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Analog Devices Inc. ADT7461AR-REEL7
- Part No.:
- ADT7461AR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADT7461AR-REEL7.pdf
- Description:
- SERIAL SWITCH/DIGITAL SENSOR, 3C
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
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Product details
Overview
ADT7461AR-REEL7 from Analog Devices is a dual-channel ±1°C remote/local temperature monitor IC with series resistance cancellation (up to 3 kΩ), 0.25°C remote resolution, and SMBus interface. It serves as a thermal management sensor in PC motherboard VRM zones, industrial controller thermal safety circuits, and smart battery pack monitoring-providing accurate diode-based remote sensing with noise-immune measurement.
For engineers reviewing the ADT7461AR-REEL7 datasheet, ADT7461AR-REEL7 pinout, ADT7461AR-REEL7 application, or ADT7461AR-REEL7 equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal accuracy across −55°C to +150°C extended range, real-world SMBus timing compliance (400 kHz), and two documented alternative parts for thermal monitoring system design.
Technical Context
The ADT7461AR-REEL7 implements a three-current ΔVBE measurement method to cancel series resistance on D+/D− lines-enabling accurate remote diode readings despite PCB trace resistance up to 3 kΩ (typ). Its chopper-stabilized amplifier and 65 kHz low-pass filter suppress noise while digitizing temperature data at 0.25°C resolution for remote and 1°C for local channels.
It supports dual-mode operation: default 0°C to +127°C range (binary format) or user-switchable −55°C to +150°C extended range (offset binary), with independent high/low/THERM limit registers per channel and programmable conversion rates from 0.0625 to 64 Hz. ALERT output is reconfigurable as THERM2 via register Bit 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C at +60°C to +100°C; enables precise CPU/GPU thermal throttling without calibration |
| Local Accuracy | ±3°C over −40°C to +100°C; sufficient for ambient board temperature monitoring |
| Series Resistance Cancellation | Up to 3 kΩ (typ); allows RC filtering on D+/D− lines for EMI immunity in noisy power supply environments |
| SMBus Interface | 400 kHz max clock; compatible with standard system management bus infrastructure in desktop/notebook platforms |
| Operating Current | 170 μA typical; supports low-power thermal monitoring in always-on embedded systems |
| Standby Current | 5.5 μA at −40°C to +85°C; enables energy-efficient thermal supervision during system sleep states |
| Temperature Range | −55°C to +150°C (extended mode); covers full operational envelope of silicon diodes in industrial and automotive applications |
Pinout & Package
ADT7461AR-REEL7 is housed in an 8-lead SOIC package (SOIC_N), with exposed pad not present. Pin functions are validated per Analog Devices Rev. B datasheet Figure 3 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts 3.0 V to 5.5 V; powers internal ADC, SMBus interface, and bias circuitry |
| D+ (Pin 2) | Remote sensor positive terminal | Connects to emitter/base of external PNP transistor or diode anode; carries switched current for ΔVBE measurement |
| D− (Pin 3) | Remote sensor negative terminal | Biased above GND by internal diode; rejects ground noise and enables series resistance cancellation |
| THERM (Pin 4) | Open-drain overtemperature comparator output | Drives cooling fan or CPU throttle signal when local/remote exceeds programmed THERM limit |
| GND (Pin 5) | Supply ground reference | Return path for VDD and analog measurement circuitry; must be low-impedance for accuracy |
| ALERT/THERM2 (Pin 6) | Configurable open-drain interrupt output | Default: SMBus alert; reprogrammable as second THERM output for dual-zone thermal control |
| SDATA (Pin 7) | SMBus bidirectional data line | Open-drain I/O requiring external pull-up; supports multi-drop SMBus addressing (0x4C default) |
| SCLK (Pin 8) | SMBus clock input | Asynchronous master-driven clock; defines timing for register reads/writes and conversion triggers |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel temperature sensing | Simultaneous local (on-chip) and remote (external diode) measurements enable board-level and component-level thermal profiling |
| Programmable THERM limits | Independent high/low thresholds per channel allow staged fan control or shutdown sequencing in multi-thermal-zone systems |
| Extended temperature range mode | −55°C to +150°C coverage supports industrial controllers and automotive under-hood modules beyond PC thermal specs |
| Offset register calibration | Per-channel offset registers compensate for sensor-specific drift or PCB layout-induced errors without hardware modification |
| Low-power standby mode | 5.5 μA quiescent current preserves battery life in portable smart battery packs while retaining SMBus accessibility |
Applications
| Desktop Computer Thermal Management | Notebook System Fan Control |
|---|---|
Use Scenario: Real-time CPU/GPU die temperature monitoring alongside VRM hot-spot tracking on ATX motherboards. IC Role / Device Role / Timing Role: Remote channel reads PNP transistor on processor package; local channel monitors chipset ambient; SMBus updates limits every 125 ms. Use Value: Enables dynamic fan speed adjustment within ±1°C accuracy, reducing acoustic noise while preventing thermal throttling. |
Use Scenario: Compact thermal supervision in space-constrained notebook baseboards with shared heat pipes and dual-core processors. IC Role / Device Role / Timing Role: Dual THERM outputs drive separate fans for CPU and GPU zones; ALERT signals critical overtemp to EC firmware. Use Value: Eliminates need for discrete comparators and reduces BOM count by integrating two independent thermal alarms in one 8-pin SOIC. |
| Industrial PLC Temperature Safety | Smart Battery Pack Monitoring |
Use Scenario: Overtemperature protection for motor drive inverters operating in −40°C to +85°C ambient industrial enclosures. IC Role / Device Role / Timing Role: Remote sensor monitors IGBT heatsink; local sensor validates ambient derating; extended range mode activated for −55°C cold-start validation. Use Value: Guarantees fail-safe shutdown at +150°C heatsink temperature with no calibration required, meeting IEC 61800-5-1 functional safety prerequisites. |
