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Analog Devices Inc. ADT7461AR-REEL
- Part No.:
- ADT7461AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADT7461AR-REEL.pdf
- Description:
- SERIAL SWITCH/DIGITAL SENSOR, 3C
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
ADT7461AR-REEL from Analog Devices is a dual-channel digital temperature monitor IC with on-chip local sensor and remote diode sensing capability, ±1°C accuracy on remote channel, 0.25°C resolution, series resistance cancellation up to 3 kΩ, and SMBus 2-wire interface - used for thermal management in desktop PCs and industrial controllers.
For engineers reviewing the ADT7461AR-REEL datasheet, ADT7461AR-REEL pinout, ADT7461AR-REEL application, or ADT7461AR-REEL equivalent, key selection criteria include remote sensor accuracy (±1°C), series resistance cancellation capability, dual THERM outputs, SMBus address 0x4C, and SOIC-8 package compatibility with ADM1032.
Technical Context
The ADT7461AR-REEL implements a three-current ΔVBE measurement method to enable automatic cancellation of up to 3 kΩ series resistance on D+ and D− lines, allowing robust remote sensing in noisy environments with optional RC filtering. It supports two temperature ranges: default 0°C to +127°C and extended −55°C to +150°C, selected via Bit 2 of the Configuration Register.
It features dual open-drain outputs - THERM (Pin 4) and configurable ALERT/THERM2 (Pin 6) - both programmable as overtemperature comparators with independent high/low limits. Communication occurs over SMBus-compliant 2-wire interface (SCLK/SDATA) at up to 400 kHz, with register-level control of conversion rate, offset calibration, and fault detection.
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 external calibration |
| Local Accuracy | ±3°C (−40°C to +100°C); sufficient for ambient board temperature monitoring |
| Resolution | 0.25°C (remote), 1°C (local); supports fine-grained fan speed control and alarm hysteresis tuning |
| Series Resistance Cancellation | Up to 3 kΩ (typical); allows insertion of RC filters on D+/D− lines to suppress EMI without measurement error |
| SMBus Address | 0x4C (fixed for ADT7461AR-REEL); ensures interoperability with standard thermal management firmware |
| Supply Current | 170 μA operating / 5.5 μA standby; minimizes power impact in always-on thermal monitoring systems |
| Package | 8-lead SOIC; industry-standard footprint compatible with ADM1032 PCB layouts |
Pinout & Package
ADT7461AR-REEL is housed in an 8-lead SOIC package (body width 3.9 mm, JEDEC MS-012AA), with exposed pad not connected internally. Thermal resistance θJA = 121°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts 3.0 V to 5.5 V; undervoltage lockout activates below 2.2 V to prevent erroneous readings |
| D+ (Pin 2) | Remote sensor positive terminal | Connects to emitter/base of external PNP transistor or integrated diode; biased internally |
| D− (Pin 3) | Remote sensor negative terminal | Biased above GND by internal diode to reject ground noise; supports series RC filtering |
| THERM (Pin 4) | Primary overtemperature comparator output | Open-drain, active-low; drives cooling fans directly with pull-up to VDD |
| GND (Pin 5) | Supply ground reference | Single-point grounding recommended to avoid measurement offset from return path noise |
| ALERT/THERM2 (Pin 6) | Configurable secondary output | Software-selectable as SMBus alert interrupt or second THERM output via Configuration Register Bit 5 |
| SDATA (Pin 7) | SMBus bidirectional data line | Open-drain, requires external pull-up; supports multi-drop bus with collision detection |
| SCLK (Pin 8) | SMBus clock input | Asynchronous master-controlled timing; tolerates 400 kHz max frequency per SMBus spec |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel temperature sensing | Simultaneous local (on-die) and remote (external diode/transistor) measurement with independent limit registers |
| Series resistance cancellation | Automatically removes up to 3 kΩ parasitic resistance on D+/D− lines - eliminates need for manual calibration or layout constraints |
| Extended temperature range | Switchable −55°C to +150°C mode (via Config Reg Bit 2) enables monitoring of wide-range industrial sensors |
| Programmable THERM outputs | Two independent overtemperature comparators (THERM + ALERT/THERM2) support redundant fan control or multi-zone thermal shutdown |
| Low-power operation | 5.5 μA standby current allows continuous monitoring in battery-backed or energy-sensitive systems |
Applications
| Desktop PC Thermal Management | Industrial PLC Temperature Monitoring |
|---|---|
Use Scenario: Real-time CPU, GPU, and VRM temperature tracking in ATX motherboards with dynamic fan speed control and critical overtemperature shutdown. IC Role / Device Role / Timing Role: Primary remote temperature monitor interfacing with system BIOS/firmware via SMBus; provides THERM signal for immediate hardware-level fan activation. Use Value: ±1°C remote accuracy and 3 kΩ series resistance cancellation ensure stable readings despite PCB trace resistance and switching noise from nearby power stages. | Use Scenario: Ambient and motor winding temperature supervision in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Dual-sensor thermal watchdog feeding into safety-rated control logic; uses extended −55°C to +150°C range to cover full industrial operating envelope. Use Value: Pin- and register-compatibility with ADM1032 allows drop-in replacement in legacy designs while adding series resistance cancellation for improved field reliability. |
| Smart Battery Pack Protection | Test Equipment Thermal Calibration |
Use Scenario: Cell-level and pack-ambient temperature monitoring in Li-ion battery packs for charge/discharge thermal cutoff and state-of-health estimation. IC Role / Device Role / Timing Role: Remote diode senses cell temperature via embedded PNP; local sensor monitors BMS IC junction; both channels feed protection algorithm via SMBus. Use Value: 0.25°C remote resolution enables precise delta-T detection between cells, supporting balanced charging and early thermal runaway warning. | Use Scenario: Reference-grade temperature acquisition in benchtop multimeters and calibration sources requiring traceable thermal stability verification. IC Role / Device Role / Timing Role: High-accuracy remote sensor interface for thermocouple cold-junction compensation and internal thermal drift correction. Use Value: Offset registers allow system-level calibration against NIST-traceable standards, achieving end-to-end thermal measurement uncertainty under ±1.5°C. |
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 register map | Lacks noise-immune remote sensing; unsuitable where long D+/D− traces or EMI are present | Select ADM1032AR-REEL only when legacy compatibility is mandatory and PCB layout avoids series resistance |
| ADT7462ARZ-REEL7 | Includes built-in 10-bit ADC for auxiliary voltage monitoring; same remote accuracy but higher quiescent current (220 μA) | Supports voltage + temperature co-monitoring in space-constrained power supplies | Choose ADT7462ARZ-REEL7 when simultaneous rail voltage supervision is required alongside thermal management |
Compared with ADM1032AR-REEL, ADT7461AR-REEL adds critical series resistance cancellation and extended temperature range without changing PCB layout; versus ADT7462ARZ-REEL7, it offers lower power and simpler integration where voltage monitoring is unnecessary.
