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Analog Devices Inc. ADT7481ARMZ-1REEL
- Part No.:
- ADT7481ARMZ-1REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADT7481ARMZ-1REEL.pdf
- Description:
- CPU THERMAL AND VOLTAGE MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:919
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Product details
Overview
ADT7481ARMZ-1REEL from Analog Devices is a dual remote + local 3-channel digital temperature sensor IC with SMBus interface, ±1°C accuracy on remote diodes (0°C to +70°C), 0.25°C remote resolution, and two open-drain THERM outputs for thermal fail-safe control in PC and embedded thermal management systems.
For engineers reviewing the ADT7481ARMZ-1REEL datasheet, ADT7481ARMZ-1REEL pinout, ADT7481ARMZ-1REEL application, or ADT7481ARMZ-1REEL equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in CPU/GPU monitoring and smart battery thermal protection, and confirmed alternative parts with documented functional differences.
Technical Context
The ADT7481ARMZ-1REEL implements a chopper-stabilized ΔVBE measurement architecture for remote diode sensing, switching between two current sources (I and N×I) to reject VBE offset variation. It supports dual independent remote channels (D1+/D1−, D2+/D2−) and one on-chip local sensor, all digitized by an 11-bit ADC with programmable conversion rate (0.0625–64 Hz).
Its SMBus 2.0–compliant interface operates at up to 400 kHz with configurable ALERT/THERM2 pin function, register-based limit comparison (high/low/THERM thresholds), and fault detection for open-circuit diodes. The device features offset registers for system-level calibration and switchable temperature range (0°C to +127°C default or −64°C to +191°C extended mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Channels | 3-channel: 1 local (on-die) + 2 remote (external diode-connected transistors) |
| Remote Accuracy | ±1°C over 0°C to +70°C ambient; enables reliable CPU/GPU junction monitoring without system-level recalibration |
| Remote Resolution | 0.25°C (10-bit output); supports fine-grained thermal throttling decisions in high-performance computing |
| SMBus Address | Fixed 0x4C (ADT7481); allows direct integration into existing SMBus thermal management firmware without address conflict |
| Power Consumption | 240 μA typical operating current; reduces thermal load and extends runtime in battery-powered smart battery applications |
| Package | 10-lead MSOP (3 mm × 3 mm); fits space-constrained motherboard VRM zones and industrial controller PCBs |
| Operating Voltage | 3.0 V to 3.6 V; compatible with standard 3.3 V logic rails and avoids need for dedicated LDO |
Pinout & Package
ADT7481ARMZ-1REEL is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.5 mm pitch) with exposed pad for thermal dissipation. Pin functions are validated per Analog Devices ADT7481 Rev. 0 datasheet Figure 3 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts 3.0–3.6 V; powers internal ADC, SMBus interface, and bias circuits for remote diode sensing |
| D1+ / D1− (Pins 2, 3) | Remote Channel 1 diode interface | Differential pair for first external thermal diode (e.g., CPU die); rejects common-mode noise up to 100 mV |
| THERM (Pin 4) | Fail-safe comparator output | Open-drain output asserting low on THERM limit breach; directly drives cooling fan enable or CPU throttle signal |
| GND (Pin 5) | Supply ground reference | Common return for analog and digital sections; must be low-impedance to minimize measurement error from ground bounce |
| D2− / D2+ (Pins 6, 7) | Remote Channel 2 diode interface | Independent differential pair for second thermal diode (e.g., GPU or VRM MOSFET); supports simultaneous dual-die monitoring |
| ALERT/THERM2 (Pin 8) | Configurable interrupt/fail-safe output | Programmable as SMBus ALERT (interrupt) or second THERM output; enables dual-threshold fail-safe without external logic |
| SDATA (Pin 9) | SMBus bidirectional data line | Open-drain I/O with 5 pF max capacitance; requires external pull-up; supports multi-drop SMBus bus topology |
| SCLK (Pin 10) | SMBus clock input | Asynchronous clock input up to 400 kHz; timing compliant with SMBus 2.0 tLOW/tHIGH requirements |
Key Features
| Feature | Design Value |
|---|---|
