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Texas Instruments TMP441AIDCNT
- Part No.:
- TMP441AIDCNT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-8
- Datasheet:
-
TMP441AIDCNT.pdf
- Description:
- SENSOR DIGITAL -40C-125C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:756
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Product details
Overview
TMP441AIDCNT from Texas Instruments is a precision ±1°C remote/local dual-junction temperature sensor IC in SOT23-8, featuring automatic beta compensation, series resistance cancellation (up to 1 kΩ), and η-factor correction for NPN/PNP transistors or diodes used as remote sensors. It delivers 12-bit resolution (0.0625°C LSB) on both local and single remote channel, operating from –40°C to +125°C ambient with 2.7V–5.5V supply - deployed in processor/FPGA thermal monitoring and telecom equipment.
For engineers reviewing the TMP441AIDCNT datasheet, TMP441AIDCNT pinout, TMP441AIDCNT application, or TMP441AIDCNT equivalent, this page provides verified technical context, SMBus interface timing, diode fault detection capability, conversion rate trade-offs (12–137 ms), and real-world design meaning of beta/η-series compensation - all validated against TI SBOS425A (March 2009).
Technical Context
The TMP441AIDCNT implements a two-wire SMBus-compatible interface with programmable conversion rate (0.0625–8 conversions/s), auto-ranging beta compensation (β = 0.1–27), and configurable ideality factor (η = 1.000–1.008). It supports GND-collector and diode-connected transistor configurations with differential input capacitance tolerance up to 500 pF when beta correction is enabled.
Its architecture separates local die sensing (±0.25°C typical error at 0°C–100°C) from remote junction measurement using dedicated DXP/DXN terminals, with independent high-precision current sources (6–120 µA) and series resistance cancellation logic that eliminates offset without calibration - critical for PCB trace-induced errors in server and storage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±0.25°C max (0°C to +100°C, 3.3V supply) - enables tight thermal throttling margins in CPU/GPU subsystems |
| Remote Accuracy | ±0.25°C max (0°C to +100°C, remote diode at –40°C to +150°C) - supports reliable FPGA junction monitoring across process corners |
| Resolution | 12-bit (1°C integer + 0.0625°C fractional) - allows precise delta-T tracking between die and remote node |
| Supply Range | 2.7V to 5.5V - compatible with 3.3V and 5V system rails without level-shifting |
| Quiescent Current | 35–45 µA at 0.0625 conv/s; 0.7–1 mA at 8 conv/s - balances low-power idle state with responsive thermal polling |
| SMBus Speed | Up to 3.4 MHz clock frequency - supports fast register reads during thermal event escalation |
| Diode Fault Detection | Integrated open/short diagnostics on DXP/DXN - prevents false thermal shutdown in telecom line cards |
Pinout & Package
SOT23-8 package (DCN marking), 2.9 mm × 1.6 mm × 1.1 mm body, thermally enhanced leadframe for θJA = 170°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: DXP | Positive remote sensor terminal | Connects to collector/base of PNP or anode of diode; bias current sourced internally |
| 2: DXN | Negative remote sensor terminal | Connects to emitter of PNP or cathode of diode; completes remote junction sensing loop |
| 3: A1 | MSB address pin | Configures SMBus slave address (100 11xx); enables multi-drop bus with up to four TMP441 devices |
| 4: A0 | LSB address pin | Combines with A1 to set one of four unique addresses (100 1100 to 100 1111) |
| 5: GND | Analog/digital ground reference | Single ground plane required; decoupling capacitor must be placed adjacent to V+ and GND pins |
| 6: SDA | Open-drain SMBus data line | Requires external pull-up to V+; supports write byte, read byte, send byte, receive byte commands |
| 7: SCL | Open-drain SMBus clock line | Requires external pull-up to V+; tolerates 3.4 MHz operation per SMBus v2.0 spec |
| 8: V+ | Positive supply input | Accepts 2.7V–5.5V; internal UVLO (2.3–2.6V) and POR (1.6–2.3V) ensure robust power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Automatic beta compensation | Dynamically adjusts for β drift down to 0.1 across temperature, eliminating manual calibration for legacy PNP transistors in microprocessors |