Use Scenario: Cell-level temperature monitoring in Li-ion battery packs with integrated fuel gauging and charge control ICs. IC Role / Device Role / Timing Role: Remote channel tracks hottest cell via dedicated diode; local channel monitors BMS ASIC junction; SMBus reports to host MCU every 2 seconds. Use Value: Provides ±1°C accuracy needed for JEITA-compliant charging profiles, preventing thermal runaway during fast-charge cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel temperature monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1032AR-REEL | No series resistance cancellation; fixed 0°C to +127°C range; identical pinout and SMBus address (0x4C) | Lacks noise immunity for long remote traces; unsuitable for high-EMI motor drive or VRM applications | Select ADM1032AR-REEL only when PCB layout ensures <100 Ω D+/D− series resistance and extended range is unnecessary |
| LM95235CIMM/NOPB | Higher remote accuracy (±0.75°C); SPI interface instead of SMBus; 10-lead MSOP package | Requires SPI host controller and different PCB footprint; better for custom embedded designs than standard SMBus platforms | Choose LM95235CIMM/NOPB when higher accuracy justifies SPI integration effort and MSOP layout is feasible |
Compared with ADM1032AR-REEL and LM95235CIMM/NOPB, ADT7461AR-REEL7 uniquely delivers 3 kΩ series resistance cancellation and switchable extended temperature range while maintaining SMBus compatibility and SOIC footprint-making it optimal for cost-sensitive, noise-prone PC and industrial thermal systems requiring no layout redesign.
Availability
ADT7461AR-REEL7 is available at Aetrix Electronics and suitable for desktop computer thermal management, industrial PLC safety circuits, and smart battery pack monitoring requiring stable component supply and guaranteed long-term availability.
Supply support for ADT7461AR-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, with R&D and manufacturing operations worldwide.
The ADT7461AR-REEL7 belongs to Analog Devices' precision thermal monitoring product line, engineered specifically for SMBus-based PC and industrial thermal management systems requiring robust remote diode sensing and noise-immune operation.
FAQ
What is the SMBus address of ADT7461AR-REEL7?
The ADT7461AR-REEL7 uses SMBus address 0x4C by default. This is fixed and non-configurable. The variant ADT7461-2 uses 0x4D, but ADT7461AR-REEL7 strictly adheres to 0x4C per Analog Devices Rev. B datasheet Section "Addressing the Device". No software or hardware configuration changes the address of ADT7461AR-REEL7.
Does ADT7461AR-REEL7 support both local and remote temperature sensing simultaneously?
Yes, ADT7461AR-REEL7 performs alternating conversions between its on-chip temperature sensor (local channel) and external diode-connected transistor (remote channel) in free-running mode. Both values are stored in dedicated registers (0x00 for local, 0x01/0x10 for remote high/low bytes) and updated continuously at the configured conversion rate-enabling real-time dual-point thermal visibility without host intervention.
How does series resistance cancellation work in ADT7461AR-REEL7?
ADT7461AR-REEL7 cancels up to 3 kΩ (typ) of total series resistance on D+/D− lines using a three-current ΔVBE measurement technique. By switching the remote sensor current among three precise ratios (I, N1×I, N2×I), it mathematically eliminates voltage drop error caused by parasitic resistance-delivering accurate temperature without requiring external calibration or PCB trace length restrictions.
Can ADT7461AR-REEL7 operate in the −55°C to +150°C temperature range?
Yes, ADT7461AR-REEL7 supports an extended measurement range of −55°C to +150°C when Bit 2 of the Configuration Register (0x03) is set to 1. In this mode, temperature data uses offset binary format (64°C offset), and remote sensor accuracy remains ±1°C within +60°C to +100°C. The IC itself must remain within its specified ambient operating range of −40°C to +120°C.
What is the function of Pin 6 (ALERT/THERM2) on ADT7461AR-REEL7?
Pin 6 on ADT7461AR-REEL7 is configurable via Configuration Register Bit 5: when cleared (default), it functions as an open-drain SMBus ALERT output signaling out-of-limit conditions; when set, it becomes a second open-drain THERM output for independent thermal control. The ALERT mask bit (Bit 7) only affects behavior when Pin 6 is in ALERT mode-not when configured as THERM2.
ADT7461AR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 120°C
- Sensing Temperature - Remote:
- -55°C ~ 150°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 5.5V
- Resolution:
- 8 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Standby Mode
- Accuracy - Highest (Lowest):
- ±3°C
- Test Condition:
- -40°C ~ 100°C
- Operating Temperature:
- -40°C ~ 120°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
ADT7461AR-REEL7 FAQ
1.How can I place an order for ADT7461AR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7461AR-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 ADT7461AR-REEL7 reliable?
The price and inventory of ADT7461AR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7461AR-REEL7 is usually 5 days.
3.What payment methods are accepted for ADT7461AR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7461AR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7461AR-REEL7?
ADT7461AR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7461AR-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 ADT7461AR-REEL7?
For technical support, including ADT7461AR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7461AR-REEL7 requirements.
6.How does Aetrix verify that ADT7461AR-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADT7461AR-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 ADT7461AR-REEL7 meets industry standards.
7.What is the process for return or replacement of ADT7461AR-REEL7?
All ADT7461AR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADT7461AR-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 ADT7461AR-REEL7 part is unused and in its original packaging.
Return procedure for ADT7461AR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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