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Texas Instruments TMP422AQDCNTQ1
- Part No.:
- TMP422AQDCNTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-8
- Datasheet:
-
TMP422AQDCNTQ1.pdf
- Description:
- SENSOR DIGITAL -40C-127C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,836
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Product details
Overview
TMP422AQDCNTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified dual-channel remote and local digital temperature sensor IC in SOT-23-8 package, delivering ±1°C remote diode accuracy (–40°C to +150°C) and ±1.5°C local die accuracy (–40°C to +125°C) via SMBus/I²C interface with programmable n-factor correction and series resistance cancellation up to 3 kΩ - used for real-time junction temperature monitoring of processors and FPGAs in engine control units.
For engineers reviewing the TMP422AQDCNTQ1 datasheet, TMP422AQDCNTQ1 pinout, TMP422AQDCNTQ1 application, or TMP422AQDCNTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed remote sensing architecture, exact thermal error behavior across voltage and series resistance, and two rigorously cross-checked alternative parts for automotive thermal management designs.
Technical Context
The TMP422AQDCNTQ1 implements a dual-channel remote sensing architecture using four dedicated analog inputs (DX1–DX4) to measure two independent external diode-connected transistors, each requiring matched positive/negative pairs; it supports SMBus Fast-Mode (up to 400 kHz) and High-Speed Mode (up to 3.4 MHz) with integrated spike suppression filters and Schmitt-triggered SCL/SDA inputs.
It features on-chip series resistance cancellation (up to 3 kΩ), programmable ideality factor (η = 1.008), differential input capacitance tolerance up to 1000 pF, and built-in 65-kHz input filtering - all operating within a 2.7 V to 5.5 V supply range while maintaining AEC-Q100 Grade 1 ambient temperature compliance (–40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C max over –40°C to +150°C; enables direct junction temp readout without calibration for automotive SoCs |
| Local Accuracy | ±1.5°C max over –40°C to +125°C; provides precise die temperature tracking for thermal throttling decisions |
| Supply Range | 2.7 V to 5.5 V; compatible with 3.3 V and 5 V automotive power domains without level-shifting |
| Interface | SMBus/I²C with open-drain SCL/SDA; supports Fast-Mode (400 kHz) and High-Speed Mode (3.4 MHz) |
| Conversion Time | 100–130 ms per channel; deterministic timing for synchronized multi-sensor polling in safety-critical systems |
| Quiescent Current | 32–525 μA depending on conversion rate; <10 μA in shutdown mode for low-power wake-on-temp applications |
| ESD Rating | HBM ±3000 V, CDM ±750 V; meets AEC-Q100 stress requirements for under-hood deployment |
Pinout & Package
Package: SOT-23-8 (2.90 mm × 1.63 mm), surface-mount, RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DX1 | Analog input | Positive terminal for Channel 1 remote diode; also sets device address bit A1 when pulled high/low |
| 2 - DX2 | Analog input | Negative terminal for Channel 1 remote diode; also sets device address bit A0 when pulled high/low |
| 3 - DX3 | Analog input | Positive terminal for Channel 2 remote diode; unused pins must be tied to GND |
| 4 - DX4 | Analog input | Negative terminal for Channel 2 remote diode; unused pins must be tied to GND |
| 5 - GND | Ground | System reference return path; requires low-impedance PCB connection to minimize thermal measurement offset |
| 6 - SDA | Bidirectional I/O | SMBus data line; open-drain output requiring external pull-up to V+; supports ACK/NACK handshake |
| 7 - SCL | Digital input | SMBus clock line; open-drain input requiring external pull-up to V+; tolerates bus noise via Schmitt trigger |
| 8 - V+ | Power supply | Primary supply input (2.7–5.5 V); powers internal ADC, oscillator, and register bank; includes UVLO at 2.45 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual remote + local sensing | Simultaneous measurement of two external diodes plus internal die temperature - eliminates need for multiple discrete sensors in ECU thermal stacks |
| Series resistance cancellation | Compensates up to 3 kΩPCB trace resistance automatically - removes calibration burden for long-sensor routing in chassis-mounted modules |
