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Texas Instruments LMT84DCKT
- Part No.:
- LMT84DCKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LMT84DCKT.pdf
- Description:
- SENSOR ANALOG -50C-150C SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,854
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Product details
Overview
LMT84DCKT from Texas Instruments is a precision analog-output CMOS temperature sensor in SC70-5 (DCK) package, delivering ±0.4°C typical accuracy over –50°C to +150°C, −5.5 mV/°C output slope, 5.4 µA quiescent current, and 1.5 V to 5.5 V supply operation - ideal for battery-powered drone thermal monitoring and automotive infotainment ambient sensing.
For engineers reviewing the LMT84DCKT datasheet, LMT84DCKT pinout, LMT84DCKT application, or LMT84DCKT equivalent, this page provides verified electrical parameters, SC70-5 package mapping, thermal time constant data, push-pull output drive capability, and validated alternatives for low-voltage analog temperature sensing in space-constrained embedded systems.
Technical Context
The LMT84DCKT uses a forward-biased base-emitter junction as its sensing element, buffered by a rail-to-rail push-pull amplifier with ±50 µA sourcing/sinking capability. Its output voltage decreases linearly with rising temperature at −5.5 mV/°C, with monotonic behavior maintained across full supply (1.5–5.5 V) and temperature (−50°C to +150°C) ranges.
Self-heating error is minimized by ultra-low 5.4 µA supply current and direct die-to-GND thermal path; junction-to-ambient thermal resistance (RθJA) is 275°C/W in the SC70-5 package. Power-on time is 0.7 ms (typical) with no capacitive load, enabling rapid duty-cycled measurement in energy-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 5.5 V - enables direct connection to single-cell Li-ion, coin cell, or low-voltage MCU rails without regulation. |
| Output Slope | −5.5 mV/°C - provides high-resolution analog voltage change per degree, simplifying ADC-based temperature calculation. |
| Accuracy (Typ) | ±0.4°C over −50°C to +150°C at 2.3–5.5 V - supports high-fidelity thermal feedback in safety-critical powertrain and smoke detection systems. |
| Quiescent Current | 5.4 µA - allows >1-year battery life in 10-s sampling interval sensor nodes (e.g., wireless HVAC monitors). |
| Power-On Time | 0.7 ms - permits fast wake-up and measurement cycles in microcontroller-controlled thermal polling architectures. |
| Output Drive | ±50 µA push-pull - directly drives SAR ADC input sampling capacitors without external buffer, reducing BOM count. |
| Thermal Time Constant | Not specified for DCK package - only documented for TO-92S (LMT84LPG: 10 s @ 1.2 m/s airflow); SC70 variant optimized for PCB-mounted thermal response. |
Pinout & Package
SC70-5 (DCK) package: 2.00 mm × 1.25 mm surface-mount footprint, 0.65 mm lead pitch, thermally enhanced GND pad on bottom. Pin 1 = GND, Pin 2 = GND, Pin 3 = OUT, Pin 4 = VDD, Pin 5 = GND - triple-ground configuration improves noise immunity and thermal stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 5 | GND | Power and signal reference ground; pins 1/2/5 form low-inductance return path and thermal conduction path to PCB. |
| 3 | OUT | Analog output voltage inversely proportional to temperature; push-pull stage eliminates need for pull-up resistor. |
| 4 | VDD | Positive supply input; accepts 1.5–5.5 V with <200 µV/V line regulation - stable under varying battery voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Footprint compatibility | Matches industry-standard LM20/LM35 pinouts in SC70 - enables drop-in replacement without layout revision. |
| Short-circuit protection | Output survives indefinite short to VDD or GND - enhances field reliability in industrial wiring environments. |
| Rail-to-rail push-pull output | Drives ±50 µA while maintaining linearity - eliminates external op-amp for ADC interfacing in cost-sensitive designs. |
| Low self-heating error | 0.015°C max junction rise at 5 V / 2 µA load - preserves measurement fidelity in thermally isolated mounting scenarios. |
| Capacitive load tolerance | Stable up to 1100 pF - supports direct connection to high-input-capacitance SAR ADCs without series resistor. |
Applications
| Infotainment Ambient Sensing | Drone Battery Thermal Monitoring |
|---|---|
Use Scenario: Real-time cabin temperature feedback in automotive head units to auto-adjust HVAC setpoints and display thermal comfort metrics. IC Role / Device Role / Timing Role: Analog temperature sensor providing continuous voltage output to MCU's 12-bit ADC channel at 100-ms intervals. Use Value: ±0.4°C accuracy ensures HVAC control within ±0.5°C target band; 1.5-V operation extends head unit runtime during cold-cranking battery conditions. |
Use Scenario: Monitoring LiPo battery pack surface temperature during flight to trigger thermal throttling or emergency landing protocols. IC Role / Device Role / Timing Role: Low-power analog sensor powered intermittently via MCU GPIO to minimize standby drain between 5-s telemetry bursts. Use Value: 5.4 µA quiescent current enables >18 months of shelf life; SC70-5 size fits tight battery compartment layouts without compromising thermal coupling. |
| Smoke Detector Heat Thresholding | Industrial Appliance Motor Winding Sensing |
Use Scenario: Dual-sensor fire alarm system combining photoelectric smoke detection with rapid-response heat rise detection above 57°C. IC Role / Device Role / Timing Role: Primary thermal threshold detector feeding comparator circuit; outputs analog voltage to validate rate-of-rise algorithms. Use Value: Fast 0.7-ms power-on time enables immediate thermal validation after wake-up; −50°C to +150°C range covers storage-to-alarm operating extremes. |
