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Texas Instruments TMP126DCKR
- Part No.:
- TMP126DCKR
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TMP126DCKR.pdf
- Description:
- 0.25C SPI TEMPERATURE SENSOR WIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,824
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Product details
Overview
TMP126DCKR from Texas Instruments is a high-accuracy, low-power digital temperature sensor IC with ±0.25°C max error from 20°C to 30°C, 14-bit resolution (0.03125°C/LSB), and extended operation up to 175°C ambient. It features a 3-wire SPI interface, programmable temperature alert limits, slew rate warning, and optional CRC for data integrity - deployed in avionics thermal monitoring, servo drive protection, and grid infrastructure sensing.
For engineers reviewing the TMP126DCKR datasheet, TMP126DCKR pinout, TMP126DCKR application, or TMP126DCKR equivalent, key selection considerations include its NIST-traceable factory calibration, –55°C to 175°C operating range, 1.62 V to 5.5 V supply compatibility, and autonomous ALERT output behavior in interrupt or comparator mode.
Technical Context
The TMP126DCKR implements a precision bandgap-based thermal sensing core with integrated 14-bit ADC and digital signal conditioning logic. Its functional block includes an internal oscillator, register bank with configurable alert thresholds, slew limit comparator, and CRC engine supporting 16-bit checksums on read/write transactions.
It operates in three distinct modes - continuous conversion (configurable 31.25 ms to 2 s period), one-shot (auto-shutdown after conversion), and shutdown (350 nA typical) - enabling dynamic power management while maintaining guaranteed accuracy across its full –55°C to 175°C range without self-heating compensation delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±0.25°C max (20–30°C); ±0.5°C max (–55–150°C); ±0.75°C max (150–175°C) - enables closed-loop thermal control in high-reliability systems |
| Resolution | 14-bit signed output (0.03125°C/LSB) - supports fine-grained temperature trending and derivative calculations |
| Supply Range | 1.62 V to 5.5 V - interoperable with 1.8 V, 3.3 V, and 5 V microcontroller I/O domains without level shifting |
| Active Current | 77–160 μA (–55–175°C) - allows continuous monitoring in power-constrained industrial nodes |
| SPI Clock Rate | Up to 10 MHz - supports fast polling in real-time control loops with minimal bus overhead |
| Response Time | 0.6 s (63% in stirred liquid, flex PCB) - enables rapid detection of thermal transients in motor windings or laser diodes |
| ESD Rating | HBM ±2000 V, CDM ±750 V - robust against handling and board-level ESD in factory automation environments |
Pinout & Package
SOT-SC70 (6-pin) package: 2.00 mm × 1.25 mm footprint, optimized for placement near heat sources with minimal thermal mass and fast PCB coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Input | Chip select active-low; initiates SPI frame and enables SIO bidirectional communication |
| 2 - GND | Power | Analog/digital ground reference; must be connected to low-impedance system ground plane |
| 3 - SIO | I/O | Bidirectional data line; carries command words, register reads/writes, and CRC checksums |
| 4 - SCLK | Input | System clock input; synchronous edge-triggered at up to 10 MHz for deterministic timing |
| 5 - ALERT | I/O (open-drain) | Configurable alert output; asserts on temperature limit breach or slew rate violation; requires external pull-up |
| 6 - VDD | Power | Single-supply input (1.62–5.5 V); powers analog sensor core, digital logic, and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| NIST-traceable calibration | Factory-trimmed accuracy verified per ISO/IEC 17025-accredited lab standards - eliminates field calibration effort |
| Programmable slew rate warning | Detects rapid temperature rise (e.g., motor stall or short-circuit fault) before reaching critical thresholds - enables predictive thermal mitigation |
| Optional 16-bit CRC | Validates SPI data integrity on both read and write cycles - prevents undetected corruption in noisy industrial buses |
| Autonomous ALERT output | Configurable as interrupt or comparator mode - offloads host MCU by signaling thermal events without polling |
| Fast conversion with no self-heating delay | Accurate readings at ≥31.25 ms intervals - avoids mandatory cooldown waits common in lower-power sensors |
Applications
| Avionics Thermal Monitoring | Servo Drive Protection |
|---|---|
|
Use Scenario: Real-time temperature tracking of flight control actuators and power electronics in unmanned aerial vehicles. IC Role / Device Role / Timing Role: Primary ambient and junction temperature sensor feeding safety-critical thermal shutdown logic. Use Value: ±0.25°C accuracy at 25°C and 175°C operation enable compliance with DO-160 environmental test profiles and prevent false trips during rapid thermal transients. |
Use Scenario: Monitoring IGBT heatsink temperature in industrial servo inverters to prevent overtemperature derating. IC Role / Device Role / Timing Role: High-speed thermal watchdog with slew rate alert detecting sudden current surges before thermal runaway. Use Value: 0.6 s liquid response time and programmable slew limit allow early intervention - extending component lifetime and avoiding forced shutdowns. |
| Grid Infrastructure Sensing | Laser Diode Thermal Control |
|
Use Scenario: Ambient temperature measurement inside outdoor substation RTUs exposed to desert or arctic conditions. IC Role / Device Role / Timing Role: Long-term stable reference sensor for compensating metering IC drift and relay trip thresholds. Use Value: 0.07°C long-term drift after 1000 h at 175°C ensures calibration stability over 10+ year deployments without recalibration. |
Use Scenario: Closed-loop temperature stabilization of fiber-coupled pump lasers in optical transceivers. IC Role / Device Role / Timing Role: Precision feedback element in PID loop controlling TEC voltage to maintain wavelength stability. Use Value: 0.03125°C/LSB resolution and ±0.5°C accuracy from –40°C to 125°C support <±0.1 nm wavelength lock in DWDM systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-temperature digital temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31875RASD+ | ±0.25°C accuracy only to +125°C; no slew rate warning; I²C-only interface; 1.7–3.6 V supply | Limited to industrial controls below 125°C; lacks autonomous thermal transient detection | Select when I²C bus is preferred and 175°C operation is unnecessary |
| ADT7420TRZ-REEL7 | ±0.25°C to +105°C; 16-bit resolution; I²C/SMBus; 2.7–5.5 V; no CRC or slew rate alert | Suitable for lab equipment or medical devices but not avionics-grade thermal protection | Choose for higher resolution where extended temperature range and fault detection are secondary |
Compared with MAX31875RASD+ and ADT7420TRZ-REEL7, the TMP126DCKR uniquely combines 175°C operation, slew rate warning, and SPI/CRC support - making it the only option for safety-critical thermal event prediction in harsh-environment embedded systems.
