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Texas Instruments TMP461AIRUNT-S
- Part No.:
- TMP461AIRUNT-S
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 10-WFQFN
- Datasheet:
-
TMP461AIRUNT-S.pdf
- Description:
- TEMPERATURE SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,903
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Product details
Overview
TMP461AIRUNT-S from Texas Instruments is a high-accuracy dual-channel temperature sensor IC integrating local and remote diode/junction sensing in a single WQFN-10 package. It delivers ±0.75°C remote and ±1°C local accuracy over –40°C to 125°C, operates from 1.7 V to 3.6 V, and interfaces via SMBus-compatible two-wire protocol - used for real-time thermal monitoring in multi-core processors and FPGAs.
For engineers reviewing the TMP461AIRUNT-S datasheet, TMP461AIRUNT-S pinout, TMP461AIRUNT-S application, or TMP461AIRUNT-S equivalent, key selection considerations include its pin-programmable SMBus address (9 options), series resistance cancellation up to 1 kΩ, programmable digital filtering (Level 1/2), η-factor and offset correction, and dual open-drain thermal alert outputs (THERM and ALERT/THERM2).
Technical Context
The TMP461AIRUNT-S implements a dedicated 12-bit ADC per channel (local + remote), with 0.0625°C resolution and conversion time of 15–17 ms per channel. Its remote sensing architecture supports discrete NPN/PNP transistors or integrated substrate diodes in microprocessors and ASICs, using D+ and D– differential inputs with built-in series resistance cancellation and differential capacitance tolerance up to 1000 pF.
It features dual interrupt outputs (THERM and ALERT/THERM2) configurable as thermal shutdown or fan-control signals, with independent limit registers, hysteresis control, and consecutive violation filtering (1–4 events). The device supports fast-mode (400 kHz) and high-speed mode (2.17 MHz) SMBus timing, with programmable filter, η-factor (1.008 typ), and shutdown current of 3 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over –40°C to 125°C - enables reliable board-level ambient sensing without calibration. |
| Remote Accuracy | ±0.75°C over 0°C to 100°C with diode - ensures precise junction temperature tracking for CPU/GPU thermal management. |
| Resolution | 0.0625°C (12-bit) - provides fine-grained thermal trend analysis for closed-loop fan control or throttling decisions. |
| Supply Range | 1.7 V to 3.6 V - compatible with modern low-voltage SoC domains and battery-backed systems. |
| Operating Current | 35 µA standby, 3 µA shutdown - extends runtime in always-on thermal monitoring applications. |
| SMBus Address | 9 pin-programmable options (A0/A1) - allows up to 9 sensors on one bus without address conflict. |
| Series Resistance Cancellation | Up to 1 kΩ - eliminates PCB trace resistance error without external compensation components. |
Pinout & Package
Package: 10-pin WQFN (2.00 mm × 2.00 mm, 0.5 mm pitch), moisture-sensitive level 2a, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | 1.7 V–3.6 V main supply; powers internal ADC, logic, and interface; requires local 100 nF decoupling. |
| GND | Ground reference | Analog/digital common return; must be low-impedance connection to minimize measurement noise. |
| D+ | Remote sensor positive input | Differential input for remote diode anode or transistor base; includes fault detection and series R cancellation. |
| D− | Remote sensor negative input | Differential input for remote diode cathode or transistor emitter; rejects common-mode noise up to 1000 pF. |
| THERM | Open-drain thermal alert output | Configurable as overtemperature shutdown signal; active-low, requires external pullup to 1.7–3.6 V. |
| ALERT/THERM2 | Open-drain dual-function output | Programmable as second thermal alert or alternate THERM output; shares hysteresis register with THERM. |
| SCL | SMBus clock input | Open-drain clock line; accepts 1 kHz–2.17 MHz; requires pullup resistor to same voltage domain as SDA. |
| SDA | SMBus data I/O | Bidirectional open-drain data line; supports read/write transactions; requires pullup resistor. |
| A0 | Address select input | Logic input setting LSB of SMBus address; connect to GND/V+/float for 3-state configuration. |
| A1 | Address select input | Logic input setting MSB of SMBus address; combined with A0 yields 9 unique addresses (0x48–0x4F, 0x51). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable digital filter (Level 1/2) | Moving average of 4 or 8 samples reduces noise-induced false alerts in electrically noisy server or telecom environments. |
| Series resistance cancellation | Compensates up to 1 kΩ trace resistance on D+/D− lines - removes need for board-level calibration or layout constraints. |
| η-factor and offset correction | Adjusts for non-ideal diode behavior (η = 1.008 typ) and fixed offset - improves accuracy across process/voltage/temperature corners. |
| Diode fault detection | Detects open-circuit, short-circuit (–64°C), and reverse-bias conditions on D+ - prevents erroneous thermal shutdowns. |
| Consecutive violation filtering (ALERT) | Configurable 1–4 limit breaches before asserting ALERT - suppresses transient spikes while retaining fast response to real overtemps. |
Applications
| Processor Thermal Monitoring | Telecom Base Station |
|---|---|
Use Scenario: Real-time junction temperature tracking of multi-core CPUs, GPUs, or FPGAs during dynamic workload scaling. IC Role / Device Role / Timing Role: Remote sensor measures die temperature via integrated substrate diode; local sensor monitors package ambient. Use Value: Enables precise thermal throttling and fan speed control with ±0.75°C remote accuracy and 0.0625°C resolution. |
Use Scenario: Thermal supervision of power amplifiers, RF transceivers, and DSP modules in outdoor 4G/5G base stations. IC Role / Device Role / Timing Role: Dual-channel sensor provides localized hotspot detection and system-level ambient reference. Use Value: Supports extended industrial temperature range (–40°C to 125°C) and SMBus multi-drop for compact, scalable monitoring. |
