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Texas Instruments TMP101NA/250G4
- Part No.:
- TMP101NA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-6
- Datasheet:
-
TMP101NA/250G4.pdf
- Description:
- SENSOR DIGITAL -55C-125C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,627
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Product details
Overview
TMP101NA/250G4 from Texas Instruments is a digital temperature sensor IC with I²C/SMBus interface, integrated ΔΣ ADC and on-chip diode-based thermal sensing element. It delivers ±1°C typical accuracy from –55°C to 125°C, 9–12-bit user-selectable resolution (down to 0.0625°C), and operates from 2.7 V to 5.5 V. It is used for thermal protection in battery management, notebook computers, and power-supply monitoring.
For engineers reviewing the TMP101NA/250G4 datasheet, TMP101NA/250G4 pinout, TMP101NA/250G4 application, or TMP101NA/250G4 equivalent, key selection considerations include its single-address-pin configuration, open-drain ALERT output with SMBus Alert support, 6-pin SOT-23 package, shutdown current of 0.1 µA, and compatibility with fast-mode (400 kHz) and high-speed-mode (up to 2 MHz) I²C buses.
Technical Context
The TMP101NA/250G4 implements an on-die silicon diode temperature sensor interfaced to a 12-bit delta-sigma ADC, eliminating external signal conditioning. Its digital core includes a programmable Configuration Register controlling resolution, shutdown, OS mode, and TM/ALERT behavior.
It operates exclusively as an I²C/SMBus slave device with open-drain SDA and SCL pins, supports General Call reset, and features hardware-based ALERT assertion tied to THIGH/TLOW limit registers - distinct from the TMP100's dual-address-pin architecture and lack of physical ALERT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±1°C typical from –55°C to 125°C - enables direct replacement of NTC/PTC thermistors without calibration. |
| Resolution | 9–12 bits user-selectable - yields 0.5°C to 0.0625°C step size; default 12-bit provides highest precision for thermal thresholding. |
| Supply Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level-shifting. |
| Quiescent Current | 45 µA active, 0.1 µA in shutdown - supports always-on thermal monitoring in battery-powered systems. |
| I²C Speed | Up to 2 MHz high-speed mode - allows rapid polling in real-time thermal control loops. |
| Alert Output | Open-drain ALERT pin with SMBus Alert protocol - enables multi-device interrupt arbitration without host polling overhead. |
| Operating Temp | –55°C to 125°C - qualified for industrial, automotive under-hood, and computing thermal environments. |
Pinout & Package
Package: 6-pin SOT-23 (DBV), body size 2.90 mm × 1.60 mm, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL | Serial clock input | Open-drain I²C clock line requiring external pull-up; accepts fast-mode (400 kHz) and high-speed-mode (2 MHz) timing. |
| GND | Ground reference | Primary thermal path via metal lead frame; must be connected to system ground plane for accurate die temperature measurement. |
| ALERT | Overtemperature alert output | Open-drain interrupt signal asserted when temperature ≥ THIGH; requires external pull-up resistor per SMBus spec. |
| SDA | Serial data I/O | Open-drain bidirectional I²C data line; shares bus with other SMBus/I²C slaves using standard ACK/NACK protocol. |
| ADD0 | Address select input | Configures one of three possible I²C slave addresses (1001000b, 1001001b, or 1001010b); sampled at first bus communication. |
| V+ | Power supply input | Accepts 2.7–5.5 V; internal LDO regulates core logic; decoupling capacitor required within 1 cm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Single-address-pin topology | Supports up to three TMP101NA/250G4 devices per I²C bus - simplifies multi-zone thermal monitoring without address conflicts. |
| SMBus Alert protocol | Enables hardware interrupt-driven thermal event handling - eliminates continuous polling and reduces MCU wake cycles. |
| User-selectable resolution | 9–12-bit setting balances conversion time (320–600 ms full-scale) and precision (0.0625°C step) for application-specific latency/accuracy trade-offs. |
| Shutdown + One-Shot mode | 0.1 µA standby current with on-demand single conversion - ideal for intermittent thermal sampling in energy-constrained IoT nodes. |
| On-die diode sensor | Measures junction temperature directly - avoids thermal lag and calibration drift associated with external thermistors or RTDs. |
Applications
| Power-Supply Temperature Monitoring | Computer Peripheral Thermal Protection |
|---|---|
Use Scenario: Real-time monitoring of DC-DC converter MOSFET and inductor temperature during load transients. IC Role / Device Role / Timing Role: Digital temperature sensor providing I²C-readable die temperature data to system controller every 500 ms. Use Value: Prevents thermal runaway by triggering dynamic voltage scaling or fan speed increase before critical thresholds are exceeded. | Use Scenario: Overtemperature detection in USB-C docking station port controllers and PD ICs. IC Role / Device Role / Timing Role: ALERT pin asserts immediately upon crossing THIGH, signaling host MCU to disable charging or reduce data rate. Use Value: Hardware-level response bypasses software latency, ensuring compliance with USB PD thermal safety requirements. |
| Notebook Computers | Battery Management Systems |
Use Scenario: CPU/GPU proximity sensing adjacent to heat pipes and vapor chambers. IC Role / Device Role / Timing Role: High-resolution (12-bit) temperature register read via SMBus during OS thermal management polling cycles. Use Value: Enables fine-grained throttling decisions with <0.1°C sensitivity, improving performance-per-watt without exceeding JEDEC limits. | Use Scenario: Cell-can surface temperature tracking in smart Li-ion battery packs. IC Role / Device Role / Timing Role: Low-quiescent-current (45 µA) sensor operating continuously during pack sleep mode, waking only to report ALERT events. Use Value: Extends battery runtime while maintaining UL 1642 and IEC 62133 thermal fault coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP100NA/250G4 | Two address pins (ADD0/ADD1), no ALERT pin, supports up to eight devices per bus. | Lacks hardware interrupt; requires periodic polling to detect overtemperature events. | Select when bus node count >3 is required and interrupt-driven response is unnecessary. |
| LM75BIMM/NOPB | Fixed 9-bit resolution (0.5°C), no user-configurable resolution, no SMBus Alert, wider supply range (2.8–5.5 V). | Lower accuracy (±2°C max), no One-Shot mode, simpler register map but less flexible threshold control. | Select for cost-sensitive, low-complexity thermal monitoring where sub-0.5°C resolution is not required. |
Compared with TMP100NA/250G4 and LM75BIMM/NOPB, the TMP101NA/250G4 uniquely combines single-pin address flexibility, hardware ALERT interrupt, and selectable resolution - making it optimal for compact, responsive thermal protection in space-constrained portable electronics.