Availability
TMP126DCKR is available at Aetrix Electronics and suitable for avionics thermal monitoring, servo drive protection, and grid infrastructure sensing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TMP126DCKR 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 automotive and industrial qualification expertise.
The TMP126 product line delivers ultra-high-accuracy, extended-range temperature sensing for mission-critical thermal management - designed specifically for aerospace, energy, and motion control applications demanding reliability beyond standard commercial grades.
FAQ
What is the maximum operating temperature of the TMP126DCKR?
The TMP126DCKR supports continuous operation from –55°C to +175°C ambient temperature, validated per HTOL testing at 175°C for 1410 hours. This exceeds standard industrial grade and meets requirements for under-hood automotive, downhole oil/gas, and high-power converter applications where conventional sensors fail.
Does the TMP126DCKR require external calibration?
No - the TMP126DCKR is factory-calibrated with NIST-traceable equipment per ISO/IEC 17025 standards. Its ±0.25°C accuracy from 20°C to 30°C and guaranteed error bands across the full –55°C to 175°C range eliminate need for end-user calibration, reducing test time and BOM cost in production.
How does the slew rate warning function in the TMP126DCKR?
The TMP126DCKR monitors the difference between consecutive temperature readings and compares it to a user-programmable Slew_Limit register value. If exceeded, it sets the Slew_Flag in Alert_Status and asserts the ALERT pin - enabling early detection of thermal faults like short circuits or cooling failures before reaching absolute limits.
Can the TMP126DCKR operate from a 1.8 V supply?
Yes - the TMP126DCKR supports 1.62 V to 5.5 V supply voltage, including standard 1.8 V logic rails. At 1.8 V, it maintains full functionality: 10 MHz SPI, ±0.5°C accuracy from –55°C to 150°C, and 1 μA average current in 1 Hz continuous mode - ideal for battery-backed industrial IoT nodes.
Is the TMP126DCKR pin-compatible with other members of the TMP126 family?
Yes - the TMP126DCKR shares identical SOT-SC70 (DCK) pinout and register map with TMP126N and TMP126-Q1 variants. However, accuracy specs differ: TMP126N offers ±0.8°C from –40°C to 150°C, while TMP126-Q1 adds AEC-Q100 Grade-0 qualification - all use same PCB layout and firmware interface.
TMP126DCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -55°C ~ 175°C
- Sensing Temperature - Remote:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 1.62V ~ 5.5V
- Resolution:
- 14 b
- Features:
- One-Shot, Shutdown Mode, Sleep Mode
- Accuracy - Highest (Lowest):
- ±0.3°C (±1°C)
- Test Condition:
- -20°C ~ 85°C (-55°C ~ 175°C)
- Operating Temperature:
- -55°C ~ 175°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SC-70-6
TMP126DCKR FAQ
1.How can I place an order for TMP126DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP126DCKR 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 TMP126DCKR reliable?
The price and inventory of TMP126DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP126DCKR is usually 5 days.
3.What payment methods are accepted for TMP126DCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP126DCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP126DCKR?
TMP126DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP126DCKR 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 TMP126DCKR?
For technical support, including TMP126DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP126DCKR requirements.
6.How does Aetrix verify that TMP126DCKR is sourced from the original manufacturer or authorized distributors?
All TMP126DCKR 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 TMP126DCKR meets industry standards.
7.What is the process for return or replacement of TMP126DCKR?
All TMP126DCKR units undergo pre-shipment inspection (PSI). If there is an issue with TMP126DCKR, 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 TMP126DCKR part is unused and in its original packaging.
Return procedure for TMP126DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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