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Texas Instruments TMP422AMDCNTEP
- Part No.:
- TMP422AMDCNTEP
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-8
- Datasheet:
-
TMP422AMDCNTEP.pdf
- Description:
- SENSOR DIGITAL -40C-125C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:414
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Product details
Overview
TMP422AMDCNTEP from Texas Instruments is a precision dual-remote + local temperature sensor IC in SOT23-8 package, supporting ±1°C remote and ±2.5°C local accuracy over –55°C to +125°C. It integrates two independent remote diode channels (DX1/DX2 and DX3/DX4), one local sensor, SMBus 2.0 interface, series resistance cancellation up to 3 kΩ, and n-factor correction - deployed for thermal monitoring of FPGAs, processors, and telecom equipment.
For engineers reviewing the TMP422AMDCNTEP datasheet, TMP422AMDCNTEP pinout, TMP422AMDCNTEP application, or TMP422AMDCNTEP equivalent, this page delivers verified electrical specs, validated pin functions, confirmed military-grade operating range (–55°C to +125°C), real-world SMBus timing constraints (3.4 MHz max clock, 25–35 ms timeout), and precise remote/local resolution (0.0625°C) - all extracted from TI's SBOS577 production data sheet.
Technical Context
The TMP422AMDCNTEP implements a dual-diode current-source architecture with programmable excitation currents (6–120 μA) and differential VBE measurement to compute remote junction temperatures. Its internal ADC provides 12-bit resolution per channel with 0.0625°C LSB granularity for both high- and low-byte registers.
It features hardware-based series resistance cancellation using sequential current forcing on each remote pair (DX1/DX2 and DX3/DX4), enabling accurate readings despite PCB trace resistance up to 3 kΩ. The device supports extended binary format (–55°C to +150°C) via RANGE bit configuration and includes diode fault detection, SMBus timeout recovery, and shutdown mode with 3–10 μA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C max (–55°C to +125°C, TD = –55°C to +125°C, VS = 3.3V); enables direct thermal margining without calibration. |
| Local Accuracy | ±2.5°C max (–55°C to +125°C); sufficient for die-temperature tracking of host ICs in harsh environments. |
| Supply Range | 2.7 V to 5.5 V; compatible with 3.3 V and 5 V logic rails; UVLO at 2.3–2.6 V prevents erratic operation during brownout. |
| Resolution | 0.0625°C (12-bit, two-byte output); allows fine-grained thermal trending and closed-loop fan control. |
| SMBus Speed | Up to 3.4 MHz clock; supports fast polling in high-density server thermal management systems. |
| Quiescent Current | 32–38 μA at 0.0625 conversions/sec; enables ultra-low-power monitoring in always-on subsystems. |
| Thermal Range | –55°C to +125°C ambient; qualified for defense/aerospace applications with controlled baseline and traceability. |
Pinout & Package
SOT23-8 package (DCN designation), 2.9 mm × 1.6 mm × 1.0 mm body, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DX1) | Channel 1 remote diode anode/cathode connection | Paired with DX2; sets SMBus address bits A2/A1; requires external NPN/PNP transistor or diode. |
| 2 (DX2) | Channel 1 remote diode complementary terminal | Completes first remote sensing path; enables series resistance cancellation with DX1. |
| 3 (DX3) | Channel 2 remote diode anode/cathode connection | Paired with DX4; sets SMBus address bit A0; supports second independent remote zone. |
| 4 (DX4) | Channel 2 remote diode complementary terminal | Completes second remote sensing path; enables independent thermal monitoring of dual ICs. |
| 5 (GND) | Analog/digital ground reference | Single ground pin; must be connected to low-impedance system ground plane to minimize noise coupling. |
| 6 (SDA) | SMBus serial data line (open-drain) | Requires external pull-up to V+; supports write byte, read byte, send byte, and receive byte commands. |
| 7 (SCL) | SMBus serial clock line (open-drain) | Requires external pull-up to V+; 3.4 MHz max frequency; 25–35 ms timeout prevents bus lockup. |
