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Texas Instruments TMP442ADCNT
- Part No.:
- TMP442ADCNT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-8
- Datasheet:
-
TMP442ADCNT.pdf
- Description:
- SENSOR DIGITAL -40C-125C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:7,505
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Product details
Overview
TMP442ADCNT from Texas Instruments is a dual-channel remote temperature sensor IC with integrated local die sensing, ±1°C remote diode accuracy (0°C to +100°C), 12-bit resolution per channel, SMBus™/Two-Wire interface, and SOT23-8 package. It monitors processor/FPGA junction temperatures using two external PNP/NPN transistors or diodes in telecom servers and storage area networks.
For engineers reviewing the TMP442ADCNT datasheet, TMP442ADCNT pinout, TMP442ADCNT application, or TMP442ADCNT equivalent, this page delivers verified specifications, validated dual-remote-channel operation, confirmed SOT23-8 pin mapping, and real-world thermal monitoring use cases for embedded industrial and computing systems.
Technical Context
The TMP442ADCNT implements dual independent remote junction sensing channels with automatic beta compensation, series resistance cancellation (up to 300Ω with beta correction enabled), and programmable η-factor (1.000–1.008). Each channel supports diode-connected or GND-collector transistor configurations.
It uses collector-current-based remote sensing (not emitter-current) to maintain accuracy across low-beta transistors (β down to 0.1), with conversion times of 36–137 ms depending on beta correction and RC settings. Local and remote measurements both deliver 0.0625°C resolution via 16-bit registers (high/low byte).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C max over 0°C to +100°C ambient and –40°C to +150°C diode range - enables uncalibrated multi-IC thermal monitoring without per-device trimming. |
| Local Accuracy | ±0.25°C typical at 0°C to +100°C - provides precise die temperature reference for thermal throttling decisions. |
| Interface | SMBus 2.0 compliant (3.4 MHz max clock) with write/read/send/receive byte commands - interoperates with standard system management controllers. |
| Supply Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic rails in servers and telecom equipment. |
| Quiescent Current | 35–45 µA at 0.0625 conversions/sec; 0.7–1 mA at 8 conversions/sec - supports low-power thermal polling in always-on subsystems. |
| Temperature Range | –40°C to +125°C ambient operating range; remote sensing up to +150°C - meets industrial and extended-computing environmental requirements. |
| Resolution | 12-bit local and remote channels, 0.0625°C LSB - enables fine-grained thermal margining and fan-speed control. |
Pinout & Package
SOT23-8 package (DCN designation), 2.9 mm × 2.8 mm × 1.3 mm body, lead pitch 0.65 mm, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DXP1 | Channel 1 remote sensor positive terminal | Connects to collector/base of PNP or anode of diode; forms differential pair with DXN1 for junction voltage measurement. |
| 2 - DXN1 | Channel 1 remote sensor negative terminal | Connects to emitter of PNP or cathode of diode; completes remote sensing loop with DXP1. |
| 3 - DXP2 | Channel 2 remote sensor positive terminal | Independent second remote input - enables simultaneous CPU + GPU or ASIC + memory thermal monitoring. |
| 4 - DXN2 | Channel 2 remote sensor negative terminal | Differential partner to DXP2; electrically isolated from Channel 1 path to prevent crosstalk. |
| 5 - GND | Analog and digital ground reference | Single ground connection shared by all sensing and interface circuits; requires low-impedance PCB return path. |
| 6 - SDA | SMBus serial data line | Open-drain output/input requiring external pull-up to V+; supports multi-drop bus with other SMBus devices. |
| 7 - SCL | SMBus serial clock line | Open-drain input requiring external pull-up; defines timing for read/write transactions; 3.4 MHz max frequency. |
| 8 - V+ | Positive supply input | Accepts 2.7–5.5 V; powers internal ADC, logic, and bias circuits; bypass capacitor (0.1 µF) required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual remote + local sensing | Simultaneous measurement of three distinct thermal zones (e.g., CPU die, VRM, FPGA junction) in one SOT23-8 footprint. |
| Automatic beta compensation | Adapts to β as low as 0.1 without user configuration - eliminates calibration for legacy or low-gain transistors in aging systems. |
| Series resistance cancellation | Compensates up to 300 Ω trace resistance on remote lines - removes offset error from long PCB runs between sensor and IC. |
| η-factor correction | Programmable ideality factor (1.000–1.008) - matches physical characteristics of discrete diodes or integrated PNP transistors. |
| Diode fault detection | Identifies open-circuit, short-circuit, and reverse-biased conditions on either remote channel - prevents false thermal shutdowns. |
Applications
| Processor Thermal Monitoring | FPGA Junction Sensing |
|---|---|
|
Use Scenario: Real-time die temperature tracking in x86 microprocessors during high-load compute cycles. IC Role / Device Role / Timing Role: Local sensor measures CPU die temperature; remote channels monitor VRM and package hotspot thermistors via external PNP transistors. Use Value: Enables dynamic thermal throttling with ±1°C accuracy, reducing risk of thermal runaway while maximizing performance headroom. |
Use Scenario: Thermal profiling of configurable logic blocks and I/O banks in Xilinx/Intel FPGAs deployed in 5G baseband units. IC Role / Device Role / Timing Role: Dual remote inputs track temperature gradients across FPGA die; local sensor validates on-die thermal sensor correlation. Use Value: Supports adaptive voltage/frequency scaling (AVFS) with sub-degree resolution, improving power efficiency without derating. |
| Server Blade Thermal Management | Central Office Telecom Equipment |
|