| Series resistance cancellation | Removes up to 1 kΩPCB trace resistance error without external components - critical for long-sensor runs in blade servers |
| η-factor correction | Programmable ideality factor (1.000–1.008) matches physical diode characteristics, improving accuracy for non-ideal silicon junctions |
| Diode fault detection | Real-time open-circuit and short-circuit diagnosis on DXP/DXN - prevents thermal runaway in unattended telecom gear |
| Extended temperature range | Configurable –64°C to +191°C measurement (via RANGE bit), though rated ambient remains –40°C to +125°C per spec |
Applications
| Processor Thermal Monitoring | FPGA Junction Sensing |
|---|---|
|
Use Scenario: Real-time die temperature tracking of x86 CPUs or ARM SoCs during dynamic voltage/frequency scaling. IC Role / Device Role / Timing Role: Local sensor measures package die temperature; remote channel monitors discrete transistor near VRM hot spot. Use Value: Enables accurate thermal throttling within ±0.25°C margin, preventing unnecessary performance derating while avoiding thermal shutdown. |
Use Scenario: Monitoring junction temperature of high-density FPGAs in reconfigurable compute accelerators. IC Role / Device Role / Timing Role: Remote channel interfaces with on-die PNP transistor; local channel tracks ambient board temperature for offset compensation. Use Value: Delivers ±0.25°C remote accuracy without factory calibration, reducing test time and BOM cost versus analog solutions. |
| Central Office Telecom Equipment | Storage Area Networks (SAN) |
|
Use Scenario: Thermal supervision of line cards and power modules in carrier-grade DSLAMs and OLTs operating 24/7. IC Role / Device Role / Timing Role: Monitors remote diode on ASIC heat sink and local die temp; uses SMBus timeout (25–35 ms) for robust comms in noisy environments. Use Value: Diode fault detection triggers fail-safe alerts before thermal damage occurs, supporting NEBS Level 3 reliability requirements. |
Use Scenario: Temperature profiling across multiple HDD/SSD bays and controller ASICs in enterprise RAID enclosures. IC Role / Device Role / Timing Role: Single TMP441AIDCNT per controller board senses local SoC temp and remote diode on backplane connector. Use Value: SMBus multi-address support (A1/A0) allows daisy-chained monitoring of 4+ zones with minimal GPIO overhead. |
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 |
|---|---|---|---|
| TMP451AIDRVR | Same SOT23-6 package but no address pins; fixed SMBus address (100 1100); adds alert output pin | Lacks A1/A0 for multi-drop flexibility; alert pin simplifies interrupt-driven thermal management in space-constrained designs | Select TMP451AIDRVR when SMBus address count is not needed and hardware interrupt signaling is preferred over polling |
| LM95235EIMMX/NOPB | 2-channel remote + local, 13-bit resolution, SPI/I²C interface, wider remote range (–64°C to +150°C), no beta compensation | Requires external calibration for β variation; better suited for multi-sensor racks where SPI bandwidth > SMBus latency | Choose LM95235EIMMX/NOPB for higher-resolution multi-zone monitoring where beta drift is mitigated by system-level calibration |
Compared with TMP441AIDCNT, TMP451AIDRVR trades address flexibility for integrated alert functionality and smaller footprint, while LM95235EIMMX/NOPB offers higher resolution and dual remote channels at the cost of requiring external beta characterization - making TMP441AIDCNT optimal for calibrated-free, SMBus-based embedded thermal control.
Availability
TMP441AIDCNT is available at Aetrix Electronics and suitable for processor thermal monitoring, FPGA junction sensing, and central office telecom equipment requiring stable component supply across extended product lifecycles.
Supply support for TMP441AIDCNT 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in precision sensing and power management ICs.
The TMP441AIDCNT belongs to TI's high-accuracy temperature sensor product line, designed specifically for embedded thermal management in computing, telecom, and storage infrastructure where calibration-free remote diode sensing is mandatory.