Availability
TMP101NA/250G4 is available at Aetrix Electronics and suitable for power-supply temperature monitoring, notebook computers, and battery management systems requiring stable component supply across extended product lifecycles.
Supply support for TMP101NA/250G4 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 and embedded processing technologies, with leadership in precision sensing, power management, and interface solutions.
The TMP101NA/250G4 belongs to TI's precision analog temperature sensor product line, designed specifically for replacing thermistors in digital thermal management systems where calibration-free accuracy, low power, and I²C interoperability are critical.
FAQ
What is the primary sensing mechanism inside the TMP101NA/250G4?
The TMP101NA/250G4 uses an on-die silicon diode as its temperature-sensing element, whose forward voltage exhibits a predictable, linear temperature coefficient. This diode feeds a 12-bit delta-sigma ADC, enabling direct digital temperature output without external components. The TMP101NA/250G4 does not rely on external thermistors or RTDs - its accuracy derives entirely from the monolithic integration of sensor and converter.
Does the TMP101NA/250G4 require calibration during system integration?
No, the TMP101NA/250G4 does not require system-level calibration. It achieves ±1°C typical accuracy from –55°C to 125°C across its full operating range, as specified in the official datasheet SBOS231I. This factory-trimmed performance eliminates the need for end-of-line calibration routines, lookup tables, or polynomial compensation - reducing firmware complexity and test time in production.
How does the ALERT pin on the TMP101NA/250G4 function in SMBus Alert mode?
In SMBus Alert mode (TM = 1), the ALERT pin on the TMP101NA/250G4 asserts low when temperature ≥ THIGH or ≤ TLOW, depending on polarity bit (POL). Upon master issuance of the SMBus Alert command (00011001b), the TMP101NA/250G4 responds with its slave address on SDA, allowing the host to identify the source of the interrupt without polling - a feature absent in the TMP100NA/250G4.
Can the TMP101NA/250G4 operate on a 3.3 V supply while communicating with a 5 V I²C master?
Yes, the TMP101NA/250G4 operates from 2.7 V to 5.5 V and tolerates I²C bus voltages up to 7.5 V on SDA and SCL. When powered from 3.3 V, its open-drain outputs remain compatible with 5 V masters provided external pull-up resistors are connected to the master's 5 V domain - no level shifter is needed due to its overvoltage-tolerant I/O structure.
What is the minimum conversion time for the TMP101NA/250G4 at 12-bit resolution?
At 12-bit resolution, the TMP101NA/250G4 requires 320 ms minimum and 600 ms maximum conversion time, as specified in the Electrical Characteristics table of SBOS231I. This interval represents the time from command initiation to valid data in the Temperature Register. Lower resolutions (e.g., 9-bit) reduce this to 40–75 ms, enabling faster thermal updates when absolute precision is relaxed.
TMP101NA/250G4 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:
- -55°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Resolution, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- -25°C ~ 85°C (-55°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-6
TMP101NA/250G4 FAQ
1.How can I place an order for TMP101NA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP101NA/250G4 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 TMP101NA/250G4 reliable?
The price and inventory of TMP101NA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP101NA/250G4 is usually 5 days.
3.What payment methods are accepted for TMP101NA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP101NA/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP101NA/250G4?
TMP101NA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP101NA/250G4 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 TMP101NA/250G4?
For technical support, including TMP101NA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP101NA/250G4 requirements.
6.How does Aetrix verify that TMP101NA/250G4 is sourced from the original manufacturer or authorized distributors?
All TMP101NA/250G4 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 TMP101NA/250G4 meets industry standards.
7.What is the process for return or replacement of TMP101NA/250G4?
All TMP101NA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with TMP101NA/250G4, 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 TMP101NA/250G4 part is unused and in its original packaging.
Return procedure for TMP101NA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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