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Texas Instruments TMP125AIDBVRG4
- Part No.:
- TMP125AIDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-6
- Datasheet:
-
TMP125AIDBVRG4.pdf
- Description:
- SENSOR DIGITAL -40C-125C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
TMP125AIDBVRG4 from Texas Instruments is a 10-bit SPI-compatible digital temperature sensor in SOT23-6 package, delivering ±2.0°C accuracy from −25°C to +85°C and ±2.5°C over −40°C to +125°C, with 0.25°C resolution and 50µA max quiescent current - used for thermal protection in notebook computers and telecom equipment.
For engineers reviewing the TMP125AIDBVRG4 datasheet, TMP125AIDBVRG4 pinout, TMP125AIDBVRG4 application, or TMP125AIDBVRG4 equivalent, this page delivers verified electrical specs, real-world thermal use cases, pin-level interface behavior, and validated alternative options for embedded thermal monitoring designs.
Technical Context
The TMP125AIDBVRG4 integrates a ΔΣ A/D converter and on-chip temperature sensing diode, outputting signed two's complement 10-bit data via SPI-compatible serial interface with CS, SCK, SI, and SO signals. It operates without external components except optional 0.1µF bypass capacitor.
It supports hardware shutdown via SI pin (high on third SCK rising edge), achieves 60ms conversion time and 120ms update rate, and maintains 1µA shutdown current over full −40°C to +125°C operating range with 2.7V–5.5V supply compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit output with 0.25°C LSB step - enables precise thermal threshold detection in compact systems. |
| Accuracy | ±2.0°C (−25°C to +85°C), ±2.5°C (−40°C to +125°C) - meets industrial-grade thermal monitoring requirements. |
| Supply Range | 2.7V to 5.5V - interoperable with 3.3V and 5V logic domains without level-shifting. |
| Quiescent Current | 50µA max (active), 1µA (shutdown) - extends battery life in portable thermal protection circuits. |
| Conversion Time | 60ms per measurement - balances speed and power efficiency for periodic thermal sampling. |
| Operating Range | −40°C to +125°C (spec), −55°C to +125°C (operation) - suitable for under-hood automotive and base station environments. |
| Interface | SPI-compatible 4-wire (CS/SCK/SI/SO) - integrates directly with MCU SPI peripherals without protocol translation. |
Pinout & Package
SOT23-6 surface-mount package (DBV), 1.45mm max height, JEDEC MO-178 compliant, with exposed metal pad not electrically connected - optimized for PCB space-constrained thermal sensing nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SI) | Serial Input / Shutdown Control | Active-high shutdown enable; high on third SCK rising edge enters low-power mode. |
| 2 (SCK) | Serial Clock Input | Drives synchronous data transfer; supports ≥10MHz clock (t1 min 100ns period). |
| 3 (CS) | Chip Select Input | Active-low enables readout; latches last conversion result into shift register when pulled low. |
| 4 (GND) | Ground Reference | Primary return path for analog and digital circuitry; connects to system ground plane. |
| 5 (SO) | Serial Output | Tri-state output delivering 16-bit data word (sign bit + 10-bit temp + padding) on falling SCK edge. |
| 6 (V+) | Positive Supply | Accepts 2.7V–5.5V; requires local 0.1µF ceramic bypass capacitor for stable ADC operation. |
Key Features
| Feature | Design Value |
|---|---|
| Self-contained sensing | On-die temperature diode eliminates need for external thermistor or RTD, reducing BOM count and calibration complexity. |
| Hardware shutdown control | SI pin allows deterministic entry/exit from 1µA shutdown state without software overhead or I²C-style address arbitration. |
| One-shot conversion mode | Enables single-triggered measurement followed by automatic shutdown - ideal for event-driven thermal polling. |
| No external components required | Operates stand-alone with only V+, GND, and SPI lines; bypass cap recommended but not mandatory for basic functionality. |
| Lead-free & RoHS-compliant | NiPdAu lead finish, MSL Level-2-260°C-1 year rating - supports automated SMT assembly and environmental compliance. |
Applications
| Base Station Equipment | Notebook Computers |
|---|---|
|
Use Scenario: Real-time junction temperature monitoring of RF power amplifiers and FEM modules in 4G/5G macrocells. IC Role / Device Role / Timing Role: Primary die-temperature sensor feeding thermal throttling logic in baseband processor. Use Value: Enables dynamic RF output power reduction before thermal shutdown, preserving signal integrity and component lifetime. |
Use Scenario: CPU/GPU hotspot detection and fan-speed control in ultra-thin laptop chassis with limited airflow. IC Role / Device Role / Timing Role: Localized thermal node interfacing directly with EC (Embedded Controller) via SPI bus. Use Value: Delivers 0.25°C resolution at 120ms update rate to prevent thermal throttling while minimizing system power draw. |
| Data Acquisition Systems | Office Machines |
|
Use Scenario: Ambient and board-temperature compensation in multi-channel precision ADC front-ends for industrial DAQ modules. IC Role / Device Role / Timing Role: Calibration reference sensor providing real-time offset correction data to FPGA-based signal processing pipeline. Use Value: Compensates for gain drift in analog signal chain across −40°C to +85°C ambient range without recalibration cycles. |
Use Scenario: Thermal cutoff for fuser assemblies and motor drivers in laser printers and multifunction copiers. IC Role / Device Role / Timing Role: Safety-critical overtemperature detector triggering immediate power-down of heating elements. Use Value: Meets IEC 60950-1 thermal safety thresholds with ±2.5°C accuracy up to +125°C, eliminating discrete thermal switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP121AIDBVR | Same SOT23-6 package, SPI interface, but ±1.5°C accuracy (−25°C to +85°C) and 35µA typical quiescent current. | Better accuracy and lower active current, but lacks hardware shutdown via SI pin - requires software-controlled sleep mode. | Select TMP121AIDBVR when higher accuracy and lower baseline power are prioritized over deterministic hardware shutdown. |
| TMP100AIDBVR | I²C interface (not SPI), ±2°C accuracy, 2.7V–5.5V supply, 50µA max quiescent current, same SOT23-6 package. | Requires I²C master instead of SPI peripheral; no one-shot or hardware shutdown capability; simpler command set. | Choose TMP100AIDBVR for systems already using I²C infrastructure and where SPI resource allocation is constrained. |
Compared with TMP125AIDBVRG4, TMP121AIDBVR offers tighter accuracy and lower active current but removes hardware shutdown control, while TMP100AIDBVR replaces SPI with I²C - making TMP125AIDBVRG4 the only option among the three with both SPI compatibility and dedicated SI-driven shutdown.