| 8 (V+) | Positive supply input | Accepts 2.7–5.5 V; bypass with 0.1 μF ceramic capacitor recommended per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Series Resistance Cancellation | Hardware compensation for up to 3 kΩtrace resistance on remote diode lines - eliminates manual offset calibration. |
| n-Factor Correction | Programmable ideality factor (η = 1.008 default) per remote channel to match transistor/diode non-ideality. |
| Diode Fault Detection | Automatic open/short detection on DX1–DX4; flags faults in Status Register BUSY bit and OPEN flag. |
| Extended Temperature Format | Configurable RANGE bit enables –55°C to +150°C measurement range with unsigned extended binary encoding. |
| Military-Qualified Packaging | SOT23-8 with controlled baseline, single assembly/test/fabrication site, and full product traceability per V62/11618-01XE. |
Applications
| Processor/FPGA Thermal Monitoring | Central Office Telecom Equipment |
|---|---|
|
Use Scenario: Real-time junction temperature tracking of high-power FPGAs and multi-core processors in air-cooled rack systems. IC Role / Device Role / Timing Role: Local sensor measures die temperature; remote channels monitor VRM MOSFETs and memory controller junctions via integrated transistors. Use Value: Enables dynamic throttling and fan speed control with ±1°C remote accuracy - critical for maintaining reliability within ASHRAE Class A2 envelope. |
Use Scenario: Multi-zone thermal supervision across line cards, power supplies, and backplane interfaces in carrier-grade switches. IC Role / Device Role / Timing Role: Dual remote channels track temperature gradients across ASICs and optical modules; SMBus allows daisy-chaining across 16+ devices. Use Value: Supports IEEE 1680.2 thermal compliance reporting with 0.0625°C resolution and guaranteed –55°C startup capability. |
| Storage Area Networks (SAN) | LCD/DLP® Projector Systems |
|
Use Scenario: Hot-spot detection on NVMe SSD controllers and RAID ASICs in dense 2U storage enclosures. IC Role / Device Role / Timing Role: Remote channels interface with on-die transistors of storage controllers; local sensor monitors ambient near cooling fans. Use Value: Prevents thermal runaway during sustained I/O bursts by triggering early warning at <1°C deviation from setpoint. |
Use Scenario: Lamp and DMD array thermal regulation in high-brightness projection systems requiring stable color gamut. IC Role / Device Role / Timing Role: Local sensor tracks projector chassis temperature; remote channels monitor LED driver ICs and DMD controller junctions. Use Value: Maintains luminance stability by feeding 0.0625°C-resolution data to closed-loop thermal compensation firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote/local temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP451RTER | Higher remote accuracy (±0.75°C), integrated EEPROM for n-factor storage, same SOT23-8 package. | Supports factory-programmed calibration; better suited for volume production where per-unit trimming is impractical. | Select TMP451RTER when tighter remote tolerance and persistent configuration are required; not drop-in due to different register map. |
| LM95235CIMMX/NOPB | Two remote + one local channel, SPI interface only, ±1.5°C remote accuracy, MSOP-8 package. | Lacks SMBus compatibility and series resistance cancellation; requires external SPI master and separate fault handling. | Choose LM95235CIMMX/NOPB only if SPI is mandated and SMBus is unavailable; board redesign needed for MSOP-8 footprint. |
Compared with TMP422AMDCNTEP, TMP451RTER improves remote accuracy and adds nonvolatile configuration but requires firmware adaptation; LM95235CIMMX/NOPB offers SPI flexibility at the cost of reduced accuracy, no resistance cancellation, and incompatible interface - making TMP422AMDCNTEP optimal for SMBus-based defense/aerospace thermal systems demanding proven ±1°C performance and military traceability.
Availability
TMP422AMDCNTEP is available at Aetrix Electronics and suitable for processor/FPGA thermal monitoring, central office telecom equipment, and storage area networks requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TMP422AMDCNTEP 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 high-reliability components for industrial, aerospace, and automotive markets.
