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Texas Instruments LMT85QDCKTQ1
- Part No.:
- LMT85QDCKTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LMT85QDCKTQ1.pdf
- Description:
- SENSOR ANALOG -50C-150C SC70
- Quantity:
- Payment:
- Shipping:
Inventory:276
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Product details
Overview
LMT85QDCKTQ1 from Texas Instruments is an AEC-Q100 Grade 0 qualified analog-output CMOS temperature sensor with ±0.4°C typical accuracy, −8.2 mV/°C average sensor gain, and 1.8-V to 5.5-V supply operation. It delivers linear inverse-voltage output (e.g., 1567 mV at 0°C, 651 mV at 110°C), 5.4-µA quiescent current, and push-pull output capable of ±50-µA drive - enabling direct interface to microcontroller ADCs in automotive infotainment, powertrain, and drone thermal monitoring systems.
For engineers reviewing the LMT85QDCKTQ1 datasheet, LMT85QDCKTQ1 pinout, LMT85QDCKTQ1 application, or LMT85QDCKTQ1 equivalent, key selection considerations include its SC70-5 package footprint compatibility with LM20/LM35, guaranteed ±2.7°C max error over −50°C to +150°C without calibration, short-circuit protected output, and low self-heating (<0.014°C at 30°C ambient).
Technical Context
The LMT85QDCKTQ1 uses a forward-biased base-emitter junction as its sensing element, buffered by a rail-to-rail CMOS amplifier with push-pull output stage - delivering monotonic, low-impedance analog voltage output inversely proportional to temperature. Its transfer function follows a slight parabolic shape accurately captured in the 201-point lookup table (−50°C to +150°C), with linear approximation yielding −8.20 mV/°C slope over defined ranges.
Thermal coupling is optimized via direct die attachment to GND pin; junction-to-board thermal resistance is 56°C/W. The device supports power cycling via VDD control (e.g., MCU GPIO), achieving 0.7-ms power-on time and <9-µA max supply current - making it suitable for battery-constrained automotive sensor nodes where self-heating must remain below 0.02°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±0.4°C typical (±2.7°C max) over −50°C to +150°C; no calibration required for automotive Grade 0 compliance |
| Output Gain | −8.2 mV/°C average slope; enables simple linear ADC conversion with <0.5°C error over 20°C–50°C range |
| Supply Range | 1.8 V to 5.5 V; supports direct connection to 1.8-V logic rails and legacy 3.3/5-V systems |
| Quiescent Current | 5.4 µA typical at 30°C; allows >1-year battery life in 10-sampling-per-minute sensor nodes |
| Power-On Time | 0.7 ms typical (CL = 0–1100 pF); ensures fast wake-up in duty-cycled thermal monitoring |
| Output Drive | ±50 µA push-pull; sufficient to charge typical SAR ADC input capacitors without external buffer |
| Thermal Response | Junction-to-board RθJB = 56°C/W; minimizes measurement lag when mounted on PCB copper |
Pinout & Package
Package: SC70-5 (SOT-5), 2.00 mm × 1.25 mm surface-mount body with exposed pad not connected internally. Pin 1 and Pin 4 are both VDD; Pin 2 and Pin 5 are both GND - enabling dual-power-path routing and improved thermal conduction to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 4) | Positive supply input | Dual-pin configuration reduces IR drop and improves noise immunity; accepts 1.8–5.5 V with 6-V absolute max rating |
| GND (Pins 2, 5) | Power and reference ground | Dual ground pins thermally anchor die backside; mandatory for accurate thermal conduction per TI layout guidelines |
| OUT (Pin 3) | Analog output voltage | Push-pull stage provides bidirectional current; outputs inverse voltage (e.g., 1324 mV at 30°C) with ±50 µA sink/source capability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40°C to +150°C ambient operation in automotive infotainment and powertrain ECUs |
| Footprint compatibility | SC70-5 pinout matches industry-standard LM20/LM35 packages - enables drop-in replacement without PCB redesign |
| Short-circuit protected output | Withstands indefinite OUT-to-GND or OUT-to-VDD shorts without damage or parameter shift |