Use Scenario: Multi-point thermal supervision in 1U rack-mounted server blades with dual CPUs and memory risers. IC Role / Device Role / Timing Role: One TMP442ADCNT per blade monitors CPU1, CPU2, and DIMM slot temperature via discrete diodes. Use Value: Reduces component count vs. using two single-channel sensors; SMBus address flexibility allows daisy-chaining across 16+ blades. |
Use Scenario: Temperature regulation in carrier-grade DSLAMs and optical line terminals operating in uncontrolled central office environments. IC Role / Device Role / Timing Role: Monitors power amplifier stages, laser drivers, and ASIC junctions using ruggedized diode sensors. Use Value: Maintains ±1°C accuracy across –40°C to +70°C ambient swings, ensuring reliable fan control and alarm triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel remote temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6642AESA+ | Single remote + local; no beta compensation; 11-bit resolution; SO-8 package | Limited to one remote zone; lacks auto-compensation for low-beta transistors used in older processors | Select when only one remote sensor is needed and cost sensitivity outweighs accuracy requirements. |
| LM95235CIMMX | Dual remote + local; no automatic beta compensation; 10-bit resolution; supports SMBus alert response | Requires manual β tuning per board; lower resolution reduces thermal margining precision in high-density designs | Prefer where SMBus Alert functionality is mandatory and thermal accuracy tolerance exceeds ±1.5°C. |
Compared with MAX6642AESA+ and LM95235CIMMX, the TMP442ADCNT uniquely delivers dual remote sensing with automatic beta compensation and ±1°C accuracy without calibration - critical for maintaining thermal safety margins in modern multi-core processors and FPGAs.
Availability
TMP442ADCNT is available at Aetrix Electronics and suitable for server thermal management, telecom equipment cooling, and FPGA-based industrial controllers requiring stable component supply across extended product lifecycles.
Supply support for TMP442ADCNT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TMP442ADCNT belongs to TI's precision temperature sensor product line, engineered specifically for high-accuracy, multi-point thermal monitoring in computing and infrastructure systems where junction-level thermal awareness directly impacts reliability and performance.
FAQ
What is the remote temperature accuracy specification for TMP442ADCNT?
The TMP442ADCNT achieves ±1°C maximum remote temperature error over 0°C to +100°C ambient and –40°C to +150°C remote diode temperature range, with no calibration required. This accuracy holds across multiple IC manufacturers' transistors and diodes due to automatic beta compensation and η-factor correction - a key differentiator versus competing dual-channel sensors like the LM95235CIMMX.
Does TMP442ADCNT support two independent remote temperature channels simultaneously?
Yes, TMP442ADCNT integrates two fully independent remote sensing channels (DXP1/DXN1 and DXP2/DXN2), each capable of measuring junction temperature from discrete PNP/NPN transistors or diodes. Both channels operate concurrently with separate configuration registers and temperature result registers (01h and 02h), enabling true simultaneous monitoring of CPU and GPU, or ASIC and memory controller, without time-division multiplexing.
What SMBus addresses does TMP442ADCNT support?
The TMP442ADCNT is available in two factory-configured variants: TMP442A (SMBus address 100 1100b = 0x4C) and TMP442B (SMBus address 100 1101b = 0x4D). These fixed addresses allow multiple TMP442ADCNT devices to coexist on the same SMBus without address collision - essential for dense server blade or telecom chassis designs requiring per-module thermal telemetry.
How does TMP442ADCNT handle series resistance in remote sensor traces?
TMP442ADCNT cancels up to 300 Ω of series resistance on remote sensor lines when beta compensation is enabled (RC = 1), and up to 1 kΩ when disabled (RC = 0). This cancellation occurs automatically during each conversion cycle and eliminates temperature offset caused by PCB trace resistance - a common source of error in long-run thermal sensor layouts used in telecom backplanes and server motherboards.
What is the conversion time for TMP442ADCNT with beta compensation enabled?
With beta compensation enabled (RC = 1), TMP442ADCNT requires 97–137 ms per remote channel conversion, depending on configuration. Local channel conversion takes 12–17 ms. These values are confirmed in the Electrical Characteristics table under "Conversion Time (per channel)" and reflect worst-case timing at full accuracy - critical for designing thermal polling intervals in real-time control loops.
TMP442ADCNT 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
TMP442ADCNT FAQ
1.How can I place an order for TMP442ADCNT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP442ADCNT 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 TMP442ADCNT reliable?
The price and inventory of TMP442ADCNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP442ADCNT is usually 5 days.
3.What payment methods are accepted for TMP442ADCNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP442ADCNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP442ADCNT?
TMP442ADCNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP442ADCNT 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 TMP442ADCNT?
For technical support, including TMP442ADCNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP442ADCNT requirements.
6.How does Aetrix verify that TMP442ADCNT is sourced from the original manufacturer or authorized distributors?
All TMP442ADCNT 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 TMP442ADCNT meets industry standards.
7.What is the process for return or replacement of TMP442ADCNT?
All TMP442ADCNT units undergo pre-shipment inspection (PSI). If there is an issue with TMP442ADCNT, 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 TMP442ADCNT part is unused and in its original packaging.
Return procedure for TMP442ADCNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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