VID0–VID5 for CPU voltage identification code capture, and reconfigurable THERM/SMBALERT/GPIO6 functions-all coordinated through an SMBus 2.0 interface operating at 10–400 kHz clock frequency with glitch immunity up to 50 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers full functionality including ADC, SMBus, and PWM drivers without external level-shifting. |
| Local Temp Accuracy | ±0.5°C (0°C–85°C), ±2.5°C (−40°C–+125°C) - enables precise board-level thermal calibration without external compensation. |
| Remote Diode Accuracy | ±0.5°C (0°C–85°C), ±2.5°C (−40°C–+125°C) - supports accurate CPU/die temperature tracking using standard 2N3904 or similar diodes. |
| Fan Control Outputs | 4 PWM channels (PWM1–PWM3 + shared PWM3/TACH4) - drives up to four fans with individual HF/LF mode selection per channel. |
| SMBus Interface | Compliant with SMBus 2.0 electrical specs - ensures interoperability with Intel ICH, AMD SB, and embedded BMC controllers. |
| Temperature Range | −40°C to +125°C operating - validated for use in industrial servers and telecom equipment with extended ambient requirements. |
| Package | 24-lead QSOP (0.154" body width) - surface-mount compatible with standard reflow profiles and IPC-7351B footprint. |
Pinout & Package
The ADT7476ARQZ-REEL7 is housed in a 24-lead QSOP package with 0.635 mm lead pitch and exposed pad for thermal dissipation. Pin 1 is SDA (SMBus data), pin 2 is SCL (SMBus clock), and pin 3 is GND - all conforming to JEDEC MS-013AC standard dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (Pin 1) | SMBus bidirectional data line | Open-drain I/O requiring external pull-up; handles register reads/writes and interrupt signaling via SMBALERT reconfiguration. |
| SCL (Pin 2) | SMBus clock input | Open-drain input synchronized to master clock; defines timing for all serial transactions including address latching and data transfer. |
| VCC (Pin 4) | Main power supply input | 3.3 V nominal supply powering internal logic, ADC, and PWM drivers; also monitored as system voltage rail. |
| TACH1–TACH4 (Pins 9,11,12,14) | Fan tachometer inputs | Open-drain inputs accepting 2–3 pulse-per-revolution signals; support fan presence detection and stall monitoring. |
| PWM1–PWM3 (Pins 5,24,13) | PWM fan drive outputs | Open-drain outputs requiring 10 kΩ pull-up; each configurable for high-frequency (25 kHz) or low-frequency (30 Hz) operation to balance acoustic noise vs. EMI. |
| D1+/D1−, D2+/D2− (Pins 17–20) | Remote diode sensor interfaces | Differential connections for two external thermal diodes; enable measurement of CPU/die and chipset temperatures with 0.25°C resolution. |
| THERM (Pin 14 / Pin 22) | Bidirectional thermal alert I/O | Configurable as input (to monitor PROCHOT from Intel CPUs) or output (to assert overtemperature shutdown); supports programmable hysteresis and timer-based assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Fan Speed Control Loop | Adjusts PWM duty cycle dynamically based on real-time temperature zones - reduces acoustic noise by minimizing unnecessary fan acceleration during light thermal loads. |
| Enhanced Acoustic Mode | Applies zone-specific smoothing filters to temperature inputs - prevents audible "step changes" in fan speed during transient thermal events. |
| Bidirectional THERM Interface | Supports both input (Intel PROCHOT monitoring) and output (system overtemperature shutdown) modes - eliminates need for external logic to coordinate thermal throttling. |
| VID Code Monitoring (VID0–VID5) | Captures CPU core voltage identification codes in real time - enables dynamic VCCP regulation and power state correlation in multi-core processors. |
| Extended Temperature Range | Measures up to +191°C on remote diodes - accommodates high-temperature GPU and ASIC thermal zones beyond standard CPU ranges. |
Applications
| Server Thermal Management | Desktop Platform Cooling |
|---|---|
Use Scenario: Real-time monitoring of CPU, memory, and VRM temperatures in dual-socket 1U/2U rack servers with redundant fans. IC Role / Device Role / Timing Role: Central thermal supervisor coordinating fan speed, voltage margining, and PROCHOT response across multiple thermal domains. Use Value: Enables predictive fan control that maintains <65 dB(A) acoustic output under full load while preventing thermal throttling below 85°C junction. | Use Scenario: Active cooling coordination in high-end gaming motherboards with discrete GPU, M.2 SSD, and overclocked CPU. IC Role / Device Role / Timing Role: Integrated voltage and temperature monitor interfacing with BIOS and OS-level thermal daemons via SMBus. Use Value: Delivers silent idle operation (<28 dB) and rapid fan ramp-up only when GPU diode exceeds 70°C - extending component lifespan. |
| Industrial Embedded Systems | Network Equipment Thermal Control |
Use Scenario: Fan and voltage supervision in fanless-to-fanned transition enclosures used in factory automation controllers. IC Role / Device Role / Timing Role: Standalone thermal manager operating independently of host processor during boot or firmware update cycles. Use Value: Maintains safe operation at −40°C to +85°C ambient with no software dependency - critical for unattended deployments. | Use Scenario: Multi-zone thermal regulation in 1RU network switches with ASIC, PHY, and power supply monitoring. IC Role / Device Role / Timing Role: Dual-diode temperature acquisition node feeding thermal telemetry to BMC over SMBus. Use Value: Detects localized hotspots near 100G optical modules and triggers targeted fan boost before ASIC derating occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermal monitoring and fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7475ARQZ-REEL7 | Lacks THERM bidirectional capability and VID5 input; supports only 3 fan PWM outputs and 1 remote diode channel. | Suitable for cost-optimized single-CPU systems without PROCHOT integration or dual-die thermal tracking. | Select when full ADT7476 feature set is unnecessary and BOM cost reduction is prioritized. |
| NCT7802Y | Offers 6 voltage monitors and 6 fan tach inputs but uses I²C (not SMBus 2.0) and lacks integrated PROCHOT handling logic. | Preferred in non-Intel platforms where SMBus-specific features like THERM auto-handshake are not required. | Choose when broader voltage monitoring scope is needed and host controller supports I²C-only timing. |
Compared with ADT7476ARQZ-REEL7, ADT7475ARQZ-REEL7 reduces thermal supervision granularity and removes critical Intel ecosystem features, while NCT7802Y expands analog monitoring breadth but sacrifices SMBus-native thermal protocol integration - making ADT7476ARQZ-REEL7 the optimal choice for Intel-based servers requiring PROCHOT-aware thermal protection.