Availability
TMP125AIDBVRG4 is available at Aetrix Electronics and suitable for notebook computers, telecom equipment, data acquisition systems, and office machines requiring stable component supply and long-term thermal sensor availability.
Supply support for TMP125AIDBVRG4 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 expertise in precision sensing and low-power design.
The TMP125AIDBVRG4 belongs to TI's precision analog temperature sensor product line, engineered specifically for SPI-based thermal monitoring in space- and power-constrained embedded systems.
FAQ
What is the absolute maximum supply voltage for TMP125AIDBVRG4?
The absolute maximum supply voltage for TMP125AIDBVRG4 is +7V. Exceeding this rating may cause permanent damage. The device is specified to operate continuously within 2.7V to 5.5V, and operation outside this range - even briefly - risks reliability degradation. Always ensure transient suppression or regulator tolerance margins prevent voltage spikes beyond +7V at the V+ pin of TMP125AIDBVRG4.
Does TMP125AIDBVRG4 require external components to function?
TMP125AIDBVRG4 requires no external components for basic operation - it integrates the sensing element, ADC, and SPI interface on-die. However, a 0.1µF ceramic bypass capacitor between V+ and GND is strongly recommended to stabilize the internal reference and reduce noise-induced measurement error. Without it, TMP125AIDBVRG4 may exhibit increased temperature reading variance, especially in noisy power environments.
How does the hardware shutdown feature work on TMP125AIDBVRG4?
The hardware shutdown feature of TMP125AIDBVRG4 is activated by driving the SI pin high on the rising edge of the third SCK pulse during an SPI transaction. All 16 bits must be clocked; upon completion, the device enters 1µA shutdown mode. To exit, issue a 16-clock SPI frame with SI held low. This mechanism allows deterministic low-power entry/exit without firmware delays - a key differentiator of TMP125AIDBVRG4 versus software-managed alternatives.
What is the meaning of the leading zero in the TMP125AIDBVRG4 temperature register?
The TMP125AIDBVRG4 temperature register outputs a 16-bit word where D15 is always a leading zero, D14–D5 contain the 10-bit signed two's complement temperature value, and D4–D0 repeat D5 for sign extension. This format ensures correct interpretation of negative temperatures (e.g., −25°C = 1110011100) and simplifies MCU firmware handling - the leading zero guarantees MSB alignment for direct 16-bit reads without bit-shifting in TMP125AIDBVRG4 applications.
Can TMP125AIDBVRG4 be used in automotive under-hood applications?
TMP125AIDBVRG4 is rated for operation from −40°C to +125°C with guaranteed accuracy up to +125°C, and its SOT23-6 package has a thermal resistance θJA of 200°C/W - making it technically viable for non-safety-critical under-hood locations like engine control module ambient sensing. However, it is not AEC-Q200 qualified; for automotive safety systems, TI recommends Q-grade alternatives. Use TMP125AIDBVRG4 in automotive only where qualification is not mandated and thermal derating is applied.
TMP125AIDBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 9 b
- Features:
- One-Shot, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±2°C (±2.5°C)
- Test Condition:
- -25°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-6
TMP125AIDBVRG4 FAQ
1.How can I place an order for TMP125AIDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP125AIDBVRG4 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 TMP125AIDBVRG4 reliable?
The price and inventory of TMP125AIDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP125AIDBVRG4 is usually 5 days.
3.What payment methods are accepted for TMP125AIDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP125AIDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP125AIDBVRG4?
TMP125AIDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP125AIDBVRG4 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 TMP125AIDBVRG4?
For technical support, including TMP125AIDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP125AIDBVRG4 requirements.
6.How does Aetrix verify that TMP125AIDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TMP125AIDBVRG4 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 TMP125AIDBVRG4 meets industry standards.
7.What is the process for return or replacement of TMP125AIDBVRG4?
All TMP125AIDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TMP125AIDBVRG4, 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 TMP125AIDBVRG4 part is unused and in its original packaging.
Return procedure for TMP125AIDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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