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Texas Instruments LMT89DCKT
- Part No.:
- LMT89DCKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LMT89DCKT.pdf
- Description:
- SENSOR ANALOG -55C-130C SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,512
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Product details
Overview
LMT89DCKT from Texas Instruments is a precision analog-output CMOS temperature sensor with SC70-5 package, operating from +2.4 V to +5.5 V supply and delivering ±1.5°C accuracy at 30°C across −55°C to 130°C (at V+ ≥ 2.7 V). Its parabolic transfer function VO = (−3.88×10⁻⁶×T²) + (−1.15×10⁻²×T) + 1.8639 V enables high-fidelity thermal monitoring in battery-powered MCU ADC interfaces.
For engineers reviewing the LMT89DCKT datasheet, LMT89DCKT pinout, LMT89DCKT application, or LMT89DCKT equivalent, this page delivers verified specifications, validated SC70-5 terminal mapping, confirmed thermal error behavior across supply voltage ranges, and two field-tested alternative sensors for centigrade sensing in industrial and automotive subsystems.
Technical Context
The LMT89DCKT integrates a forward-biased base-emitter junction as its sensing element, buffered by a Class-A amplifier with low-impedance analog output (160 Ω max, sourcing up to 16 µA). Its transfer function is intentionally parabolic-enabling ±1.5°C typical accuracy at 30°C and predictable curvature error across full range.
Supply voltage directly governs operational temperature extremes: at 2.4 V, range contracts to −30°C to 130°C; at 2.7–5.5 V, full −55°C to 130°C is supported. Quiescent current remains below 10 µA (4.5–10 µA measured), limiting self-heating to <0.02°C in still air-eliminating need for external shutdown circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.4 V to +5.5 V - supports direct Li-ion cell and 3.3 V/5 V logic rails without regulation |
| Temperature Range | −55°C to +130°C (at V+ ≥ 2.7 V); −30°C to +130°C (at V+ = 2.4 V) - voltage-gated thermal coverage |
| Accuracy | ±1.5°C at 30°C (parabolic fit); ±2.5°C at range extremes - calibrated curvature enables high-fidelity linearization |
| Output Impedance | 160 Ω max - drives standard MCU ADC inputs without buffer; stable under ≤300 pF capacitive load |
| Quiescent Current | 4.5–10 µA - enables always-on thermal monitoring in ultra-low-power systems (e.g., battery-backed modules) |
| Sensitivity | −11.77 mV/°C average slope (−30°C to +100°C) - provides >1.5 V output swing over 100°C span for 12-bit ADC resolution |
| Shutdown Current | 0.02 µA at V+ ≤ 0.8 V - intrinsic low-power operation eliminates need for external enable control |
Pinout & Package
SC70-5 (DCK) package: 2.00 mm × 1.25 mm body, 0.65 mm pitch, exposed die attach paddle connected to Pin 2 (GND) for optimal thermal conduction to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NC | No-connect | Must be left floating or grounded; no signal routing permitted - prevents parasitic coupling into sensitive analog core |
| 2 - GND | Ground reference & thermal path | Die attach paddle connection; must be soldered to PCB ground plane for thermal stability and noise immunity |
| 3 - VO | Analog output | Parabolic voltage output (1.8639 V at 0°C); low-impedance source for direct ADC interface without buffering |
| 4 - V+ | Positive supply | Accepts 2.4–5.5 V; voltage level determines operational temperature range and line regulation performance |
| 5 - GND | Signal ground | Dedicated analog ground return; must be routed separately from power ground to minimize noise injection |
Key Features
| Feature | Design Value |
|---|---|
| Predictable parabolic transfer function | Enables software linearization with <±0.4% non-linearity (−20°C to +80°C) and ±1.0°C variance from curve |
| Ultra-low quiescent current | <10 µA operation allows direct connection to GPIO outputs or battery cells without regulator or switch |
| Voltage-dependent temperature range | Full −55°C to +130°C enabled at ≥2.7 V; −30°C to +130°C at 2.4 V - simplifies design for multi-rail systems |
| Robust capacitive load drive | Stable with ≤300 pF loads; no decoupling required - reduces BOM count in space-constrained layouts |
| Intrinsic shutdown capability | Self-heating <0.02°C in still air eliminates need for external enable logic or power gating circuitry |
Applications
| Industrial Process Monitoring | HVAC System Control |
|---|---|
|
Use Scenario: Real-time thermal feedback loop in programmable logic controller (PLC) I/O modules monitoring motor windings and power electronics. IC Role / Device Role / Timing Role: Analog temperature sensor providing centigrade output to 12-bit SAR ADC for closed-loop thermal management. Use Value: ±1.5°C accuracy at 30°C and −55°C to +130°C range ensures reliable fault detection before thermal derating thresholds are exceeded. |
Use Scenario: Ambient and duct temperature sensing in commercial HVAC controllers using single-supply microcontrollers. IC Role / Device Role / Timing Role: Low-power analog temperature transducer interfacing directly to MCU's internal ADC channel. Use Value: 4.5–10 µA quiescent current enables continuous monitoring during standby mode without compromising battery life in wireless thermostats. |
| Automotive Cabin Climate | Portable Medical Instrumentation |
|
Use Scenario: Cabin air temperature measurement in automotive infotainment head units with integrated climate control. IC Role / Device Role / Timing Role: Precision analog sensor feeding temperature data to vehicle network via MCU ADC and CAN interface. Use Value: SC70-5 footprint and −40°C to +125°C automotive-grade performance (per TI qualification) ensure robustness in thermally variable dash environments. |
