Overview
The LM35CAZ/LFT4 is a precision integrated-circuit temperature sensor produced by Texas Instruments. This device is calibrated directly in Celsius, offering a linear output voltage that is proportional to the Centigrade temperature. It is designed for applications requiring precise temperature measurement over a wide range of temperatures.
The LM35CAZ/LFT4 is particularly suited for remote applications due to its low power consumption, calibrated scale factor, and minimal self-heating. The sensor operates from a wide range of power supply voltages (4V to 30V) and has a low current drain of less than 60 μA, making it ideal for battery-powered or energy-limited applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Local sensor accuracy (max) | ±0.5 | °C (at 25°C) |
| Operating temperature range | -55 to 150, -40 to 110, 0 to 100 | °C |
| Supply voltage (min) | 4 | V |
| Supply voltage (max) | 30 | V |
| Supply current (max) | 114 | μA |
| Interface type | Analog output | |
| Sensor gain | 10 | mV/°C |
| Self-heating | 0.08 | °C (in still air) |
| Output impedance | 0.1 | Ω (for 1-mA load) |
| Package | TO-92 (LP)-3 |
Key Features
- Calibrated Directly in Celsius (Centigrade): Eliminates the need for conversion calculations.
- Linear + 10-mV/°C Scale Factor: Provides a linear temperature measurement.
- High Accuracy: Ensured accuracy of ±0.5°C at 25°C and ±¾°C over the full temperature range.
- Wide Operating Temperature Range: Rated for -55°C to 150°C, with specific models rated for -40°C to 110°C and 0°C to 100°C.
- Suitable for Remote Applications: Low power consumption and calibrated scale factor make it ideal for remote temperature measurement.
- Low-Cost Due to Wafer-Level Trimming: Reduces costs while maintaining accuracy and reliability.
- Flexible Power Supply Range: Operates from 4V to 30V.
- Low Current Drain: Less than 60 μA, suitable for battery-powered applications.
- Low Self-Heating: Minimal self-heating of 0.08°C in still air.
- Low Non-Linearity: Typical non-linearity of ±¼°C.
- Low-Impedance Output: 0.1 Ω for a 1-mA load, facilitating easy connection to external electronics.
Applications
- Power Supplies: For temperature monitoring and control in power supply systems.
- Battery Management: To monitor battery temperature in various battery-powered devices.
- HVAC (Heating, Ventilation, and Air Conditioning): For temperature control and monitoring in HVAC systems.
- Appliances: Used in various household and industrial appliances for temperature sensing and control.
- Remote Applications: Ideal for remote temperature measurement due to its low power consumption and calibrated scale factor.
Q & A
- What is the operating temperature range of the LM35CAZ/LFT4?
The LM35CAZ/LFT4 operates over a temperature range of -55°C to 150°C, with specific models rated for -40°C to 110°C and 0°C to 100°C.
- What is the sensor gain of the LM35CAZ/LFT4?
The sensor gain is 10 mV/°C.
- What is the typical accuracy of the LM35CAZ/LFT4 at room temperature?
The typical accuracy at 25°C is ±0.5°C.
- What is the maximum supply current of the LM35CAZ/LFT4?
The maximum supply current is 114 μA.
- What is the output impedance of the LM35CAZ/LFT4 for a 1-mA load?
The output impedance is 0.1 Ω for a 1-mA load.
- What is the self-heating of the LM35CAZ/LFT4 in still air?
The self-heating is minimal at 0.08°C in still air.
- What is the package type of the LM35CAZ/LFT4?
The package type is TO-92 (LP)-3.
- Can the LM35CAZ/LFT4 be used in remote applications?
Yes, it is suitable for remote applications due to its low power consumption and calibrated scale factor.
- What is the non-linearity of the LM35CAZ/LFT4?
The typical non-linearity is ±¼°C.
- What are some common applications of the LM35CAZ/LFT4?
Common applications include power supplies, battery management, HVAC systems, and various household and industrial appliances.
