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Texas Instruments TMP101NA/3K
- Part No.:
- TMP101NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-6
- Datasheet:
-
TMP101NA/3K.pdf
- Description:
- SENSOR DIGITAL -55C-125C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:8,656
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Product details
Overview
TMP101NA/3K from Texas Instruments is a digital temperature sensor IC with I²C/SMBus interface, integrated ΔΣ ADC and on-chip diode sensor, delivering ±1°C typical accuracy from –55°C to 125°C, 9–12-bit user-selectable resolution (down to 0.0625°C), and ALERT output for thermal event detection - used in battery management, notebook thermal protection, and power-supply monitoring.
For engineers reviewing the TMP101NA/3K datasheet, TMP101NA/3K pinout, TMP101NA/3K application, or TMP101NA/3K equivalent, this page provides verified electrical specs, SOT-23-6 package mapping, SMBus Alert timing behavior, shutdown current (0.1 µA), and real-world thermal protection use cases - all confirmed against TI SBOS231I (Nov 2015).
Technical Context
The TMP101NA/3K implements an on-die silicon diode temperature sensor coupled to a 12-bit delta-sigma ADC, with internal oscillator and digital control logic for register-based configuration. It operates exclusively as an I²C/SMBus slave device with open-drain SDA/SCL and dedicated ALERT output.
Its functional modes include continuous conversion, one-shot measurement, shutdown (≤0.1 µA), and thermostat operation with programmable THIGH/TLOW registers. The ALERT pin supports SMBus Alert protocol for multi-device bus arbitration and polarity-selectable interrupt signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±1°C typical from –55°C to 125°C - enables direct NTC thermistor replacement without calibration or lookup tables. |
| Resolution | User-selectable 9–12 bits (0.0625°C at 12-bit) - allows trade-off between precision and conversion time (320–600 ms). |
| Supply Range | 2.7 V to 5.5 V - compatible with single Li-ion, 3.3 V, and 5 V system rails without level-shifting. |
| Quiescent Current | 45 µA active, 0.1 µA in shutdown - supports always-on thermal monitoring in battery-constrained devices. |
| I²C Speed | Up to 400 kHz (Fast Mode) and 2 MHz (High-Speed Mode) - supports high-throughput thermal polling in dense sensor networks. |
| Alert Output | Open-drain ALERT pin with SMBus Alert protocol support - enables hardware-triggered thermal interrupts without host polling. |
| Operating Temp | –55°C to 125°C - qualified for automotive under-hood, industrial motor control, and telecom power module 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/SMBus clock line requiring external pullup; accepts Fast/High-Speed Mode timing. |
| GND | Ground reference | Direct connection to metal lead frame - primary thermal path for accurate die temperature sensing. |
| ALERT | Overtemperature alert output | Open-drain interrupt signal; asserts when temp ≥ THIGH or ≤ TLOW; supports SMBus Alert command arbitration. |
| SDA | Serial data I/O | Open-drain bidirectional I²C/SMBus data line; requires external pullup; transmits MSB-first register data. |
| ADD0 | Address select input | Configures slave address (1001000b, 1001001b, or 1001010b); sampled once at first I²C communication. |
| V+ | Power supply input | 2.7–5.5 V analog/digital supply; powers sensor, ADC, oscillator, and interface logic; decoupling recommended. |
Key Features
| Feature | Design Value |
|---|---|
| ΔΣ ADC with on-die diode sensor | Eliminates external sensing components; achieves linearity without NTC compensation math or calibration. |
| SMBus Alert protocol support | Enables hardware interrupt-driven thermal response in multi-sensor systems with automatic bus arbitration. |
| User-selectable resolution (9–12 bit) | Permits dynamic optimization: 9-bit (40 ms) for fast fault detection; 12-bit (320 ms) for precision thermal profiling. |
| Shutdown mode (0.1 µA) | Reduces power in intermittently monitored applications like battery fuel gauging or periodic environmental logging. |
| Programmable THIGH/TLOW registers | Allows configurable hysteresis and trip points without external comparators - critical for fan control and overtemp lockout. |
Applications
| Power-Supply Thermal Monitoring | Notebook Computer Thermal Protection |
|---|---|
Use Scenario: Real-time temperature tracking of DC-DC converter MOSFETs and inductors during load transients. IC Role / Device Role / Timing Role: Direct die-temperature sensing via GND-connected thermal path; alerts host MCU within 320 ms (12-bit) if threshold exceeded. Use Value: Prevents thermal runaway by triggering immediate current derating before junction temperatures exceed 125°C. |
Use Scenario: CPU/GPU hotspot monitoring in ultra-thin clamshell designs where PCB space limits discrete sensor placement. IC Role / Device Role / Timing Role: SOT-23-6 footprint mounted adjacent to processor VRM; ALERT pin drives EC interrupt line for fan speed modulation. Use Value: Enables silent cooling below 70°C and aggressive fan ramp above 85°C - validated across −55°C to 125°C operating range. |
| Battery Pack Temperature Management | Industrial Motor Drive Thermal Safeguard |
Use Scenario: Cell-level temperature sampling in 4S2P Li-ion packs for charge/discharge safety compliance (UL 1642, IEC 62133). IC Role / Device Role / Timing Role: Measures pack ambient + cell proximity temperature; operates continuously at 45 µA or wakes on OS command for spot-checking. Use Value: Detects abnormal self-heating (>2°C/min rise) and triggers BMS disconnect before thermal runaway propagation. |