| Low self-heating error | 0.014°C rise at 30°C ambient with 2-µA load - critical for sealed enclosure or epoxy-potted deployments |
| Capacitive load tolerance | Stable with ≤1100 pF directly; supports direct connection to ADC sampling capacitors without series resistor |
Applications
| Infotainment System Thermal Monitoring | Powertrain Control Module Sensing |
|---|---|
Use Scenario: Real-time CPU/GPU die temperature tracking inside automotive head units to trigger dynamic clock throttling before thermal shutdown. IC Role / Device Role / Timing Role: Analog temperature sensor providing continuous voltage output to MCU's 12-bit ADC channel with 0.5°C resolution. Use Value: ±0.4°C typical accuracy eliminates need for system-level calibration; 5.4-µA quiescent current extends standby battery life during vehicle sleep mode. | Use Scenario: Coolant temperature measurement near engine block for closed-loop fuel injection timing adjustment in gasoline direct injection systems. IC Role / Device Role / Timing Role: Primary analog temperature transducer interfacing to powertrain ECU's analog front-end with minimal external components. Use Value: −50°C to +150°C operating range covers cold-start to peak-load conditions; ±2.7°C max error meets ASAM MCD-2 MC functional safety requirements. |
| Drone Battery Pack Monitoring | Smoke Detector Heat Threshold Detection |
Use Scenario: Embedded Li-ion battery pack temperature supervision in UAV flight controllers to prevent thermal runaway during rapid discharge cycles. IC Role / Device Role / Timing Role: Low-power analog sensor powered intermittently via MCU GPIO to minimize idle current draw between telemetry bursts. Use Value: 0.7-ms power-on time enables sub-millisecond thermal sampling; SC70-5 footprint allows placement directly on battery PCB edge for optimal thermal coupling. | Use Scenario: Dual-sensor heat detection in residential smoke alarms, where one LMT85QDCKTQ1 monitors ambient chamber while another tracks heater coil temperature. IC Role / Device Role / Timing Role: Precision analog temperature reference feeding comparator circuit that triggers alarm at ≥54°C with hysteresis. Use Value: Push-pull output drives comparator input directly without pull-up; ±0.4°C accuracy ensures consistent trip point across production batches and temperature gradients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-output temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMT85DCKRQ1 | Same silicon, identical electrical specs, SC70-5 package; active production status vs. LMT85QDCKTQ1's obsolete status | Identical use cases; preferred for new designs requiring long-term supply continuity and TI's full warranty support | Select LMT85DCKRQ1 for volume production - avoids obsolete part risks while maintaining pin, footprint, and performance equivalence |
| LMT84QDCKRQ1 | Lower sensor gain (−5.5 mV/°C) and wider supply range (1.5–5.5 V); same AEC-Q100 Grade 0 qualification and SC70-5 package | Better suited for ultra-low-voltage systems (<1.8 V) or applications requiring reduced output voltage swing across wide temperature spans | Choose LMT84QDCKRQ1 only if supply voltage dips below 1.8 V or if lower gain improves ADC resolution at high temperatures |
Compared with LMT85QDCKTQ1, LMT85DCKRQ1 offers identical performance with assured long-term availability, while LMT84QDCKRQ1 trades gain for extended low-voltage operation - neither is pin-compatible without verifying board-level biasing and ADC scaling.
Availability
LMT85QDCKTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, powertrain control, and drone thermal management applications requiring stable component supply despite its obsolete status - supported via legacy inventory and cross-qualified alternatives.
Supply support for LMT85QDCKTQ1 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.
The LMT85QDCKTQ1 belongs to TI's LMT8x-Q1 automotive temperature sensor family, engineered specifically for high-reliability, calibration-free thermal monitoring in AEC-Q100 Grade 0 environments - prioritizing accuracy, low power, and robustness over cost or feature count.