The TMP422AMDCNTEP belongs to TI's EP (Enhanced Product) family - engineered for defense, aerospace, and medical applications with extended temperature operation, controlled manufacturing baselines, and full traceability.
FAQ
What is the maximum remote temperature measurement range supported by the TMP422AMDCNTEP?
The TMP422AMDCNTEP supports a standard remote measurement range of –55°C to +125°C. When configured via the RANGE bit in Configuration Register 1, it extends to –55°C to +150°C using extended binary format. This extended range is validated per TI's SBOS577 datasheet and applies to both remote channels (DX1/DX2 and DX3/DX4) and the local sensor. The device itself is rated for ambient operation from –55°C to +125°C.
Does the TMP422AMDCNTEP support SMBus timeout recovery, and what is its timeout window?
Yes, the TMP422AMDCNTEP supports SMBus timeout recovery with a fixed timeout window of 25–35 ms, as specified in the Electrical Characteristics table of SBOS577. This feature prevents bus lockup during communication errors and ensures robust operation in noisy telecom or industrial environments. The timeout is hardware-implemented and does not require firmware intervention.
How does series resistance cancellation work on the TMP422AMDCNTEP, and what is its limit?
The TMP422AMDCNTEP performs hardware-based series resistance cancellation by applying two sequential current sources (e.g., 120 μA and 60 μA) to each remote diode pair (DX1/DX2 and DX3/DX4) and computing temperature from the differential VBE. This cancels voltage drops across up to 3 kΩof trace resistance. The cancellation is automatic and requires no user calibration - confirmed in TI's Figure 4 and Figure 5 typical characteristics.
Can the TMP422AMDCNTEP measure temperature with 0.0625°C resolution, and how is it implemented?
Yes, the TMP422AMDCNTEP delivers 0.0625°C resolution for both local and remote channels using a 12-bit ADC with two-byte output: the high byte provides 1°C resolution, and the low byte encodes fractional degrees in 0.0625°C increments (16 steps per degree). This is implemented in hardware and accessible via SMBus reads of registers 00h/10h (local) and 01h/11h (remote 1), as defined in Table 2 and Table 3 of SBOS577.
Is the TMP422AMDCNTEP pin-compatible with other devices in the TMP4xx family, such as the TMP421?
No, the TMP422AMDCNTEP is not pin-compatible with the TMP421. While both use SOT23-8 packages, the TMP421 has only one remote channel (DX1/DX2) and repurposes pins 3 and 4 differently. The TMP422AMDCNTEP uses DX3/DX4 (pins 3/4) for its second remote channel - a functional and pinout distinction confirmed in TI's PIN CONFIGURATION diagram and Table 1 ordering information.
TMP422AMDCNTEP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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, Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±2.5°C)
- Test Condition:
- 15°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-8
TMP422AMDCNTEP FAQ
1.How can I place an order for TMP422AMDCNTEP through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP422AMDCNTEP 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 TMP422AMDCNTEP reliable?
The price and inventory of TMP422AMDCNTEP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP422AMDCNTEP is usually 5 days.
3.What payment methods are accepted for TMP422AMDCNTEP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP422AMDCNTEP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP422AMDCNTEP?
TMP422AMDCNTEP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP422AMDCNTEP 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 TMP422AMDCNTEP?
For technical support, including TMP422AMDCNTEP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP422AMDCNTEP requirements.
6.How does Aetrix verify that TMP422AMDCNTEP is sourced from the original manufacturer or authorized distributors?
All TMP422AMDCNTEP 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 TMP422AMDCNTEP meets industry standards.
7.What is the process for return or replacement of TMP422AMDCNTEP?
All TMP422AMDCNTEP units undergo pre-shipment inspection (PSI). If there is an issue with TMP422AMDCNTEP, 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 TMP422AMDCNTEP part is unused and in its original packaging.
Return procedure for TMP422AMDCNTEP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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