Overview
The LMT85LP is a precision CMOS temperature sensor produced by Texas Instruments. It is characterized by its high accuracy, low power consumption, and wide operating temperature range. The sensor provides a linear analog output voltage that is inversely proportional to temperature, making it suitable for a variety of applications. With its 1.8-V supply voltage operation, 5.4-µA quiescent current, and fast power-on time, the LMT85LP is particularly effective in battery-powered devices such as drones and sensor nodes. It also serves as a cost-effective alternative to thermistors due to its precision and reliability over a broad temperature range.
Key Specifications
| Specification | Value |
|---|---|
| Package | TO-92 (LP), TO-92S (LPG) |
| Pins | 3 |
| Operating Temperature Range | -50°C to 150°C |
| Supply Voltage | 1.8 V |
| Quiescent Current | 5.4 µA |
| Average Sensor Gain | -8.2 mV/°C |
| Typical Accuracy | ±0.4°C |
| Maximum Accuracy | ±2.7°C |
| Power-On Time | 0.7 ms |
| Output Drive Capability | ±50 µA |
| Thermal Time Constant (TO-92S package) | 10 s Typical (1.2 m/s Airflow) |
Key Features
- Very Accurate: ±0.4°C Typical, ±2.7°C Maximum
- Low 1.8-V Operation
- Low 5.4-µA Quiescent Current
- Wide Temperature Range: –50°C to 150°C
- Output is Short-Circuit Protected
- Push-Pull Output With ±50-µA Drive Capability
- Footprint Compatible With the Industry-Standard LM20/19 and LM35 Temperature Sensors
- Cost-Effective Alternative to Thermistors
- Fast Thermal Time Constant in TO-92S Package: 10 s Typical (1.2 m/s Airflow)
Applications
The LMT85LP is suitable for various applications due to its precision, low power consumption, and wide operating temperature range. Key applications include:
- Battery-Powered Devices: Drones, sensor nodes, and other portable electronics benefit from its low power consumption and fast power-on time.
- Smoke and Heat Detectors: The fast thermal time constant of the TO-92S package supports off-board time-temperature sensitive applications.
- Industrial Automation: Its high accuracy and reliability make it a viable option for industrial temperature sensing needs.
- Consumer Electronics: The sensor’s footprint compatibility with industry-standard temperature sensors makes it a convenient choice for various consumer electronics.
Q & A
- What is the typical accuracy of the LMT85LP temperature sensor?
The LMT85LP has a typical accuracy of ±0.4°C. - What is the maximum accuracy of the LMT85LP temperature sensor?
The maximum accuracy is ±2.7°C. - What is the operating temperature range of the LMT85LP?
The operating temperature range is -50°C to 150°C. - What is the supply voltage for the LMT85LP?
The supply voltage is 1.8 V. - What is the quiescent current of the LMT85LP?
The quiescent current is 5.4 µA. - What is the average sensor gain of the LMT85LP?
The average sensor gain is -8.2 mV/°C. - Is the output of the LMT85LP short-circuit protected?
Yes, the output is short-circuit protected. - What is the thermal time constant of the TO-92S package?
The thermal time constant is 10 s Typical (1.2 m/s Airflow). - What are some common applications of the LMT85LP?
Common applications include battery-powered devices, smoke and heat detectors, industrial automation, and consumer electronics. - Is the LMT85LP footprint compatible with other industry-standard temperature sensors?
Yes, it is footprint compatible with the industry-standard LM20/19 and LM35 temperature sensors.
