LM35 - LM35 Precision Centigrade Temperature Sensors...

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LM35 Precision Centigrade Temperature Sensors General Description The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage over linear temperature sensors calibrated in ˚ Kelvin, as the user is not required to subtract a large constant voltage from its output to obtain convenient Centi- grade scaling. The LM35 does not require any external calibration or trimming to provide typical accuracies of ± 1 / 4 ˚C at room temperature and ± 3 / 4 ˚C over a full -55 to +150˚C temperature range. Low cost is assured by trimming and calibration at the wafer level. The LM35’s low output imped- ance, linear output, and precise inherent calibration make interfacing to readout or control circuitry especially easy. It can be used with single power supplies, or with plus and minus supplies. As it draws only 60 μA from its supply, it has very low self-heating, less than 0.1˚C in still air. The LM35 is rated 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 the LM35C, LM35CA, and LM35D are also available in the plastic TO-92 transistor package. The LM35D is also avail- able in an 8-lead surface mount small outline package and a plastic TO-220 package. Features n Calibrated directly in ˚ Celsius (Centigrade) n Linear + 10.0 mV/˚C scale factor n 0.5˚C accuracy guaranteeable (at +25˚C) n Rated for full -55˚ to +150˚C range n Suitable for remote applications n Low cost due to wafer-level trimming n Operates from 4 to 30 volts n Less than 60 μA current drain n Low self-heating, 0.08˚C in still air n Nonlinearity only ± 1 / 4 ˚C typical n Low impedance output, 0.1 for 1 mA load Typical Applications DS005516-3 FIGURE 1. Basic Centigrade Temperature Sensor (+2˚C to +150˚C) DS005516-4 Choose R 1 = -V S /50 μA V OUT =+1,500 mV at +150˚C = +250 mV at +25˚C = -550 mV at -55˚C FIGURE 2. Full-Range Centigrade Temperature Sensor November 2000 LM35 Precision Centigrade Temperature Sensors © 2000 National Semiconductor Corporation DS005516 www.national.com
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Connection Diagrams TO-46 Metal Can Package* DS005516-1 *Case is connected to negative pin (GND) Order Number LM35H, LM35AH, LM35CH, LM35CAH or LM35DH See NS Package Number H03H TO-92 Plastic Package DS005516-2 Order Number LM35CZ, LM35CAZ or LM35DZ See NS Package Number Z03A SO-8 Small Outline Molded Package DS005516-21 N.C. = No Connection Top View Order Number LM35DM See NS Package Number M08A TO-220 Plastic Package* DS005516-24 *Tab is connected to the negative pin (GND). Note: The LM35DT pinout is different than the discontinued LM35DP. Order Number LM35DT See NS Package Number TA03F LM35 www.national.com 2
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Absolute Maximum Ratings (Note 10) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
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