Overview
The LM35DZ/LFT2, produced by Texas Instruments, is a precision integrated-circuit temperature sensor. It is calibrated directly in Centigrade (Celsius) and provides an output voltage that is linearly proportional to the temperature. This sensor is part of the LM35 series, known for its high accuracy and ease of use. The LM35DZ/LFT2 does not require external calibration or trimming, making it a convenient choice for various temperature measurement applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Scale Factor | 10 | mV/°C |
| Accuracy at 25°C | ±0.5 | °C |
| Operating Temperature Range | 0 to 100 | °C |
| Supply Voltage Range | 4 to 30 | V |
| Quiescent Current | < 60 | µA |
| Self-Heating in Still Air | < 0.1 | °C |
| Non-Linearity | ±¼ | °C |
| Output Impedance | 0.1 | Ω (for 1-mA load) |
| Package Type | TO-92, 8-lead surface-mount small-outline, TO-220 |
Key Features
- Calibrated Directly in Celsius (Centigrade): No need to subtract a large constant voltage to obtain Centigrade scaling.
- Linear + 10-mV/°C Scale Factor: Output voltage is linearly proportional to the temperature.
- High Accuracy: Ensured accuracy of ±0.5°C at 25°C and ±¾°C over the full temperature range.
- Low Cost: Achieved through wafer-level trimming and calibration.
- Wide Operating Voltage Range: Operates from 4 V to 30 V.
- Low Current Drain: Less than 60 µA.
- Low Self-Heating: Less than 0.1°C in still air.
- Low Non-Linearity: Only ±¼°C typical.
- Low-Impedance Output: 0.1 Ω for a 1-mA load.
Applications
- Power Supplies: For temperature monitoring and control.
- Battery Management: To monitor battery temperature.
- HVAC Systems: For heating, ventilation, and air conditioning systems.
- Appliances: In various household and industrial appliances.
- Remote Applications: Suitable due to its low power consumption and high accuracy.
Q & A
- What is the scale factor of the LM35DZ/LFT2 temperature sensor?
The scale factor is 10 mV/°C.
- What is the accuracy of the LM35DZ/LFT2 at 25°C?
The accuracy is ±0.5°C at 25°C.
- What is the operating temperature range of the LM35DZ/LFT2?
The operating temperature range is from 0°C to 100°C.
- What is the supply voltage range for the LM35DZ/LFT2?
The supply voltage range is from 4 V to 30 V.
- How much current does the LM35DZ/LFT2 typically draw?
The quiescent current is less than 60 µA.
- What is the self-heating of the LM35DZ/LFT2 in still air?
The self-heating is less than 0.1°C in still air.
- What is the non-linearity of the LM35DZ/LFT2?
The non-linearity is only ±¼°C typical.
- What is the output impedance of the LM35DZ/LFT2 for a 1-mA load?
The output impedance is 0.1 Ω for a 1-mA load.
- In what packages is the LM35DZ/LFT2 available?
The LM35DZ/LFT2 is available in TO-92, 8-lead surface-mount small-outline, and TO-220 packages.
- What are some common applications of the LM35DZ/LFT2?
Common applications include power supplies, battery management, HVAC systems, appliances, and remote applications.