| Dual remote + local sensing | Enables concurrent monitoring of CPU, GPU, and ambient temperature on single IC-reducing BOM count and layout complexity |
| Switchable temperature range | Software-selectable 0°C to +127°C (ADM1032-compatible) or −64°C to +191°C mode via Configuration Register Bit 2 |
| Programmable THERM limits | Independent high/low/THERM thresholds per channel stored in dedicated registers; supports adaptive fan control curves |
| Diode open-circuit detection | Automatic fault flag generation on D1/D2 disconnect; prevents false thermal shutdown in server or automotive ECU applications |
| Offset calibration registers | Per-channel offset adjustment (±127°C range) compensates for PCB trace resistance and diode nonlinearity in production systems |
| Low-power standby mode | 5 μA standby current with SMBus interface active; allows host processor to poll status without waking full thermal subsystem |
Applications
| CPU Thermal Monitoring | GPU Junction Sensing |
|---|---|
|
Use Scenario: Real-time die temperature tracking during high-load compute workloads in desktop/notebook platforms. IC Role / Device Role / Timing Role: Remote Channel 1 measures CPU thermal diode voltage; local sensor monitors ambient near VRM. Use Value: ±1°C remote accuracy ensures precise activation of Intel PROCHOT# or AMD TSI signals within 1°C of true junction temp. |
Use Scenario: Concurrent GPU and memory module temperature supervision in gaming laptops and AI edge accelerators. IC Role / Device Role / Timing Role: Remote Channel 2 interfaces discrete diode on GPU package; local sensor tracks heatsink baseplate. Use Value: 0.25°C resolution enables dynamic voltage/frequency scaling (DVFS) with <1°C hysteresis, reducing thermal throttling latency. |
| Smart Battery Pack Management | Industrial PLC Thermal Safety |
|
Use Scenario: Cell-level and pack ambient temperature supervision in Li-ion battery packs for portable medical devices. IC Role / Device Role / Timing Role: Local sensor monitors PCB temperature; Remote 1 senses thermistor-equipped cell tab via diode emulation. Use Value: Dual THERM outputs provide independent overtemp cutoff for charging circuitry and discharge path-meeting IEC 62133 safety requirements. |
Use Scenario: Overtemperature lockout for motor drive inverters and power supply modules in factory automation controllers. IC Role / Device Role / Timing Role: Remote Channel 1 monitors IGBT gate driver temperature; Remote 2 tracks heatsink fin temp. Use Value: Fail-safe THERM assertion at 105°C triggers hardware-level shutdown before silicon damage occurs, satisfying SIL-2 functional safety constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-channel thermal monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7481ARMZ | Same die, identical specs, but supplied in cut-tape (not reel); no electrical or functional difference | Identical use cases; preferred for low-volume prototyping or manual assembly | Select ADT7481ARMZ-1REEL for automated SMT production requiring 1,000-unit tape-and-reel delivery |
| ADT7481ARMZ-1 | SMBus address 0x4B (vs. 0x4C); otherwise identical pinout, registers, and performance | Required when multiple ADT7481 devices share same SMBus segment; avoids address collision | Choose ADT7481ARMZ-1 only if bus topology mandates alternate address; otherwise ADT7481ARMZ-1REEL is default production part |
Compared with ADT7481ARMZ and ADT7481ARMZ-1, the ADT7481ARMZ-1REEL provides identical thermal measurement capability and register compatibility while optimizing for high-volume SMT manufacturing via EIA-481-compliant 1,000-unit reel packaging and guaranteed tape integrity.
Availability
ADT7481ARMZ-1REEL is available at Aetrix Electronics and suitable for desktop/notebook thermal management, industrial PLC safety systems, and smart battery pack designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADT7481ARMZ-1REEL 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, serving precision instrumentation, industrial automation, and communications markets since 1965.
The ADT7481ARMZ-1REEL belongs to Analog Devices' precision thermal monitoring product line, engineered specifically for PC platform thermal management and embedded systems requiring robust remote diode sensing with fail-safe outputs.
