Overview
The LMT87LP, produced by Texas Instruments, is a precision CMOS temperature sensor designed for a wide range of applications. It features a linear analog output voltage that is inversely proportional to temperature, making it an excellent choice for accurate temperature sensing. The device operates with a low supply voltage of 2.7V to 5.5V and has a quiescent current of 5.4 µA, which is beneficial for power-cycling architectures and battery-powered systems. The LMT87LP is available in several packages, including the TO-92 and TO-92S, which are footprint compatible with industry-standard temperature sensors like the LM20/19 and LM35.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.7 | 5.5 | V | |
| Quiescent Current | 5.4 | µA | ||
| Temperature Range | -50 | 150 | °C | |
| Temperature Accuracy (70°C to 150°C) | -2.7 | ±0.4 | 2.7 | °C |
| Average Sensor Gain | -13.6 | mV/°C | ||
| Output Drive Capability | ±50 | µA | ||
| Thermal Time Constant (TO-92S package, 1.2 m/s airflow) | 10 | s |
Key Features
- Very accurate with a typical temperature accuracy of ±0.4°C
- Low 2.7-V operation with a quiescent current of 5.4 µA
- Average sensor gain of -13.6 mV/°C
- Wide temperature range from -50°C to 150°C
- Output is short-circuit protected
- Push-pull output with ±50-µA drive capability
- Footprint compatible with industry-standard LM20/19 and LM35 temperature sensors
- Cost-effective alternative to thermistors
- Fast thermal time constant in the TO-92S package (10-s typical at 1.2 m/s airflow)
Applications
- Automotive: Infotainment and cluster, powertrain systems
- Smoke and heat detectors
- Drones
- Appliances
- General temperature-sensing applications
Q & A
- What is the operating voltage range of the LMT87LP?
The LMT87LP operates with a supply voltage range of 2.7V to 5.5V. - What is the typical quiescent current of the LMT87LP?
The typical quiescent current is 5.4 µA. - What is the temperature accuracy of the LMT87LP?
The temperature accuracy is typically ±0.4°C. - What is the average sensor gain of the LMT87LP?
The average sensor gain is -13.6 mV/°C. - What is the output drive capability of the LMT87LP?
The output can drive ±50 µA. - Is the output of the LMT87LP short-circuit protected?
Yes, the output is short-circuit protected. - What are the common applications of the LMT87LP?
Common applications include automotive, smoke and heat detectors, drones, appliances, and general temperature-sensing applications. - What packages are available for the LMT87LP?
The LMT87LP is available in TO-92, TO-92S, and SC70 packages. - How does the LMT87LP compare to thermistors?
The LMT87LP is a cost-effective alternative to thermistors with better accuracy and linearity. - What is the thermal time constant of the LMT87LP in the TO-92S package?
The thermal time constant is typically 10 seconds at an airflow of 1.2 m/s.