Use Scenario: IGBT gate driver board temperature supervision in 3-phase inverters for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Mounted on driver PCB near high-side IGBT; ALERT output latched to PLC input for emergency shutdown sequence. Use Value: Meets IEC 61800-5-1 thermal Class F (155°C) requirements with ±1°C accuracy at 125°C - no derating needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75BIMM/NOPB | Fixed 9-bit resolution (0.5°C), no ALERT pin, wider max supply (5.5 V), same SOT-23-8 package (pinout incompatible). | Lacks hardware interrupt capability; requires software polling; unsuitable for low-latency thermal shutdown. | Choose LM75BIMM/NOPB only if SMBus Alert is unnecessary and cost is primary constraint. |
| MAX31820MUA+ | 1-Wire interface (not I²C), ±0.5°C accuracy (−10°C to +85°C), 12-bit resolution, TO-92 package - no SOT-23 option. | Requires single-wire bus infrastructure; limited industrial temp range; incompatible with existing I²C firmware. | Select MAX31820MUA+ only for legacy 1-Wire systems or where board space permits TO-92 mounting. |
Compared with LM75BIMM/NOPB and MAX31820MUA+, the TMP101NA/3K uniquely combines I²C/SMBus Alert functionality, ±1°C accuracy across full −55°C to 125°C range, and SOT-23-6 footprint - making it the only drop-in solution for compact, interrupt-driven thermal protection in power electronics and portable computing.
Availability
TMP101NA/3K is available at Aetrix Electronics and suitable for battery management, notebook thermal protection, and power-supply temperature monitoring requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TMP101NA/3K 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 industrial interface solutions.
The TMP101NA/3K belongs to TI's precision analog temperature sensor product line, designed specifically for replacing NTC/PTC thermistors in space-constrained, low-power thermal protection applications across computing, industrial, and automotive domains.
FAQ
What is the absolute maximum supply voltage for TMP101NA/3K?
The absolute maximum supply voltage for TMP101NA/3K is 7.5 V, per TI SBOS231I Section 6.1. However, the recommended operating range remains 2.7 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or parametric shift, even if within absolute maximum ratings. Always operate TMP101NA/3K within its specified 2.7–5.5 V range for reliable performance and longevity.
Does TMP101NA/3K support High-Speed Mode I²C (up to 3.4 MHz)?
No, TMP101NA/3K supports Fast Mode (up to 400 kHz) and High-Speed Mode up to 2 MHz, as documented in SBOS231I Section 6.6. It does not support 3.4 MHz operation. Attempting 3.4 MHz communication will result in timing violations, ACK failures, and unreliable register reads/writes. For 3.4 MHz systems, consider TI's TMP117 or alternative I²C sensors explicitly rated for Ultra-Fast Mode.
How many TMP101NA/3K devices can share one I²C bus?
Up to three TMP101NA/3K devices can share one I²C bus, enabled by its single ADD0 pin supporting three unique slave addresses: 1001000b (ADD0 = GND), 1001001b (ADD0 = floating), and 1001010b (ADD0 = V+). This is confirmed in SBOS231I Table 3 and distinguishes TMP101NA/3K from the TMP100 (eight-address capability). No additional address decoding circuitry is required.
What is the thermal resistance (RθJA) of TMP101NA/3K in SOT-23 package?
The junction-to-ambient thermal resistance (RθJA) of TMP101NA/3K in the DBV (SOT-23-6) package is 182.9°C/W, per SBOS231I Section 6.4. This value assumes standard JEDEC 2-layer board conditions. Actual thermal performance improves significantly with copper pour under the GND pad - leveraging the GND pin as the primary thermal conduction path, as emphasized in Section 7.1.
Can TMP101NA/3K measure temperature below –55°C?
No, TMP101NA/3K is specified and characterized for operation from –55°C to 125°C only. While the device may produce output outside this range, TI does not guarantee accuracy, functionality, or reliability below –55°C. For cryogenic applications (< –55°C), consider dedicated sensors such as the TMP275 or ADT7420, which are tested and specified for extended low-temperature ranges.
TMP101NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/3K FAQ
1.How can I place an order for TMP101NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP101NA/3K 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/3K reliable?
The price and inventory of TMP101NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP101NA/3K is usually 5 days.
3.What payment methods are accepted for TMP101NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP101NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP101NA/3K?
TMP101NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP101NA/3K 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/3K?
For technical support, including TMP101NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP101NA/3K requirements.
6.How does Aetrix verify that TMP101NA/3K is sourced from the original manufacturer or authorized distributors?
All TMP101NA/3K 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/3K meets industry standards.
7.What is the process for return or replacement of TMP101NA/3K?
All TMP101NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with TMP101NA/3K, 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/3K part is unused and in its original packaging.
Return procedure for TMP101NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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