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Texas Instruments TMP126EDBVRQ1
- Part No.:
- TMP126EDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-6
- Datasheet:
-
TMP126EDBVRQ1.pdf
- Description:
- AUTOMOTIVE 0.25C SPI TEMPERATURE
- Quantity:
- Payment:
- Shipping:
Inventory:2,613
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Product details
Overview
TMP126EDBVRQ1 from Texas Instruments is an AEC-Q100 Grade-0 automotive-grade digital temperature sensor with ±0.25°C max accuracy from 20°C to 30°C, 14-bit resolution (0.03125°C/LSB), and 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 transmission control units and traction inverters where thermal reliability is critical.
For engineers reviewing the TMP126EDBVRQ1 datasheet, TMP126EDBVRQ1 pinout, TMP126EDBVRQ1 application, or TMP126EDBVRQ1 equivalent, key selection criteria include its NIST-traceable factory calibration, -55°C to 175°C operating range, low-power active/standby/shutdown modes, and integrated slew rate detection for early thermal anomaly response in harsh automotive environments.
Technical Context
The TMP126EDBVRQ1 implements a precision bandgap-based thermal sensing core with 14-bit ADC conversion and on-chip digital signal processing. Its functional block includes dedicated registers for high/low temperature limits, slew rate threshold (Slew_Limit), and alert status flags, all accessible via SPI read/write operations.
It supports three operational modes - continuous conversion (configurable period), one-shot (auto-shutdown after measurement), and shutdown (350 nA typical) - with Data_Ready flag synchronization and ALERT pin configurable as interrupt or comparator output. CRC validation applies to both read and write transactions, excluding configuration register writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±0.25°C max (20–30°C); ±0.5°C max (−55–150°C); enables precise thermal margining in powertrain systems |
| Resolution | 14-bit signed (0.03125°C/LSB); supports fine-grained temperature trending for predictive thermal management |
| Supply Range | 1.62 V to 5.5 V; compatible with 1.8 V, 3.3 V, and 5 V automotive subsystems without level shifting |
| Active Current | 77–160 μA (−55–175°C); allows frequent measurements in battery-sensitive modules like OBCs |
| Standby Current | 0.5–34 μA (−55–175°C); sustains background monitoring with minimal power penalty |
| SPI Speed | Up to 10 MHz; enables fast register access and high-throughput thermal logging in real-time control loops |
| Response Time | 0.8 s (63%, DBV on flex PCB); ensures timely detection of rapid thermal transients near heat sources |
Pinout & Package
The TMP126EDBVRQ1 is packaged in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for surface-mount placement adjacent to high-temperature components such as IGBTs and DC/DC converters.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low SPI enable; must be held low during full transaction to prevent bus contention |
| GND | Ground Reference | Primary return path for analog and digital circuitry; requires low-impedance connection to minimize noise coupling |
| SIO | Serial I/O Bidirectional | Half-duplex SPI data line; shares physical trace with SCLK for compact routing in space-constrained layouts |
| SCLK | Serial Clock Input | Master-generated clock up to 10 MHz; timing-critical for CRC validation and register read/write integrity |
| ALERT | Open-Drain Alert Output | Configurable as interrupt or comparator; pulls low on limit/slew violations; requires external pull-up for system wake-up signaling |
| VDD | Power Supply Input | Accepts 1.62–5.5 V; internal POR resets device at 1.3 V rising edge and detects brownout at 1.1 V falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Temperature Slew Rate Warning | Monitors ΔT/Δt between consecutive conversions in continuous mode; triggers ALERT before crossing absolute thermal limits - enabling proactive derating in inverters |
| Programmable Alert Limits | Independent high/low thresholds stored in dedicated registers; allows autonomous thermal supervision without MCU polling overhead |
| Optional CRC Validation | 16-bit checksum appended to SPI reads and verified on writes; prevents undetected corruption in noisy automotive CAN/FlexRay environments |
| NIST-Traceable Calibration | Factory-trimmed against ISO/IEC 17025-accredited standards; eliminates field calibration effort and ensures long-term accuracy compliance |
| AEC-Q100 Grade-0 Qualification | Validated for −55°C to +175°C ambient operation with HBM Class 2 and CDM Class C2b ESD robustness - suitable for under-hood deployment |
Applications
| Transmission Control Units | On-board Chargers (OBC) |
|---|---|
Use Scenario: Real-time monitoring of gearbox oil and clutch pack temperatures during aggressive shifting cycles. IC Role / Device Role / Timing Role: Primary temperature sensor feeding closed-loop torque management and shift timing algorithms. Use Value: ±0.25°C accuracy at 25°C enables tighter thermal safety margins, reducing unnecessary down-rating and improving drivability. | Use Scenario: Thermal supervision of SiC MOSFETs and isolation transformers during high-power AC-to-DC conversion. IC Role / Device Role / Timing Role: High-speed thermal sentinel triggering slew-rate alerts to preempt thermal runaway before gate driver shutdown. Use Value: 0.8 s liquid response time and 10 MHz SPI allow sub-second reaction to rapid junction temperature rise in 22 kW+ OBCs. |
| Brake Systems | Traction Inverters |
Use Scenario: Monitoring caliper carrier and brake fluid reservoir temperatures during repeated high-G braking events. IC Role / Device Role / Timing Role: Safety-critical temperature node interfacing with ABS/ESC controllers via SPI-isolated link. Use Value: AEC-Q100 Grade-0 rating and 175°C operation ensure reliable function during sustained friction heating beyond 150°C. | Use Scenario: Direct mounting on IGBT module baseplate to track coolant inlet/outlet and heatsink thermal gradients. IC Role / Device Role / Timing Role: Distributed thermal node feeding inverter control unit with real-time temperature deltas for dynamic current derating. Use Value: Programmable alert limits and slew rate warning reduce reliance on centralized thermal models, improving fault response latency by >300 ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM70CIMM/NOPB | 0.5°C max accuracy (−40–125°C); no slew rate warning; no automotive qualification; 8-pin VSSOP | Limited to under-dash infotainment or body control modules; not suitable for powertrain or safety-critical use | Select only for cost-sensitive non-automotive industrial applications requiring basic SPI temperature readout |
| MAX31820MUA+ | 1-Wire interface; ±0.5°C accuracy; no CRC; 8-pin μMAX; no AEC-Q100 rating | Designed for distributed sensor networks with daisy-chain wiring; lacks real-time alerting features for fast thermal events | Prefer when wiring simplicity outweighs need for deterministic timing, CRC, or automotive reliability |
Compared with LM70CIMM/NOPB and MAX31820MUA+, the TMP126EDBVRQ1 delivers superior thermal accuracy across extended temperature ranges, integrated slew rate detection for predictive thermal protection, and AEC-Q100 Grade-0 qualification - making it the only option qualified for direct placement on traction inverter power stages.