| Programmable n-factor | Fixed η = 1.008 optimized for standard PNP/NPN transistors - ensures accurate remote junction readings across process variations |
| Diode fault detection | Identifies open-circuit, short-circuit (–64°C), and reverse-bias faults - prevents erroneous thermal shutdown commands in safety-critical firmware |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±3000 V, CDM ±750 V - certified for powertrain and ADAS module integration |
Applications
| Processor Thermal Monitoring | FPGA Junction Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking of automotive-grade microcontrollers during active torque calculation cycles. IC Role / Device Role / Timing Role: Local sensor measures MCU die temperature; remote channels monitor external transistor junctions embedded in power management ASICs. Use Value: Enables dynamic frequency scaling and thermal throttling with ±1.5°C local and ±1°C remote accuracy - critical for ISO 26262 ASIL-B thermal safety compliance. |
Use Scenario: Monitoring temperature gradients across FPGA banks in ADAS vision processing units exposed to under-hood ambient swings. IC Role / Device Role / Timing Role: Dual remote channels track two spatially separated substrate diodes; local sensor validates on-die thermal model drift. Use Value: Supports closed-loop fan control and hot-spot mitigation with 0.0625°C resolution and 130 ms max conversion time - reduces thermal-induced timing violations. |
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
Use Scenario: Continuous junction temperature supervision of ignition driver transistors and fuel injector drivers in gasoline direct injection systems. IC Role / Device Role / Timing Role: Remote channels interface with discrete NPN/PNP transistors mounted on power stage heatsinks; local sensor monitors ambient PCB temperature near MCU. Use Value: Provides early overtemperature warning with series resistance cancellation - eliminates false alarms caused by trace-length variation across production batches. |
Use Scenario: Thermal protection of solenoid driver ICs and clutch pressure regulators in 8-speed automatic transmissions operating at 125°C ambient. IC Role / Device Role / Timing Role: Dual remote inputs monitor two independent power transistor junctions; SMBus interface allows daisy-chaining with other sensors on same bus. Use Value: Delivers ±1°C remote accuracy over full –40°C to +150°C range - ensures reliable derating before silicon failure limits are reached. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel remote/local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP421AQDCNTQ1 | Single remote channel only; identical local accuracy, SMBus interface, and SOT-23-8 package | Not suitable for dual-junction monitoring; limited to single-processor or single-FPGA thermal zones | Select when only one external diode needs monitoring and board space or BOM count must be minimized |
| LM95235EVAL/NOPB | Two remote + one local channel; SPI interface only; SOIC-8 package; ±1.5°C remote accuracy | Requires SPI host controller instead of SMBus; larger footprint; no AEC-Q100 qualification | Choose for non-automotive industrial systems where SPI is preferred and higher remote error tolerance is acceptable |
Compared with TMP421AQDCNTQ1, the TMP422AQDCNTQ1 adds a second remote channel without increasing package size or supply constraints - enabling tighter thermal zoning in space-constrained ECUs. Versus LM95235EVAL/NOPB, it offers automotive qualification, SMBus compatibility, and superior remote accuracy at the cost of interface flexibility.
Availability
TMP422AQDCNTQ1 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and ADAS domain controllers requiring stable component supply with automotive-grade lifecycle assurance and AEC-Q100 documentation traceability.
Supply support for TMP422AQDCNTQ1 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 automotive, industrial, and communications markets.
The TMP42x-Q1 product line was designed specifically for automotive thermal management - delivering high-accuracy remote junction sensing in compact packages with AEC-Q100 qualification, series resistance immunity, and robust SMBus communication for ECU, TCM, and ADAS subsystems.
FAQ
What is the remote temperature measurement range supported by the TMP422AQDCNTQ1?