Availability
ADT7476ARQZ-REEL7 is available at Aetrix Electronics and suitable for server motherboard design, industrial embedded thermal management, and high-performance desktop platform development requiring stable component supply and long-term lifecycle support.
Supply support for ADT7476ARQZ-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADT7476ARQZ-REEL7 belongs to the dBCool® family of thermal management ICs, engineered specifically for intelligent, low-noise active cooling in x86 server and desktop platforms with Intel processor compatibility.
FAQ
What is the primary function of the ADT7476ARQZ-REEL7 in a server motherboard?
The ADT7476ARQZ-REEL7 serves as the central thermal management controller, monitoring up to five voltage rails, measuring local and two remote temperatures, and driving four PWM fans with automatic speed control. It directly interfaces with Intel Pentium 4 and later processors via the THERM pin for PROCHOT coordination, enabling real-time thermal throttling and acoustic optimization - a core requirement in modern 1U/2U server designs where ADT7476ARQZ-REEL7 replaces discrete thermal supervision circuits.
Does the ADT7476ARQZ-REEL7 support both high-frequency and low-frequency PWM fan drive modes?
Yes, the ADT7476ARQZ-REEL7 supports independent configuration of high-frequency (25 kHz) and low-frequency (30 Hz) PWM drive on each of its three dedicated PWM outputs (PWM1–PWM3). This dual-mode capability allows system designers to select HF mode for reduced audible noise in quiet environments or LF mode for lower EMI in dense PCB layouts - a feature confirmed in the Functional Block Diagram and Register Configuration sections of the Rev. C datasheet for ADT7476ARQZ-REEL7.
Can the ADT7476ARQZ-REEL7 be used without an SMBus master controller?
No - the ADT7476ARQZ-REEL7 requires an SMBus 2.0 master (e.g., Intel ICH, AMD SB, or embedded BMC) for initialization, register programming, and runtime monitoring. All configuration, fan control parameters, temperature limits, and interrupt handling are performed exclusively over the SMBus interface; there is no standalone analog or parallel control mode. The ADT7476ARQZ-REEL7 does not retain user-programmed settings across power cycles without host firmware intervention.
What is the maximum remote temperature measurement range supported by the ADT7476ARQZ-REEL7?
The ADT7476ARQZ-REEL7 supports an extended remote temperature measurement range up to +191°C, as explicitly stated in the Features section of the Rev. C datasheet. This capability applies to both D1+ / D1− and D2+ / D2− diode inputs and is achieved through enhanced current sourcing (180 μA high-level / 11 μA low-level) and optimized ADC gain settings - enabling reliable thermal monitoring of high-power ASICs and GPUs where standard thermal sensors saturate below 125°C.
How many voltage rails can the ADT7476ARQZ-REEL7 monitor simultaneously?
The ADT7476ARQZ-REEL7 monitors five voltage rails simultaneously: +12VIN, +5VIN, +2.5VIN, VCCP (processor core voltage), and VCC (internal supply, also monitored via Pin 4). Each input has dedicated attenuation and multiplexing circuitry, with total unadjusted error specified at ±1.5% for non-12V channels and ±2% for the +12VIN channel - ensuring accurate power integrity validation across server and desktop power delivery networks using ADT7476ARQZ-REEL7.
ADT7476ARQZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- dBCool®
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 125°C
- Accuracy:
- ±2.5%
- Topology:
- ADC, Comparator, Fan Speed Counter, Multiplexer, Register Bank
- Output Type:
- SMBus
- Output Alarm:
- No
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QSOP
ADT7476ARQZ-REEL7 FAQ
1.How can I place an order for ADT7476ARQZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7476ARQZ-REEL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADT7476ARQZ-REEL7 reliable?
The price and inventory of ADT7476ARQZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7476ARQZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADT7476ARQZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7476ARQZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7476ARQZ-REEL7?
ADT7476ARQZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7476ARQZ-REEL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADT7476ARQZ-REEL7?
For technical support, including ADT7476ARQZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7476ARQZ-REEL7 requirements.
6.How does Aetrix verify that ADT7476ARQZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADT7476ARQZ-REEL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADT7476ARQZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADT7476ARQZ-REEL7?
All ADT7476ARQZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADT7476ARQZ-REEL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADT7476ARQZ-REEL7 part is unused and in its original packaging.
Return procedure for ADT7476ARQZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7476ARQZ-REEL7 Tags
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Microchip Technology
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EMC2101-R-ACZL-TR
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