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Texas Instruments TMP123AIDBVT
- Part No.:
- TMP123AIDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-6
- Datasheet:
-
TMP123AIDBVT.pdf
- Description:
- SENSOR DIGITAL -40C-125C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:448
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Product details
Overview
TMP123AIDBVT from Texas Instruments is a 12-bit + sign SPI-compatible digital temperature sensor in SOT23-6 package, delivering ±1.5°C accuracy from −25°C to +85°C, 0.0625°C resolution, and operation up to +150°C. It serves as a self-contained thermal sensing node for battery management, notebook thermal protection, and power-supply monitoring without external components.
For engineers reviewing the TMP123AIDBVT datasheet, TMP123AIDBVT pinout, TMP123AIDBVT application, or TMP123AIDBVT equivalent, key selection criteria include SPI interface timing compliance, thermal accuracy over extended industrial range (−55°C to +150°C), low-quiescent-current operation (≤50 µA), and SOT23-6 footprint compatibility with space-constrained PCB layouts.
Technical Context
The TMP123AIDBVT integrates a diode-based temperature sensor, delta-sigma A/D converter, oscillator, control logic, and SPI-compatible serial interface. Its temperature register outputs 16-bit two's complement data with 12 valid bits plus sign, latched on CS assertion and clocked out MSB-first on SO at falling SCK edges.
It operates continuously while CS is high (converting every 480–640 ms), enters analog shutdown when CS is pulled low (reducing quiescent current to ≤3 µA), and requires no external passive components-only a recommended 0.1 µF supply bypass capacitor. Thermal sensing relies on the die flag thermally coupled to pin 2 (NC), not ambient air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit + sign, 0.0625°C step - enables precise thermal threshold detection within 1°C bands using only 13 bits of readback. |
| Accuracy | ±1.5°C max from −25°C to +85°C - meets thermal guardbanding requirements for CPU/GPU throttling and battery safety cutoffs. |
| Supply Range | 2.7V to 5.5V - supports direct connection to Li-ion battery rails (3.0–4.2V) and 3.3V/5V system supplies without regulation. |
| Quiescent Current | ≤50 µA active, ≤3 µA shutdown - extends battery life in always-on thermal monitoring nodes (e.g., smart battery packs). |
| Operating Range | −55°C to +150°C - enables use in under-hood automotive modules and industrial motor drives where ambient exceeds +125°C. |
| Conversion Period | 480–640 ms - defines minimum polling interval for host MCU; allows duty-cycled reads to reduce average system power. |
| Interface | SPI-compatible (CS/SCK/SO) - interoperates with standard MCU SPI peripherals without protocol translation or glue logic. |
Pinout & Package
SOT23-6 package (DBV), 2.9 mm × 1.6 mm × 1.45 mm, RoHS-compliant, moisture sensitivity level 2 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: NC | No Connection | Must be left floating or tied to GND; not internally connected - avoids unintended thermal coupling or noise injection. |
| 2: GND | Ground Reference | Primary thermal path via lead frame; connects to die flag - mounting this pin to thermal mass improves measurement stability. |
| 3: V+ | Power Supply | Accepts 2.7V–5.5V; internal regulator powers sensor core and interface - eliminates need for external LDO in low-power designs. |
| 4: SO | Serial Output | Tri-state open-drain output; data valid on SCK falling edge - compatible with 3.3V/5V MCU inputs and supports multi-drop bus sharing. |
| 5: CS | Chip Select | Active-low enable; initiates shutdown and latches last conversion - used for synchronous read timing and power gating. |
| 6: SCK | Serial Clock | Input clock (min 100 ns period); controls data shift rate - sets maximum SPI frequency to ≤10 MHz for reliable readout. |
Key Features
| Feature | Design Value |
|---|---|
| Self-contained thermal sensing | No external RC network or calibration required - reduces BOM count and layout complexity in compact consumer devices. |
| Hardware shutdown mode | CS-driven entry into ≤3 µA state - enables microcontroller-initiated power savings between thermal sampling intervals. |
| Die-temperature sensing | Thermal coupling via pin 2 (GND on TMP121, NC on TMP123) - measures IC junction temperature directly, not ambient air. |
| Binary two's complement output | 16-bit word with sign bit first - simplifies firmware parsing on 8-/16-bit MCUs without floating-point or sign-extension overhead. |
| Robust SPI timing margins | t2 ≤30 ns SCK-to-SO delay, t4 ≤30 ns CS-to-data delay - ensures reliable communication even with low-cost MCU GPIO bit-banging. |
Applications
| Power-Supply Thermal Monitoring | Notebook Computer Thermal Protection |
|---|---|
Use Scenario: Real-time temperature tracking of DC-DC converter MOSFETs and inductors in laptop VRMs. IC Role / Device Role / Timing Role: Primary die-temperature sensor feeding thermal feedback to system controller for dynamic voltage/frequency scaling. Use Value: Enables early overtemperature detection before thermal runaway, supporting ASL/ACPI thermal event reporting with <1°C resolution. | Use Scenario: Localized hotspot monitoring near GPU, CPU, and battery compartments in ultrabooks. IC Role / Device Role / Timing Role: Dedicated thermal node providing independent readings to EC (Embedded Controller) for fan speed control and shutdown decisions. Use Value: Delivers ±1.5°C accuracy across −25°C to +85°C ambient, meeting Intel Dynamic Platform and Thermal Framework (DPTF) input requirements. |
| Cell Phone Battery Management | Office Machine Thermal Safety |
