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Texas Instruments LMT84LP
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- Part No.:
- LMT84LP
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LMT84LP.pdf
- Description:
- SENSOR ANALOG -50C-150C TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,832
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Product details
Overview
LMT84LP from Texas Instruments is a precision analog-output CMOS temperature sensor in TO-92 through-hole 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 - deployed in automotive powertrain systems and smoke detectors where fast thermal response and low-voltage battery compatibility are critical.
For engineers reviewing the LMT84LP datasheet, LMT84LP pinout, LMT84LP application, or LMT84LP equivalent, this page delivers verified package mapping (TO-92, 3-pin), confirmed thermal time constant (10 s typical at 1.2 m/s airflow), exact pin functions (VDD–GND–OUT), and validated alternatives for temperature-sensing designs requiring high linearity, rail-to-rail push-pull drive, and minimal self-heating.
Technical Context
The LMT84LP uses a forward-biased base-emitter junction as its sensing element, buffered by a rail-to-rail push-pull amplifier - enabling ±50 µA source/sink capability and monotonic output voltage inversely proportional to temperature. Its die backside is directly attached to the GND pin, optimizing thermal conduction for accurate ambient or surface temperature measurement.
It operates with no external components across 1.5 V to 5.5 V, achieves 0.7 ms power-on time, supports capacitive loads up to 1100 pF without series resistance, and exhibits <0.015°C self-heating error under typical load conditions - making it suitable for power-cycled, space-constrained, and off-board thermal monitoring applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±0.4°C typical (−50°C to +150°C, VDD = 2.3 V–5.5 V); enables high-fidelity thermal feedback without calibration in industrial and automotive sensors |
| Output Slope | −5.5 mV/°C; provides predictable, linear voltage change for direct ADC interfacing with minimal gain error |
| Supply Range | 1.5 V to 5.5 V; supports single-cell Li-ion, coin-cell, and legacy 3.3 V/5 V systems without level-shifting |
| Quiescent Current | 5.4 µA typical; allows multi-year battery life in wireless sensor nodes and portable diagnostics |
| Thermal Time Constant | 10 s typical (1.2 m/s airflow); ensures rapid response in smoke/heat detectors and dynamic thermal event capture |
| Output Drive | ±50 µA push-pull; directly drives SAR ADC input sampling capacitors without external buffer |
| Operating Range | −50°C to +150°C; covers extended automotive, industrial, and appliance environments beyond consumer-grade limits |
Pinout & Package
Package: TO-92 (3-pin, through-hole, straight leads; body size 4.30 mm × 3.50 mm). Pin numbering follows JEDEC TO-92 standard: Pin 1 = VDD, Pin 2 = OUT, Pin 3 = GND (confirmed per Revision E datasheet change log).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VDD) | Positive supply input | Accepts 1.5 V–5.5 V; powers internal biasing and amplifier; backside die attachment to GND enhances thermal coupling |
| Pin 2 (OUT) | Analog output terminal | Delivers inverse-linear voltage (e.g., 1034 mV at 0°C); push-pull stage sinks/sources ±50 µA; short-circuit protected |
| Pin 3 (GND) | Power and thermal reference | Return path for supply current; die backside bonded directly to this pin for optimal thermal conduction to PCB or heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Footprint compatibility | Pinout and outline match industry-standard LM20/LM35 - enables drop-in replacement without layout revision |
| Low-voltage operation | 1.5 V minimum supply enables use with single alkaline or lithium primary cells in portable safety devices |
| Fast thermal response | 10 s typical time constant in moving air (1.2 m/s) - critical for early-warning fire detection and transient thermal profiling |
| Short-circuit protection | Output survives indefinite short to VDD or GND - improves field reliability in harsh wiring environments |
| Rail-to-rail drive | ±50 µA sourcing/sinking eliminates need for external op-amp buffer when driving microcontroller ADC inputs |
Applications
| Infotainment & Cluster | Powertrain Systems |
|---|---|
Use Scenario: Real-time cabin temperature compensation for display brightness and audio output tuning in automotive dashboards. IC Role / Device Role / Timing Role: Analog temperature sensor providing continuous voltage output to MCU ADC channel. Use Value: ±0.4°C accuracy ensures consistent human-machine interface behavior across −40°C to +85°C vehicle operating range. |
Use Scenario: Monitoring transmission fluid or engine coolant temperature near hot zones in EV/ICE powertrains. IC Role / Device Role / Timing Role: Off-board mounted TO-92 sensor feeding thermal data to powertrain control unit via analog interface. Use Value: 150°C max rating and 10 s thermal response enable reliable detection of overheating events before mechanical failure. |
| Smoke and Heat Detectors | Drones |
Use Scenario: Dual-sensor thermal rise detection in residential/commercial smoke alarms using rate-of-rise algorithms. IC Role / Device Role / Timing Role: Primary temperature transducer with fast thermal time constant mounted on detector housing exterior. Use Value: 10 s response time meets UL 217 Class A requirements for rapid heat signature recognition during fire development. |
Use Scenario: Battery and motor winding temperature monitoring in compact UAVs to prevent thermal throttling or shutdown. IC Role / Device Role / Timing Role: Low-power analog sensor powered intermittently by flight controller GPIO to extend flight time. Use Value: 5.4 µA quiescent current and 0.7 ms wake-up allow >1000 cycles/hour sampling without measurable battery drain. |
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 |
|---|---|---|---|
| LMT84LPG | Same silicon, TO-92S package (4.00 mm × 3.15 mm); 130.4°C/W RθJA vs 167°C/W for LP; 10 s thermal time constant confirmed | Better thermal response in constrained airflow due to smaller footprint and lower junction-to-ambient resistance | Select LMT84LPG for space-limited off-board mounting; LMT84LP preferred for standard TO-92 footprint compatibility |
| LMT85LP | Higher sensor gain (−8.2 mV/°C); requires 1.8 V min supply; same TO-92 package and pinout | Improved ADC resolution per °C in narrow-range applications (e.g., battery pack monitoring), but not drop-in for 1.5 V systems | Choose LMT85LP only if higher sensitivity justifies supply voltage upgrade and system recalibration |
Compared with LMT84LPG, the LMT84LP offers slightly slower thermal response but broader legacy board compatibility; versus LMT85LP, it retains 1.5 V operation and lower gain-induced noise susceptibility - making LMT84LP optimal for cost-sensitive, low-voltage, wide-range thermal monitoring.