The TMP422AQDCNTQ1 supports a remote temperature measurement range of –40°C to +150°C with ±1°C maximum accuracy. When configured for extended range mode (RANGE bit = 1), it can report values from –64°C to +191°C, though practical diode sensing remains limited to –55°C to +150°C. The device's absolute maximum junction temperature is 150°C, and ambient operation is rated from –40°C to +125°C per AEC-Q100 Grade 1.
Does the TMP422AQDCNTQ1 require external calibration for remote diode measurements?
No, the TMP422AQDCNTQ1 does not require external calibration for remote diode measurements. It achieves ±1°C remote accuracy across multiple diode manufacturers without calibration, enabled by on-chip series resistance cancellation (up to 3 kΩ), fixed n-factor correction (η = 1.008), and factory-trimmed ADC references. Calibration is only needed if custom ideality factors or extreme PCB parasitics exceed design limits.
How many remote temperature channels does the TMP422AQDCNTQ1 support, and how are they connected?
The TMP422AQDCNTQ1 supports two independent remote temperature channels. Channel 1 uses pins DX1 (positive) and DX2 (negative); Channel 2 uses pins DX3 (positive) and DX4 (negative). Each channel interfaces with a diode-connected NPN or PNP transistor. Unused DX pins must be tied to GND to prevent fault detection errors - unlike the TMP421-Q1 or TMP423-Q1, which use different pin mapping schemes.
What SMBus/I²C speeds does the TMP422AQDCNTQ1 support, and what are the timing constraints?
The TMP422AQDCNTQ1 supports SMBus Fast-Mode (up to 400 kHz) and High-Speed Mode (up to 3.4 MHz). Minimum SCL clock period is 2.5 µs (Fast-Mode) or 392 ns (High-Speed Mode). Bus free time (tBUF) is 1300 ns minimum in Fast-Mode and 160 ns in High-Speed Mode. Timeout resets the interface if SCL or SDA is held low >30 ms between START and STOP - requiring ≥1 kHz minimum SCL frequency to avoid spurious resets.
Is the TMP422AQDCNTQ1 pin-compatible with other devices in the TMP42x-Q1 family?
No, the TMP422AQDCNTQ1 is not pin-compatible with TMP421AQDCNTQ1 or TMP423AQDCNTQ1. While all three share the SOT-23-8 package and common pins (V+, GND, SCL, SDA), their remote sensing pin assignments differ: TMP421-Q1 uses DXP/DXN; TMP422-Q1 uses DX1–DX4; TMP423-Q1 uses DXP1–DXP3/DXN. Swapping parts requires PCB layout revision due to incompatible analog input routing.
TMP422AQDCNTQ1 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 ~ 127°C
- Sensing Temperature - Remote:
- -40°C ~ 127°C
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 12 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±2.5°C) Local , ±1°C (±5°C) Remote
- Test Condition:
- 15°C ~ 85°C (-40°C ~ 125°C) Local, 15°C ~ 85°C (-40°C ~ 125°C) Remote
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- SOT-23-8
TMP422AQDCNTQ1 FAQ
1.How can I place an order for TMP422AQDCNTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP422AQDCNTQ1 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 TMP422AQDCNTQ1 reliable?
The price and inventory of TMP422AQDCNTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP422AQDCNTQ1 is usually 5 days.
3.What payment methods are accepted for TMP422AQDCNTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP422AQDCNTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP422AQDCNTQ1?
TMP422AQDCNTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP422AQDCNTQ1 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 TMP422AQDCNTQ1?
For technical support, including TMP422AQDCNTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP422AQDCNTQ1 requirements.
6.How does Aetrix verify that TMP422AQDCNTQ1 is sourced from the original manufacturer or authorized distributors?
All TMP422AQDCNTQ1 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 TMP422AQDCNTQ1 meets industry standards.
7.What is the process for return or replacement of TMP422AQDCNTQ1?
All TMP422AQDCNTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP422AQDCNTQ1, 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 TMP422AQDCNTQ1 part is unused and in its original packaging.
Return procedure for TMP422AQDCNTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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