Overview
The LM35DZ/LFT7 is a precision integrated-circuit temperature sensor produced by National Semiconductor. This device is part of the LM35 series, which provides an output voltage that is linearly proportional to the Centigrade temperature. The LM35DZ/LFT7 does not require any external calibration or trimming, offering typical accuracies of ±¼°C at room temperature and ±¾°C over a full −55°C to 150°C temperature range for the LM35 series, though the LM35D is specifically rated for 0°C to 100°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Temperature Range | 0 | - | 100 | °C |
| Supply Voltage (+VS) | 4 | - | 30 | V |
| Current Drain | - | 60 | - | μA |
| Accuracy at 25°C | - | ±0.2 | ±0.5 | °C |
| Non-Linearity | - | ±0.18 | ±0.35 | °C |
| Sensor Gain (Average Slope) | - | 10 | - | mV/°C |
| Load Regulation (0 ≤ IL ≤ 1 mA) | - | - | - | - |
| Thermal Resistance (Junction to Ambient) | - | - | 220 | °C/W (SO-8 package) |
Key Features
- Calibrated directly in °C (Centigrade) with a linear +10.0 mV/°C scale factor.
- Low cost due to wafer-level trimming.
- Operates from 4 to 30 volts.
- Low self-heating, less than 0.1°C in still air.
- Low output impedance, 0.1 Ω for 1-mA load.
- Suitable for remote applications.
- Available in various packages including hermetic TO-46, plastic TO-92, and 8-lead surface mount small outline package.
Applications
- Power supplies.
- Battery management.
- HVAC (Heating, Ventilation, and Air Conditioning) systems.
- Appliances.
- Remote temperature sensing.
Q & A
- What is the operating temperature range of the LM35DZ/LFT7? The LM35DZ/LFT7 operates from 0°C to 100°C.
- What is the supply voltage range for the LM35DZ/LFT7? The supply voltage range is from 4 V to 30 V.
- How much current does the LM35DZ/LFT7 draw from the supply? It draws less than 60 μA from the supply.
- What is the accuracy of the LM35DZ/LFT7 at room temperature? The accuracy is typically ±0.2°C at room temperature.
- Does the LM35DZ/LFT7 require external calibration or trimming? No, it does not require any external calibration or trimming.
- What is the thermal resistance of the SO-8 package for the LM35DZ/LFT7? The thermal resistance is 220 °C/W for the SO-8 package.
- In what packages is the LM35DZ/LFT7 available? It is available in hermetic TO-46, plastic TO-92, and 8-lead surface mount small outline packages.
- What are some common applications of the LM35DZ/LFT7? Common applications include power supplies, battery management, HVAC systems, and appliances.
- How does the LM35DZ/LFT7 handle self-heating? It has very low self-heating, less than 0.1°C in still air.
- What is the output impedance of the LM35DZ/LFT7? The output impedance is 0.1 Ω for a 1-mA load.
