LM35 Precision Centigrade Temperature SensorThe LM35 series are precision integrated-circuit temperature devices with an output voltage linearly proportional to the Centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. The LM35 device does not require any external calibration or trimming to provide typical accuracies of ±¼°C at room temperature and ±¾°C over a full −55°C to 150°C temperature range. Lower cost is assured by trimming and calibration at the wafer level. The low-output impedance, linear output, and precise inherent calibration of the LM35 device make interfacing to readout or control circuitry especially easy. The device is used with single power supplies, or with plus and minus supplies. As the LM35 device draws only 60 μA from the supply, it has very low self-heating of less than 0.1°C in still air. The LM35 device is rated to operate over a −55°C to 150°C temperature range, while the LM35C device is rated for a −40°C to 110°C range (−10° with improved accuracy).LM35 is a temperature sensor that outputs an analog signal which is proportional to the instantaneous temperature. The output voltage can easily be interpreted to obtain a temperature reading in Celsius. The advantage of lm35 over the thermistor is it does not require any external calibration. The coating also protects it from self-heating. Low cost and greater accuracy make it popular among hobbyists, DIY circuit makers, and students. Many low-end products take advantage of low cost, and greater accuracy and used LM35 in their products. It’s approximately 15 years to its first release but the sensor is still surviving and is used in any products.LM35 can measure from -55 degrees centigrade to 150 degrees centigrade. The accuracy level is very high if operated at optimal temperature and humidity levels. The conversion of the output voltage to centigrade is also easy and straightforward. The input voltage to LM35 can be from 4 volts to 30 volts. It consumes about 60 microamperes of current. Lm35 has many family members a few names are LM35C, LM35CA, LM35D, LM135, LM135A, LM235, and LM335. All LM35 family members work on the same principles but temperature measuring capacity varies and also they are available in many packages (SOIC, TO-220, TO-92, TO ).Specification:Calibrated Directly in Celsius (Centigrade)Output Type: AnalogOperating Voltage: 4 V to 30 VOutput Voltage: 10mV/°CSensitivity: Linear 10 mV/°C Scale FactorLinearity Error: ±1°C (for 0°C to 100°C)Operating Temperature: -55°C to 150°COutput Impedance: 100 ΩPower Consumption: 60 μA (typical)Accuracy: ±1°C (typical)Package Type: TO-920.5°C Ensured Accuracy (at 25°C)Suitable for Remote ApplicationsLow-Cost Due to Wafer-Level TrimmingLow Self-Heating, 0.08°C in Still AirNon-Linearity Only ±¼°C TypicalLow-Impedance Output, 0.1 Ω for 1-mA LoadClick here for the datasheet. Click Sensors for more sensors at best price in BD.