FAQ
What is the operating temperature range of the LMT85QDCKTQ1?
The LMT85QDCKTQ1 operates from −50°C to +150°C, with guaranteed ±2.7°C maximum accuracy across this full range. This specification is validated per AEC-Q100 Grade 0 requirements and does not require system-level calibration. At 25°C, typical accuracy is ±0.4°C. The device maintains functionality up to 150°C junction temperature, making it suitable for under-hood automotive applications and industrial equipment monitoring where extreme thermal conditions occur.
Does the LMT85QDCKTQ1 require external calibration for automotive use?
No, the LMT85QDCKTQ1 does not require external calibration for automotive use. It is AEC-Q100 Grade 0 qualified and specified to maintain ±2.7°C maximum accuracy over −50°C to +150°C without calibration. This is achieved through factory-trimmed precision circuitry and process compensation. TI's production test data confirms this performance across lot, temperature, and supply voltage variations - enabling direct integration into infotainment, cluster, and powertrain modules without calibration routines or lookup tables.
Can the LMT85QDCKTQ1 drive an ADC input directly?
Yes, the LMT85QDCKTQ1 can drive an ADC input directly due to its push-pull output stage, which sources and sinks ±50 µA. This capability allows it to charge typical SAR ADC sampling capacitors (e.g., 10–20 pF) without external buffering. For loads ≤1100 pF, no series resistor is needed. When interfacing with high-capacitance or noisy ADC inputs, adding a small filter capacitor (e.g., 1–10 nF) between OUT and GND improves noise rejection while preserving step response.
What is the significance of dual VDD and dual GND pins on the LMT85QDCKTQ1?
The dual VDD (Pins 1 & 4) and dual GND (Pins 2 & 5) configuration on the LMT85QDCKTQ1 reduces power path impedance and improves thermal conduction. Pin 2 is directly connected to the die backside, enabling efficient heat transfer from the sensing junction to the PCB ground plane. Using both GND pins lowers thermal resistance (RθJB = 56°C/W) and minimizes self-heating errors. Dual VDD pins reduce voltage drop under transient load, enhancing output stability during ADC sampling events.
Is the LMT85QDCKTQ1 still recommended for new designs?
No - the LMT85QDCKTQ1 is marked obsolete by Texas Instruments. For new designs, TI recommends the active LMT85DCKRQ1, which shares identical electrical specifications, SC70-5 packaging, and AEC-Q100 qualification. While LMT85QDCKTQ1 remains available through legacy channels, LMT85DCKRQ1 ensures long-term supply, full technical support, and access to updated documentation and simulation models - all critical for automotive production programs with multi-year lifecycles.
LMT85QDCKTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- 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:
- -50°C ~ 150°C
- Operating Temperature:
- -50°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- SC-70
LMT85QDCKTQ1 FAQ
1.How can I place an order for LMT85QDCKTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMT85QDCKTQ1 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 LMT85QDCKTQ1 reliable?
The price and inventory of LMT85QDCKTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMT85QDCKTQ1 is usually 5 days.
3.What payment methods are accepted for LMT85QDCKTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMT85QDCKTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMT85QDCKTQ1?
LMT85QDCKTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMT85QDCKTQ1 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 LMT85QDCKTQ1?
For technical support, including LMT85QDCKTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMT85QDCKTQ1 requirements.
6.How does Aetrix verify that LMT85QDCKTQ1 is sourced from the original manufacturer or authorized distributors?
All LMT85QDCKTQ1 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 LMT85QDCKTQ1 meets industry standards.
7.What is the process for return or replacement of LMT85QDCKTQ1?
All LMT85QDCKTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMT85QDCKTQ1, 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 LMT85QDCKTQ1 part is unused and in its original packaging.
Return procedure for LMT85QDCKTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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