Availability
ADT7461AR-REEL is available at Aetrix Electronics and suitable for desktop PC thermal management, industrial PLC temperature monitoring, and smart battery pack protection requiring stable component supply, long-term lifecycle support, and guaranteed authentic Analog Devices sourcing.
Supply support for ADT7461AR-REEL 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADT7461AR-REEL belongs to Analog Devices' thermal management IC product line, designed specifically for reliable, high-accuracy temperature monitoring in computing, industrial, and battery-powered systems where noise immunity and calibration flexibility are critical.
FAQ
What is the SMBus address of the ADT7461AR-REEL?
The ADT7461AR-REEL has a fixed SMBus address of 0x4C. This is hardwired and cannot be changed via hardware pins or software configuration. The ADT7461-2 variant uses 0x4D, but ADT7461AR-REEL strictly uses 0x4C - confirmed in the General Description and Pin Configuration sections of Rev. B datasheet. Firmware must target this address to communicate with ADT7461AR-REEL.
Does the ADT7461AR-REEL support remote temperature sensing with series resistance cancellation?
Yes, the ADT7461AR-REEL supports automatic series resistance cancellation of up to 3 kΩ (typical) on the D+ and D− inputs. This feature compensates for PCB trace resistance and filter components, eliminating temperature offset errors without user calibration. It is enabled by default and operates transparently during normal ΔVBE measurements - a core differentiator from the pin-compatible ADM1032.
What is the accuracy specification of the ADT7461AR-REEL on its remote channel?
The ADT7461AR-REEL achieves ±1°C accuracy on the remote channel under conditions of +60°C ≤ TA ≤ +100°C, −55°C ≤ TD ≤ +150°C, and 3 V ≤ VDD ≤ 3.6 V. At wider temperature and supply ranges (−40°C ≤ TA ≤ +120°C, 3 V ≤ VDD ≤ 5.5 V), remote accuracy is ±3°C. These values are specified in Table 1 of the Rev. B datasheet and apply directly to ADT7461AR-REEL.
Can the ADT7461AR-REEL operate in extended temperature range mode?
Yes, the ADT7461AR-REEL supports an extended temperature measurement range of −55°C to +150°C, selectable via Bit 2 of the Configuration Register (Address 0x03). When enabled, the device uses offset binary data format and updates temperature registers accordingly. The local sensor remains functional in this mode, though the IC itself must remain within its absolute maximum ambient range (−40°C to +120°C).
How many THERM outputs does the ADT7461AR-REEL provide?
The ADT7461AR-REEL provides up to two THERM outputs: dedicated THERM (Pin 4) and configurable ALERT/THERM2 (Pin 6). Pin 6's function is controlled by Bit 5 of the Configuration Register - setting it to '1' reassigns ALERT to a second THERM output. Both outputs are open-drain, active-low, and independently programmable with separate high/low limits, enabling dual-zone thermal control.
ADT7461AR-REEL 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 ~ 125°C
- Sensing Temperature - Remote:
- -40°C ~ 125°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 5.5V
- Resolution:
- -
- Features:
- One-Shot, Programmable Limit, Standby Mode
- Accuracy - Highest (Lowest):
- ±3°C
- Test Condition:
- -40°C ~ 100°C
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
ADT7461AR-REEL FAQ
1.How can I place an order for ADT7461AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7461AR-REEL 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-REEL reliable?
The price and inventory of ADT7461AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7461AR-REEL is usually 5 days.
3.What payment methods are accepted for ADT7461AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7461AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7461AR-REEL?
ADT7461AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7461AR-REEL 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-REEL?
For technical support, including ADT7461AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7461AR-REEL requirements.
6.How does Aetrix verify that ADT7461AR-REEL is sourced from the original manufacturer or authorized distributors?
All ADT7461AR-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of ADT7461AR-REEL?
All ADT7461AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADT7461AR-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for ADT7461AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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