| Servers & Data Centers | LED Lighting Systems |
Use Scenario: High-density rack-mounted servers requiring accurate thermal mapping across CPUs, memory, and VRMs. IC Role / Device Role / Timing Role: Local sensor tracks board ambient; remote sensor monitors discrete power transistor junctions. Use Value: Pin-programmable SMBus addresses allow 9 sensors per bus; low 35 µA standby current minimizes system overhead. |
Use Scenario: Closed-loop thermal derating of high-power LED drivers to extend lumen maintenance and prevent color shift. IC Role / Device Role / Timing Role: Remote sensor placed at LED module heatsink; THERM output directly drives PWM dimming or shutdown logic. Use Value: Open-drain THERM output with hysteresis enables direct interface to MOSFET gate drivers without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote/local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMMX-1/NOPB | Lower remote accuracy (±1.5°C), no series resistance cancellation, 12-bit resolution, 3.0–3.6 V only. | Limited to narrow supply range and less demanding thermal accuracy requirements. | Select when cost sensitivity outweighs need for sub-1°C remote accuracy and 1.7 V operation. |
| MAX6642AESA+ | Fixed SMBus address (0x48), no pin-programmability; ±1°C remote accuracy; 10-bit resolution (0.25°C). | Suitable for simple point monitoring where multi-sensor bus sharing is unnecessary. | Choose for legacy designs already using MAX6642; avoid if flexible addressing or 0.0625°C resolution is required. |
Compared with LM95235CIMMX-1/NOPB and MAX6642AESA+, the TMP461AIRUNT-S offers superior remote accuracy (±0.75°C vs ±1.5°C/±1°C), wider supply range (1.7–3.6 V), finer resolution (0.0625°C), and hardware-based series resistance cancellation - making it optimal for high-density, low-voltage, precision thermal management.
Availability
TMP461AIRUNT-S is available at Aetrix Electronics and suitable for processor thermal monitoring, telecom equipment, and server cooling applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TMP461AIRUNT-S 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision sensing, power management, and interface solutions.
The TMP461AIRUNT-S belongs to TI's high-accuracy temperature sensor product line, designed specifically for multi-point thermal monitoring in computing, communications, and industrial systems where junction-level precision and SMBus scalability are critical.
FAQ
What is the operating temperature range of the TMP461AIRUNT-S?
The TMP461AIRUNT-S is specified to operate over an ambient temperature range of –40°C to 125°C. Its local sensor accuracy is ±1°C across this full range, while remote sensor accuracy is ±0.75°C from 0°C to 100°C and ±1.5°C from –40°C to 125°C. Junction temperature must not exceed 150°C under any condition.
Does the TMP461AIRUNT-S support multiple devices on the same SMBus?
Yes, the TMP461AIRUNT-S supports up to nine devices on a single SMBus through pin-programmable addresses using A0 and A1 inputs. These configure addresses from 0x48 to 0x4F and 0x51, enabling scalable thermal monitoring without address conflicts or external address translators.
How does series resistance cancellation work in the TMP461AIRUNT-S?
The TMP461AIRUNT-S automatically compensates for up to 1 kΩ of series resistance in the D+/D– traces using internal current-source switching and voltage measurement techniques. This eliminates temperature errors caused by PCB trace resistance or EMI filter resistors - no external calibration or software correction is needed.
Can the ALERT/THERM2 pin be used independently from THERM?
Yes, the ALERT/THERM2 pin (Pin 7) can be configured via bit 5 of the configuration register to function either as a second independent thermal alert output (THERM2) or as a standard SMBus ALERT signal. Both outputs share the same hysteresis register but support separate temperature limit thresholds.
What is the resolution and conversion time of the TMP461AIRUNT-S?
The TMP461AIRUNT-S provides 12-bit temperature data with 0.0625°C resolution for both local and remote channels. Each conversion takes 15–17 ms per channel in one-shot mode. The device supports continuous or on-demand conversion, with programmable digital filtering adding minimal latency (4 or 8-sample moving average).
TMP461AIRUNT-S Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -64°C ~ 191°C
- Output Type:
- SMBus
- Voltage - Supply:
- 1.7V ~ 3.6V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±1°C (±1.25°C)
- Test Condition:
- -10°C ~ 100°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-WQFN (2x2)
TMP461AIRUNT-S FAQ
1.How can I place an order for TMP461AIRUNT-S through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP461AIRUNT-S 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 TMP461AIRUNT-S reliable?
The price and inventory of TMP461AIRUNT-S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP461AIRUNT-S is usually 5 days.
3.What payment methods are accepted for TMP461AIRUNT-S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP461AIRUNT-S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP461AIRUNT-S?
TMP461AIRUNT-S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP461AIRUNT-S 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 TMP461AIRUNT-S?
For technical support, including TMP461AIRUNT-S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP461AIRUNT-S requirements.
6.How does Aetrix verify that TMP461AIRUNT-S is sourced from the original manufacturer or authorized distributors?
All TMP461AIRUNT-S 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 TMP461AIRUNT-S meets industry standards.
7.What is the process for return or replacement of TMP461AIRUNT-S?
All TMP461AIRUNT-S units undergo pre-shipment inspection (PSI). If there is an issue with TMP461AIRUNT-S, 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 TMP461AIRUNT-S part is unused and in its original packaging.
Return procedure for TMP461AIRUNT-S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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