Availability
TMP126EDBVRQ1 is available at Aetrix Electronics and suitable for transmission control units, on-board chargers, and traction inverters requiring stable component supply across automotive production lifecycles.
Supply support for TMP126EDBVRQ1 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 ICs for automotive, industrial, and communications markets.
The TMP126-Q1 product line was engineered specifically for automotive thermal management in extreme environments - delivering high-accuracy, low-power, and functionally safe temperature sensing for powertrain, charging, and braking systems.
FAQ
What is the maximum ambient operating temperature supported by the TMP126EDBVRQ1?
The TMP126EDBVRQ1 supports an ambient operating temperature range of −55°C to +175°C, validated per AEC-Q100 Grade-0 requirements. This rating applies to the DBV (SOT-23) package variant and enables direct mounting on high-heat components such as IGBT modules and DC/DC converter inductors. Operation at 175°C is confirmed through HTOL testing for 1410 hours.
Does the TMP126EDBVRQ1 support CRC for both read and write SPI transactions?
Yes, the TMP126EDBVRQ1 supports optional 16-bit CRC validation on both read and write SPI transactions. During reads, the device appends the CRC to the data block; during writes, the host supplies the CRC word for internal verification. If mismatched, the TMP126EDBVRQ1 discards the write and sets the CRC_Flag in the Alert_Status register. Note that CRC-enabled writes to the configuration register are not supported.
How does the slew rate warning feature work in the TMP126EDBVRQ1?
The TMP126EDBVRQ1 monitors the temperature change between consecutive conversions in continuous mode and compares it against the user-programmed Slew_Limit register value. When the positive ΔT exceeds this limit, the Slew_Flag bit is set and the ALERT pin asserts if enabled. This feature operates only in continuous mode, requires fixed conversion periods, and is designed to detect rapid thermal transients before reaching absolute thermal limits - critical for inverter overtemperature prevention.
What are the power consumption characteristics of the TMP126EDBVRQ1 in different operating modes?
In active conversion, the TMP126EDBVRQ1 draws 77–160 μA depending on temperature; in standby (between conversions), it consumes 0.5–34 μA; and in shutdown mode, it draws just 350 nA typical. These values are specified across the full −55°C to +175°C range. The device's low quiescent current and fast wake-up (<0.5 ms reset time) make it suitable for battery-backed systems and intermittent thermal monitoring in EV power distribution units.
Is the TMP126EDBVRQ1 pin-compatible with other members of the TMP126 family?
The TMP126EDBVRQ1 uses the DBV (SOT-23-6) package and shares identical pinout and functionality with the TMP126NDBVR and TMP126DBVR variants. However, it is not pin-compatible with the DCK (SC70-6) package variants due to differing mechanical dimensions and thermal pad layout - though electrical interface and register mapping remain consistent across all TMP126-Q1 variants.
TMP126EDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital
- Sensing Temperature - Local:
- -55°C ~ 150°C
- Sensing Temperature - Remote:
- -
- Output Type:
- 3-Wire Serial, SPI
- Voltage - Supply:
- 1.62V ~ 5.5V
- Resolution:
- 14 b
- Features:
- One-Shot, Programmable Limit, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±0.25°C (±0.75°C)
- Test Condition:
- 20°C ~ 30°C (150°C ~ 175°C)
- Operating Temperature:
- -55°C ~ 175°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-6
TMP126EDBVRQ1 FAQ
1.How can I place an order for TMP126EDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP126EDBVRQ1 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 TMP126EDBVRQ1 reliable?
The price and inventory of TMP126EDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP126EDBVRQ1 is usually 5 days.
3.What payment methods are accepted for TMP126EDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP126EDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP126EDBVRQ1?
TMP126EDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP126EDBVRQ1 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 TMP126EDBVRQ1?
For technical support, including TMP126EDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP126EDBVRQ1 requirements.
6.How does Aetrix verify that TMP126EDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TMP126EDBVRQ1 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 TMP126EDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TMP126EDBVRQ1?
All TMP126EDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP126EDBVRQ1, 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 TMP126EDBVRQ1 part is unused and in its original packaging.
Return procedure for TMP126EDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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