The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has anadvantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a largeconstant voltage from its output to obtain convenient Centi-grade scaling. The LM35 does not require any externalcalibration or trimming to provide typical accuracies of±1⁄4 Cat room temperature and±3⁄4 C over a full −55 to +150 Ctemperature range. Low cost is assured by trimming andcalibration at the wafer level. The LM35's low output imped-ance, linear output, and precise inherent calibration makeinterfacing to readout or control circuitry especially easy. Itcan be used with single power supplies, or with plus andminus supplies. As it draws only 60 μA from its supply, it hasvery low self-heating, less than 0.1 C in still air. The LM35 israted to operate over a −55 to +150 C temperature range,while the LM35C is rated for a −40 to +110 C range (−10 with improved accuracy). The LM35 series is available pack-aged in hermetic TO-46 transistor packages, while theLM35C, LM35CA, and LM35D are also available in theplastic TO-92 transistor package. The LM35D is also avail-able in an 8-lead surface mount small outline package and aplastic TO-220 package.
1.Pin Diagram:
2. Absolute Maximum Ratings:
3. Electrical Characteristics:
• Calibrated directly in Celsius (Centigrade)
• Linear + 10.0 mV/ C scale factor
• 0.5 C accuracy guaranteeable (at +25 C)
• Rated for full −55 to +150 C range
• Suitable for remote applications
• Low cost due to wafer-level trimming
• Low self-heating, 0.08 C in still air
• Nonlinearity only±1⁄4 C typical
• Low impedance output, 0.1Ωfor 1 mA load
• Operates from 4 to 30 volts
• Less than 60 μA current drain
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