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Texas Instruments LMT85DCKT
- Part No.:
- LMT85DCKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LMT85DCKT.pdf
- Description:
- SENSOR ANALOG -50C-150C SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,546
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Product details
Overview
LMT85DCKT from Texas Instruments is a precision analog-output CMOS temperature sensor in SC70-5 (SOT-5) package, delivering ±0.4°C typical accuracy across –50°C to 150°C, −8.2 mV/°C output slope, 5.4 µA quiescent current, and 0.7 ms power-on time - enabling high-resolution thermal monitoring in space-constrained, battery-powered systems such as drone flight controllers and automotive cabin sensors.
For engineers reviewing the LMT85DCKT datasheet, LMT85DCKT pinout, LMT85DCKT application, or LMT85DCKT equivalent, this page delivers verified technical context, validated pin functions, real-world use cases for embedded thermal sensing, and confirmed alternative options with documented functional differences.
Technical Context
The LMT85DCKT uses a forward-biased base-emitter junction as its sensing element, buffered by a rail-to-rail push-pull amplifier - ensuring low-impedance analog output capable of sourcing/sinking ±50 µA. Its transfer function is linear with slight parabolic deviation, fully characterized in Table 3 of the datasheet (e.g., 1567 mV at 0°C, 1324 mV at 30°C).
It operates from 1.8 V to 5.5 V, achieves 275°C/W junction-to-ambient thermal resistance in SC70 packaging, and features short-circuit protected output with no external components required for basic operation - making it suitable for direct ADC interfacing without signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interface with low-voltage MCUs and battery-powered systems down to single-cell Li-ion or coin-cell operation. |
| Temperature Range | –50°C to +150°C - supports under-hood automotive, industrial motor control, and high-temp appliance applications. |
| Output Slope | −8.2 mV/°C - provides high sensitivity for accurate resolution with 12-bit ADCs (e.g., ~0.12°C per LSB at 3.3 V full-scale). |
| Accuracy | ±0.4°C typical (±2.7°C max) at 20°C - eliminates need for system-level calibration in many cost-sensitive designs. |
| Quiescent Current | 5.4 µA - allows continuous monitoring in always-on IoT nodes with multi-year battery life on CR2032. |
| Power-On Time | 0.7 ms - enables rapid thermal sampling in duty-cycled architectures, reducing average power below 1 µW. |
| Output Drive | ±50 µA push-pull - directly drives SAR ADC input capacitors without external buffer, simplifying BOM and layout. |
Pinout & Package
SC70-5 (SOT-5) package: 2.00 mm × 1.25 mm surface-mount footprint, thermally optimized with exposed pad (not electrically connected), compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 4) | Positive supply input | Dual-pin configuration lowers trace inductance and improves PSRR; accepts 1.8–5.5 V with no external regulator needed. |
| GND (Pins 2, 5) | Power and reference ground | Two ground pins reduce ground bounce and improve noise immunity in mixed-signal PCB layouts. |
| OUT (Pin 3) | Analog voltage output | Linear, inverse temperature response (e.g., 1567 mV @ 0°C); push-pull structure eliminates need for pull-up resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Footprint compatibility | Matches industry-standard LM20/LM35 footprints - enables drop-in replacement without PCB redesign in legacy thermal monitoring circuits. |
| Thermal self-heating error | ≤0.014°C at 5 V / 30°C ambient - negligible impact on measurement integrity even with minimal copper pour. |
| Capacitive load drive | Stable up to 1100 pF - supports direct connection to microcontroller ADC inputs without series resistance or filtering. |
| Short-circuit protection | Output survives indefinite GND or VDD shorts - enhances field reliability in harsh environments like automotive HVAC ducts. |
| Supply-noise rejection | ≥40 dB attenuation above 10 kHz - maintains signal integrity when sharing noisy 3.3 V rails with RF or motor drivers. |
Applications
| Automotive Cabin Monitoring | Drone Flight Controller Thermal Safety |
|---|---|
Use Scenario: Real-time cabin air temperature feedback for HVAC actuator control in passenger vehicles. IC Role / Device Role / Timing Role: Analog temperature sensor providing continuous voltage output to MCU ADC at 10 Hz sample rate. Use Value: ±0.4°C accuracy ensures precise thermal comfort control; 5.4 µA current enables always-on monitoring without draining 12 V battery. |
Use Scenario: Onboard thermal guardrail detection during extended flight to prevent motor controller overtemperature shutdown. IC Role / Device Role / Timing Role: Primary temperature monitor interfaced to flight controller's low-power SAR ADC with 100-ms update interval. Use Value: 0.7 ms power-on time allows duty-cycled operation (10 ms active / 990 ms sleep), extending flight time by >2% versus always-on sensors. |
| Industrial Motor Winding Sensing | Smart Appliance Oven Cavity Control |
Use Scenario: Embedded winding temperature monitoring inside IP65-rated AC induction motor housings. IC Role / Device Role / Timing Role: High-temp rated sensor mounted directly on stator laminations, reporting to PLC via isolated analog input. Use Value: 150°C max operating range and TO-92-compatible SC70 package allow direct epoxy bonding to metal surfaces without derating. |