Use Scenario: Embedded thermal protection in washing machine motor control boards to prevent insulation breakdown during extended spin cycles. IC Role / Device Role / Timing Role: Directly mounted on motor driver PCB near power MOSFETs, reporting junction-adjacent temperature to safety MCU. Use Value: Triple-GND SC70 pinout reduces thermal impedance to PCB copper; ±2.7°C max error ensures compliance with IEC 60730 Class B thermal cutoff requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-output temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMT85DCKT | Average gain −8.2 mV/°C; min supply 1.8 V; ±0.5°C typ accuracy over −50°C to +150°C | Higher sensitivity improves ADC LSB resolution but requires ≥1.8 V supply - unsuitable for 1.5 V coin-cell systems | Select LMT85DCKT when higher output voltage swing per °C is needed and supply ≥1.8 V is guaranteed. |
| LM20DCKT | Gain −11.7 mV/°C; 2.4–5.5 V supply; ±1.5°C max accuracy; no push-pull output - open-collector requiring pull-up | Higher gain aids low-resolution ADCs but lacks drive strength; wider supply range excludes sub-2.4 V operation | Choose LM20DCKT only if legacy LM20 footprint reuse is mandatory and ±1.5°C error is acceptable. |
Compared with LMT84DCKT, LMT85DCKT offers greater sensitivity at higher supply voltages, while LM20DCKT provides legacy compatibility at reduced accuracy and weaker output drive - making LMT84DCKT the optimal balance of low-voltage operation, precision, and interface simplicity.
Availability
LMT84DCKT is available at Aetrix Electronics and suitable for drone telemetry, automotive infotainment, and industrial appliance thermal management requiring stable component supply across multi-year production cycles.
Supply support for LMT84DCKT 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 and embedded processing technologies, with decades of expertise in precision sensor design and automotive-grade reliability.
The LMT84DCKT belongs to TI's LMT8x family of analog temperature sensors, engineered specifically for ultra-low-power, high-accuracy thermal monitoring in battery-operated and space-constrained embedded systems.
FAQ
What is the absolute maximum supply voltage for the LMT84DCKT?
The LMT84DCKT has an absolute maximum supply voltage of 6 V, as specified in Section 7.1 of the SNIS167E datasheet. Operation beyond this limit risks permanent damage. For reliable long-term performance, maintain VDD within the recommended 1.5 V to 5.5 V range - exceeding 5.5 V violates functional specifications even if below the 6 V stress rating.
Does the LMT84DCKT require an external pull-up resistor on the OUT pin?
No, the LMT84DCKT does not require an external pull-up resistor because it features a push-pull output stage capable of sourcing and sinking ±50 µA. This internal driver eliminates external components for standard ADC interfacing, unlike open-collector sensors such as the LM20DCKT. The LMT84DCKT output remains valid down to 0 V and up to VDD.
Can the LMT84DCKT be used in automotive applications?
The LMT84DCKT itself is not AEC-Q100 qualified; however, the pin-compatible LMT84DCKT-Q1 variant is automotive-grade and qualified to AEC-Q100 Grade 2 (−40°C to +105°C). For non-automotive applications like drones or appliances, the standard LMT84DCKT meets full −50°C to +150°C operational range and is widely deployed in infotainment and powertrain subsystems where qualification is handled at the module level.
What is the thermal time constant of the LMT84DCKT in SC70-5 package?
The thermal time constant is not specified for the LMT84DCKT SC70-5 package in the official datasheet. Only the TO-92S variant (LMT84LPG) lists a typical 10-second thermal time constant under 1.2 m/s airflow. The SC70-5 version is optimized for PCB-conducted thermal response, and actual time constant depends heavily on PCB copper area, thickness, and mounting method - typically faster than through-hole packages due to lower thermal mass.
How does the LMT84DCKT handle capacitive loads on its output?
The LMT84DCKT is stable driving capacitive loads up to 1100 pF without external compensation, as confirmed in Section 8.4.3 and Figure 11 of the datasheet. For loads exceeding 1100 pF, a series resistor (e.g., 800 Ω for 1 µF) must be added per Table 4 to ensure stability. This capability enables direct connection to high-input-capacitance SAR ADCs common in modern microcontrollers.
LMT84DCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- -50°C ~ 150°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 1.5V ~ 5.5V
- Resolution:
- 5.5mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±2.7°C
- Test Condition:
- 0°C ~ 150°C
- Operating Temperature:
- -50°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SC-70-5
LMT84DCKT FAQ
1.How can I place an order for LMT84DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMT84DCKT 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 LMT84DCKT reliable?
The price and inventory of LMT84DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMT84DCKT is usually 5 days.
3.What payment methods are accepted for LMT84DCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMT84DCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMT84DCKT?
LMT84DCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMT84DCKT 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 LMT84DCKT?
For technical support, including LMT84DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMT84DCKT requirements.
6.How does Aetrix verify that LMT84DCKT is sourced from the original manufacturer or authorized distributors?
All LMT84DCKT 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 LMT84DCKT meets industry standards.
7.What is the process for return or replacement of LMT84DCKT?
All LMT84DCKT units undergo pre-shipment inspection (PSI). If there is an issue with LMT84DCKT, 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 LMT84DCKT part is unused and in its original packaging.
Return procedure for LMT84DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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