Use Scenario: Integration into smart battery packs to monitor cell temperature during fast charging and discharge cycles. IC Role / Device Role / Timing Role: Standalone temperature monitor interfacing directly with battery fuel gauge IC via shared SPI bus. Use Value: Operates down to −55°C and up to +150°C, covering full Li-ion operational envelope while consuming <50 µA during active measurement. | Use Scenario: Thermal cutoff sensing in laser printer fuser assemblies and copier paper paths. IC Role / Device Role / Timing Role: Safety-critical temperature watchdog placed adjacent to heating rollers to prevent overheating damage. Use Value: Withstands +150°C continuous operation and provides fail-safe shutdown signal via host MCU when exceeding programmable thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP121AIDBVT | Same SOT23-6 package and SPI interface; differs in pin 2 function (GND vs NC) and thermal path optimization - TMP121 uses pin 2 as GND for enhanced thermal conduction. | Preferred where PCB ground plane is large and thermally coupled to sensor; TMP123 better suited when pin 2 must remain unconnected for routing constraints. | Select TMP121AIDBVT if thermal accuracy at extreme temperatures (−55°C/+150°C) is prioritized and GND pin placement aligns with thermal pad layout. |
| MAX31820 | 1-Wire interface (single-wire bus), 12-bit resolution, ±0.5°C accuracy (−10°C to +85°C), 3.0–5.5V supply - lacks SPI compatibility and extended high-temp operation (+125°C max). | Used in distributed sensor networks with minimal I/O count; unsuitable for systems requiring deterministic SPI timing or >+125°C operation. | Choose MAX31820 only when reducing MCU GPIO usage outweighs loss of SPI integration and high-temp capability. |
Compared with TMP121AIDBVT, the TMP123AIDBVT offers identical electrical specs but optimized thermal coupling through an NC pin instead of GND - enabling flexible PCB layout while maintaining ±1.5°C accuracy. Versus MAX31820, TMP123AIDBVT provides faster, deterministic SPI reads and 25°C higher operating ceiling, critical for automotive and industrial deployments.
Availability
TMP123AIDBVT is available at Aetrix Electronics and suitable for power-supply thermal monitoring, notebook computer thermal protection, and battery management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TMP123AIDBVT 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, embedded processing, and connectivity technologies, with leadership in precision analog and sensor solutions.
The TMP123AIDBVT belongs to TI's precision analog temperature sensor product line, designed specifically for low-power, high-accuracy thermal monitoring in space-constrained portable and industrial electronics.
FAQ
What is the maximum operating temperature of the TMP123AIDBVT?
The TMP123AIDBVT has a specified operating temperature range of −55°C to +150°C, with guaranteed functionality and parametric performance up to +150°C junction temperature. This makes the TMP123AIDBVT suitable for under-hood automotive applications and high-temperature industrial environments where standard sensors fail.
Does the TMP123AIDBVT require external components for basic operation?
No, the TMP123AIDBVT requires no external components for fundamental temperature measurement. A 0.1 µF ceramic bypass capacitor on V+ is recommended for noise suppression, but no resistors, capacitors, or calibration circuitry are needed - the TMP123AIDBVT integrates all sensing, conversion, and interface functions internally.
How does the TMP123AIDBVT differ from the TMP121AIDBVT in pin configuration?
The TMP123AIDBVT uses pin 2 as NC (no connection), whereas the TMP121AIDBVT assigns pin 2 as GND. Both share identical SOT23-6 pinout numbering and SPI interface (pins 4–6), but the TMP123AIDBVT's NC pin allows greater PCB routing flexibility, while the TMP121AIDBVT's GND pin provides superior thermal conduction to the die flag.
What is the conversion time and period for the TMP123AIDBVT?
The TMP123AIDBVT performs a 12-bit conversion in 240–320 ms (typical 250 ms), with a full conversion period - time between successive conversions - of 480–640 ms (typical 500 ms). This timing is fixed and independent of supply voltage or temperature, enabling predictable host MCU polling schedules.
Is the TMP123AIDBVT SPI interface fully compliant with standard SPI protocols?
The TMP123AIDBVT implements an SPI-compatible interface (CS/SCK/SO) with defined timing parameters (e.g., t2 ≤30 ns, t4 ≤30 ns), but it does not support bidirectional MISO/MOSI or clock polarity/phase configuration. It operates in a simplified read-only mode: CS low latches data, and SCK falling edges shift out 16 bits MSB-first - sufficient for most MCU SPI peripherals in master mode.
TMP123AIDBVT 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:
- 12 b
- Features:
- Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±2°C)
- Test Condition:
- -25°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-6
TMP123AIDBVT FAQ
1.How can I place an order for TMP123AIDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP123AIDBVT 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 TMP123AIDBVT reliable?
The price and inventory of TMP123AIDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP123AIDBVT is usually 5 days.
3.What payment methods are accepted for TMP123AIDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP123AIDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP123AIDBVT?
TMP123AIDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP123AIDBVT 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 TMP123AIDBVT?
For technical support, including TMP123AIDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP123AIDBVT requirements.
6.How does Aetrix verify that TMP123AIDBVT is sourced from the original manufacturer or authorized distributors?
All TMP123AIDBVT 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 TMP123AIDBVT meets industry standards.
7.What is the process for return or replacement of TMP123AIDBVT?
All TMP123AIDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TMP123AIDBVT, 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 TMP123AIDBVT part is unused and in its original packaging.
Return procedure for TMP123AIDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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