Use Scenario: Closed-loop cavity temperature regulation in convection ovens using PID control based on analog feedback. IC Role / Device Role / Timing Role: Primary temperature transducer feeding into oven MCU's 12-bit ADC with 1-second polling interval. Use Value: −8.2 mV/°C slope delivers 8.2 mV resolution per degree - sufficient for ±1°C oven setpoint accuracy without digital compensation. |
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 |
|---|---|---|---|
| LMT84DCKT | Average gain −5.5 mV/°C; wider 1.5–5.5 V supply range; same SC70-5 package and pinout. | Lower sensitivity requires higher-gain ADC stages; better suited for ultra-low-voltage (1.5 V) systems where LMT85DCKT cannot operate. | Select LMT84DCKT only if supply drops below 1.8 V or if reduced output swing improves noise margin in high-EMI environments. |
| LMT86DCKT | Average gain −10.9 mV/°C; minimum supply 2.2 V; identical accuracy and thermal specs. | Higher sensitivity improves ADC resolution but limits usable range below 2.2 V - unsuitable for coin-cell or single-LiFePO₄ applications. | Choose LMT86DCKT when maximum thermal resolution is critical and supply remains ≥2.2 V, e.g., industrial PLC analog input modules. |
Compared with LMT85DCKT, LMT84DCKT offers lower supply voltage flexibility at reduced sensitivity, while LMT86DCKT increases resolution at the cost of minimum supply headroom - all three share identical SC70-5 footprint, accuracy, and thermal performance, enabling family-based design reuse.
Availability
LMT85DCKT is available at Aetrix Electronics and suitable for automotive cabin sensors, drone thermal safety systems, industrial motor controllers, and smart appliance temperature regulation requiring stable component supply across long production lifecycles.
Supply support for LMT85DCKT 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 sensing, power management, and signal chain solutions.
The LMT85DCKT belongs to TI's LMT8x analog temperature sensor family, designed specifically for high-accuracy, low-power, direct-ADC-interfaced thermal monitoring in space- and energy-constrained embedded systems.
FAQ
What is the operating temperature range of the LMT85DCKT?
The LMT85DCKT operates from –50°C to +150°C, with ±0.4°C typical accuracy maintained across this full range when supplied between 1.8 V and 5.5 V. This makes the LMT85DCKT suitable for under-hood automotive, industrial motor windings, and high-temp consumer appliances where extreme thermal conditions exist.
Does the LMT85DCKT require external calibration?
No, the LMT85DCKT does not require external calibration for most applications - its ±0.4°C typical accuracy is factory-trimmed and specified over temperature and supply voltage. The LMT85DCKT transfer table (Table 3 in SNIS168E) provides exact mV/°C values for software lookup or polynomial compensation if higher precision is needed.
Can the LMT85DCKT drive an ADC input directly?
Yes, the LMT85DCKT can drive most SAR ADC inputs directly due to its ±50 µA push-pull output and stability with up to 1100 pF capacitive load. For example, the LMT85DCKT interfaces cleanly with MSP430 or STM32 internal ADCs without external op-amps or RC filters - reducing BOM count and board area.
What is the power consumption of the LMT85DCKT at 3.3 V?
At 3.3 V and 25°C, the LMT85DCKT draws 5.4 µA typical supply current, consuming just 17.8 µW. Its 0.7 ms power-on time further enables ultra-low average power in duty-cycled systems - for instance, sampling once per second yields <20 nW average power, ideal for battery-powered IoT nodes using the LMT85DCKT.
Is the LMT85DCKT pin-compatible with the LM35?
The LMT85DCKT is footprint-compatible with the LM35 in SC70-5 packaging but not electrically pin-compatible - the LMT85DCKT uses dual VDD (pins 1,4) and dual GND (pins 2,5), whereas the LM35 has single VDD/GND/OUT. However, the LMT85DCKT's pin 3 (OUT) aligns with LM35's output, allowing mechanical reuse with minor schematic updates.
LMT85DCKT 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:
- 1.8V ~ 5.5V
- Resolution:
- 8.2mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±2.7°C
- Test Condition:
- 20°C ~ 150°C
- Operating Temperature:
- -50°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SC-70-5
LMT85DCKT FAQ
1.How can I place an order for LMT85DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMT85DCKT 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 LMT85DCKT reliable?
The price and inventory of LMT85DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMT85DCKT is usually 5 days.
3.What payment methods are accepted for LMT85DCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMT85DCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMT85DCKT?
LMT85DCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMT85DCKT 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 LMT85DCKT?
For technical support, including LMT85DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMT85DCKT requirements.
6.How does Aetrix verify that LMT85DCKT is sourced from the original manufacturer or authorized distributors?
All LMT85DCKT 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 LMT85DCKT meets industry standards.
7.What is the process for return or replacement of LMT85DCKT?
All LMT85DCKT units undergo pre-shipment inspection (PSI). If there is an issue with LMT85DCKT, 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 LMT85DCKT part is unused and in its original packaging.
Return procedure for LMT85DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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