FAQ
What is the maximum remote temperature measurement range supported by the TMP441AIDCNT?
The TMP441AIDCNT supports a remote temperature measurement range of –40°C to +150°C per its electrical specifications. When configured for extended range mode (RANGE bit = 1 in Configuration Register 1), it can report values from –64°C to +191°C - however, accuracy degrades outside the specified –40°C to +150°C diode range, and the device's ambient operating limit remains –40°C to +125°C. The TMP441AIDCNT achieves ±0.25°C typical error within 0°C to +100°C under standard conditions.
Does the TMP441AIDCNT require external calibration for different transistor types?
No, the TMP441AIDCNT does not require external calibration for different transistor types. It features automatic beta compensation (β = 0.1 to 27), programmable η-factor correction (1.000–1.008), and series resistance cancellation - enabling accurate remote sensing across NPN, PNP, and diode-connected configurations without per-unit trimming. This capability is validated across multiple IC manufacturers' transistors, as confirmed in TI SBOS425A Section "Remote Accuracy".
How does the TMP441AIDCNT handle series resistance in the remote sensor path?
The TMP441AIDCNT cancels series resistance up to 1 kΩwhen beta correction is disabled (RC = 0), and up to 300 Ωwhen beta correction is enabled (RC = 1). This is implemented via dual-current-source measurement and internal calculation - eliminating offset errors caused by PCB trace resistance or connector impedance. The effect is visible in Figure 7 and Figure 8 of the TMP441AIDCNT datasheet, showing <±0.5°C error contribution even with 500 Ωseries resistance under auto-beta mode.
What SMBus commands are supported by the TMP441AIDCNT?
The TMP441AIDCNT supports SMBus v2.0-compliant commands including Write Byte, Read Byte, Send Byte, and Receive Byte - sufficient for full configuration, temperature register access, and status interrogation. It does not support Block Write/Read or Process Call. The device uses an 8-bit pointer register to select target registers (e.g., 00h for local temp high byte, 01h for remote temp high byte), and requires sequential high-then-low byte reads for full 16-bit temperature values.
Can the TMP441AIDCNT operate with a 2.5V supply?
No, the TMP441AIDCNT cannot operate reliably with a 2.5V supply. Its absolute maximum rating specifies minimum supply voltage of 2.7V, and undervoltage lockout (UVLO) activates below 2.3–2.6V. Operation below 2.7V risks incomplete SMBus communication, inaccurate ADC conversion, or failure to exit reset. For 2.5V systems, consider TI's TMP1075 or alternative 1.8V–5.5V sensors - the TMP441AIDCNT is strictly specified for 2.7V–5.5V operation per SBOS425A Electrical Characteristics table.
TMP441AIDCNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- 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:
- 2.7V ~ 5.5V
- Resolution:
- 11 b
- Features:
- One-Shot, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1°C (±2.5°C)
- Test Condition:
- 0°C ~ 100°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 127°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-8
TMP441AIDCNT FAQ
1.How can I place an order for TMP441AIDCNT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP441AIDCNT 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 TMP441AIDCNT reliable?
The price and inventory of TMP441AIDCNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP441AIDCNT is usually 5 days.
3.What payment methods are accepted for TMP441AIDCNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP441AIDCNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP441AIDCNT?
TMP441AIDCNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP441AIDCNT 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 TMP441AIDCNT?
For technical support, including TMP441AIDCNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP441AIDCNT requirements.
6.How does Aetrix verify that TMP441AIDCNT is sourced from the original manufacturer or authorized distributors?
All TMP441AIDCNT 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 TMP441AIDCNT meets industry standards.
7.What is the process for return or replacement of TMP441AIDCNT?
All TMP441AIDCNT units undergo pre-shipment inspection (PSI). If there is an issue with TMP441AIDCNT, 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 TMP441AIDCNT part is unused and in its original packaging.
Return procedure for TMP441AIDCNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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