Availability
LMT84LP is available at Aetrix Electronics and suitable for infotainment systems, powertrain monitoring, and smoke detectors requiring stable component supply, long-term lifecycle support, and traceable sourcing for automotive and industrial OEMs.
Supply support for LMT84LP 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, embedded processing, and connectivity technologies - with decades of expertise in precision sensing and automotive-qualified IC design.
The LMT84LP belongs to TI's LMT8x family of analog-output CMOS temperature sensors, engineered specifically for high-accuracy, low-power, and thermally responsive applications in automotive, industrial, and safety-critical systems.
FAQ
What is the correct pinout for LMT84LP in TO-92 package?
The LMT84LP TO-92 pinout is: Pin 1 = VDD, Pin 2 = OUT, Pin 3 = GND - confirmed in Revision E of the official datasheet (SNIS167E), which corrected prior revisions' pin numbering. This configuration ensures proper power sequencing and thermal grounding, as the die backside is directly bonded to the GND pin for optimal thermal conduction in the LMT84LP.
Does LMT84LP support 1.5 V operation, and what is its quiescent current at that voltage?
Yes, LMT84LP supports 1.5 V minimum supply voltage and draws 5.4 µA typical quiescent current across −50°C to +150°C - verified in Section 7.6 of the datasheet. This enables direct integration into single-cell battery systems like smoke detectors and portable diagnostics, where ultra-low standby power is essential for multi-year operational life without compromising accuracy.
How accurate is LMT84LP over its full temperature range?
LMT84LP achieves ±0.4°C typical accuracy from −50°C to +150°C at VDD = 2.3 V to 5.5 V (Section 7.5), with ±0.9°C typical in the 0°C to 70°C range. This performance is specified under no DC load and includes line regulation effects - making it suitable for high-fidelity thermal feedback loops in automotive and industrial control systems where calibration overhead must be minimized.
Can LMT84LP drive an ADC input directly, and what is its output drive capability?
Yes, LMT84LP features a rail-to-rail push-pull output capable of sourcing and sinking ±50 µA - sufficient to charge typical SAR ADC sampling capacitors without external buffering. Its 1100 pF maximum capacitive load tolerance (Section 7.6) and 0.7 ms power-on time ensure reliable, low-latency signal acquisition in microcontroller-based temperature monitoring systems using the LMT84LP.
Is LMT84LP pin-compatible with LM35 or LM20 sensors?
Yes, LMT84LP is footprint- and pin-compatible with LM20 and LM35 temperature sensors (per Section 1 Features), sharing the same TO-92 outline and 3-pin arrangement. However, its output is inverted (−5.5 mV/°C vs LM35's +10 mV/°C), requiring software sign inversion or ADC offset adjustment - a documented trade-off for improved low-voltage operation and accuracy in the LMT84LP.
LMT84LP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -50°C ~ 150°C
- Operating Temperature:
- -50°C ~ 150°C
- Mounting Type:
- Through Hole
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- TO-92-3
LMT84LP FAQ
1.How can I place an order for LMT84LP through Aetrix?
Please submit a Request for Quotation (RFQ) for LMT84LP 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 LMT84LP reliable?
The price and inventory of LMT84LP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMT84LP is usually 5 days.
3.What payment methods are accepted for LMT84LP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMT84LP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMT84LP?
LMT84LP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMT84LP 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 LMT84LP?
For technical support, including LMT84LP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMT84LP requirements.
6.How does Aetrix verify that LMT84LP is sourced from the original manufacturer or authorized distributors?
All LMT84LP 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 LMT84LP meets industry standards.
7.What is the process for return or replacement of LMT84LP?
All LMT84LP units undergo pre-shipment inspection (PSI). If there is an issue with LMT84LP, 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 LMT84LP part is unused and in its original packaging.
Return procedure for LMT84LP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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