FAQ
What is the SMBus address of the ADT7481ARMZ-1REEL?
The ADT7481ARMZ-1REEL has a fixed SMBus address of 0x4C. This address is hardwired and cannot be changed via pins or registers. It is distinct from the ADT7481ARMZ-1 variant (0x4B), enabling coexistence on the same SMBus segment when both parts are used. The ADT7481ARMZ-1REEL datasheet confirms this in the General Description section and Functional Block Diagram caption.
Does the ADT7481ARMZ-1REEL support extended temperature range operation?
Yes, the ADT7481ARMZ-1REEL supports an extended temperature measurement range of −64°C to +191°C, selectable via Bit 2 of Configuration Register 2. In this mode, it uses offset binary data format (values offset by +64). However, the actual usable range is constrained by the external diode's specification (typically −55°C to +150°C), and the IC itself is only guaranteed to operate from −40°C to +120°C ambient.
How many remote temperature sensors can the ADT7481ARMZ-1REEL monitor simultaneously?
The ADT7481ARMZ-1REEL monitors two remote temperature sensors concurrently via dedicated D1+/D1− and D2+/D2− terminals, plus one local on-die sensor-totaling three independent channels. Each remote channel supports diode-connected transistors or integrated thermal diodes (e.g., in CPUs/GPUs), with separate high/low/THERM limit registers and offset calibration for each.
What is the purpose of the ALERT/THERM2 pin (Pin 8) on the ADT7481ARMZ-1REEL?
Pin 8 (ALERT/THERM2) is a multifunction open-drain output configurable via Bit 5 of Configuration Register 1. When set to ALERT mode, it asserts low on any out-of-limit condition (local/remote high/low breach or diode open-circuit). When set to THERM2 mode, it functions as a second independent comparator output, enabling dual-threshold fail-safe control-for example, one THERM for fan enable and another for system shutdown.
Can the ADT7481ARMZ-1REEL measure temperature without external diodes?
Yes, the ADT7481ARMZ-1REEL can operate using only its internal local temperature sensor (measuring ambient PCB temperature near the IC), with remote channels disabled via the Conversion Rate/Channel Selector Register (Bits 5:4 = 01). In this mode, it delivers 1°C resolution and ±1°C accuracy from 0°C to +70°C, consuming only 240 μA-suitable for ambient monitoring in industrial controllers or power supplies where remote sensing is not required.
ADT7481ARMZ-1REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- 0°C ~ 127°C
- Sensing Temperature - Remote:
- -64°C ~ 191°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- -
- Features:
- One-Shot, Output Switch, Programmable Limit, Standby Mode
- Accuracy - Highest (Lowest):
- ±1°C (±2.5°C)
- Test Condition:
- 0°C ~ 70°C (-40°C ~ 100°C)
- Operating Temperature:
- -40°C ~ 120°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-MSOP
ADT7481ARMZ-1REEL FAQ
1.How can I place an order for ADT7481ARMZ-1REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7481ARMZ-1REEL 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 ADT7481ARMZ-1REEL reliable?
The price and inventory of ADT7481ARMZ-1REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7481ARMZ-1REEL is usually 5 days.
3.What payment methods are accepted for ADT7481ARMZ-1REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7481ARMZ-1REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7481ARMZ-1REEL?
ADT7481ARMZ-1REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7481ARMZ-1REEL 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 ADT7481ARMZ-1REEL?
For technical support, including ADT7481ARMZ-1REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7481ARMZ-1REEL requirements.
6.How does Aetrix verify that ADT7481ARMZ-1REEL is sourced from the original manufacturer or authorized distributors?
All ADT7481ARMZ-1REEL 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 ADT7481ARMZ-1REEL meets industry standards.
7.What is the process for return or replacement of ADT7481ARMZ-1REEL?
All ADT7481ARMZ-1REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADT7481ARMZ-1REEL, 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 ADT7481ARMZ-1REEL part is unused and in its original packaging.
Return procedure for ADT7481ARMZ-1REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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