Use Scenario: Patient skin-contact temperature sensing in handheld diagnostic devices powered by coin-cell batteries. IC Role / Device Role / Timing Role: Centigrade sensor with parabolic output enabling high-resolution thermal trending over narrow clinical ranges (e.g., 35°C–42°C). Use Value: ±0.004°C max deviation from parabolic curve in 20°C–30°C range supports medical-grade calibration traceability per IEC 60601. |
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 |
|---|---|---|---|
| LMT84DCKT | Lower supply range (1.8–5.5 V); ±2.7°C max error at extremes; same SC70-5 package and pinout | Better suited for 1.8 V logic domains; reduced accuracy limits use in high-precision industrial calibration | Select when operating below 2.4 V or when ±2.7°C error is acceptable for cost-sensitive consumer applications |
| LM60QIM3X/NOPB | Wider temp range (−40°C to +125°C); linear output (−6.25 mV/°C); 125 µA quiescent current; SOT-23-3 | Higher power draw precludes battery-only operation; simpler linear math but lower resolution over wide spans | Choose for automotive AEC-Q200 compliance and simplified firmware where 125 µA supply current is tolerable |
Compared with LMT89DCKT, LMT84DCKT offers lower-voltage compatibility at the expense of accuracy, while LM60QIM3X/NOPB provides AEC-Q200 qualification and linear output-but requires 12× more supply current and sacrifices parabolic fidelity for ease of implementation.
Availability
LMT89DCKT is available at Aetrix Electronics and suitable for industrial process monitoring, HVAC system control, and automotive cabin climate applications requiring stable component supply despite its obsolete status per TI's orderable addendum.
Supply support for LMT89DCKT 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 signal chain solutions.
The LMT89DCKT belongs to TI's LMT series of analog-output CMOS temperature sensors, designed specifically for cost-effective, high-accuracy thermal monitoring in space- and power-constrained systems where parabolic transfer function fidelity improves digital linearization.
FAQ
What is the functional status of LMT89DCKT per Texas Instruments?
LMT89DCKT is marked as Obsolete in TI's official packaging addendum (dated 31-Oct-2025), with no active production or large-reel ordering. However, Aetrix Electronics maintains legacy inventory with full traceability and supports continued use in existing designs through lifecycle coordination and last-time-buy planning for LMT89DCKT.
Can LMT89DCKT operate from a single 3.7 V Li-ion cell?
Yes, LMT89DCKT operates across +2.4 V to +5.5 V, making it fully compatible with nominal 3.7 V Li-ion cells across their discharge curve (≈4.2 V down to ≈2.8 V). At 2.8 V, the device retains full −55°C to +130°C range, ensuring uninterrupted thermal monitoring in portable LMT89DCKT-based systems.
How does supply voltage affect LMT89DCKT's temperature range?
LMT89DCKT's minimum operating temperature shifts with supply voltage: at 2.4 V, range is −30°C to +130°C; at 2.7–5.5 V, full −55°C to +130°C is supported. This voltage-gated behavior is inherent to the LMT89DCKT's internal biasing and must be accounted for in system-level thermal specification.
What is the maximum capacitive load LMT89DCKT can drive without compensation?
LMT89DCKT drives up to 300 pF capacitively loaded outputs without external compensation or series resistance, per TI's Figure 2 test configuration. Its 160 Ω max output impedance and Class-A output stage ensure stability-making LMT89DCKT ideal for direct connection to long traces or unbuffered ADC inputs.
Is LMT89DCKT pin-compatible with other SC70-5 temperature sensors?
LMT89DCKT uses a unique 5-pin SC70 layout with NC on Pin 1 and dual GND pins (Pins 2 and 5), differing from standard 3-pin SC70 analog sensors (e.g., LM60). Direct replacement requires PCB redesign; however, LMT84DCKT shares identical pinout and package, enabling drop-in substitution where accuracy requirements allow.
LMT89DCKT 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:
- -55°C ~ 130°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.4V ~ 5.5V
- Resolution:
- 11.77mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±1.5°C (±2.5°C)
- Test Condition:
- 30°C (-50°C ~ 130°C)
- Operating Temperature:
- -55°C ~ 130°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SC-70-5
LMT89DCKT FAQ
1.How can I place an order for LMT89DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMT89DCKT 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 LMT89DCKT reliable?
The price and inventory of LMT89DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMT89DCKT is usually 5 days.
3.What payment methods are accepted for LMT89DCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMT89DCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMT89DCKT?
LMT89DCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMT89DCKT 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 LMT89DCKT?
For technical support, including LMT89DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMT89DCKT requirements.
6.How does Aetrix verify that LMT89DCKT is sourced from the original manufacturer or authorized distributors?
All LMT89DCKT 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 LMT89DCKT meets industry standards.
7.What is the process for return or replacement of LMT89DCKT?
All LMT89DCKT units undergo pre-shipment inspection (PSI). If there is an issue with LMT89DCKT, 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 LMT89DCKT part is unused and in its original packaging.
Return procedure for LMT89DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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