LM35
- Calibrated Directly in Celsius (Centigrade)
- Linear + 10-mV/°C Scale Factor
- 0.5°C Ensured Accuracy (at 25°C)
- Rated for Full −55°C to 150°C Range
- Suitable for Remote Applications
- Low-Cost Due to Wafer-Level Trimming
- Operates From 4 V to 30 V
- Less Than 60-µA Current Drain
- Low Self-Heating, 0.08°C in Still Air
- Non-Linearity Only ±¼°C Typical
- Low-Impedance Output, 0.1 Ω for 1-mA Load
The 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 makes 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). The LM35-series devices are available packaged in hermetic TO transistor packages, while the LM35C, LM35CA, and LM35D devices are available in the plastic TO-92 transistor package. The LM35D device is available in an 8-lead surface-mount small-outline package and a plastic TO-220 package.
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Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | LM35 Precision Centigrade Temperature Sensors datasheet (Rev. H) | PDF | HTML | 21 Dec 2017 |
Circuit design | Low-input bias-current front end SAR ADC circuit (Rev. B) | PDF | HTML | 24 Sep 2024 | |
Application note | Temperature sensors: PCB guidelines for surface mount devices (Rev. A) | 18 Jan 2019 | ||
Certificate | UL Certificate of Compliance Vol1-Sec14 E232195 | 06 Aug 2018 | ||
Technical article | What are you sensing? Pros and cons of four temperature sensor types | PDF | HTML | 26 Aug 2015 | |
Application note | Thermocouple, Cold-Junction Compensation—Analog Approach | 27 Aug 2014 | ||
Application note | AN-1852 Designing With pH Electrodes (Rev. A) | 01 May 2013 | ||
Application note | AN-460 LM34/LM35 Precision Monolithic Temperature Sensors (Rev. C) | 01 May 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
TIDA-01576 — High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling ADC
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
SOIC (D) | 8 | Ultra Librarian |
TO-220 (NEB) | 3 | Ultra Librarian |
TO-92 (LP) | 3 | Ultra Librarian |
TO-CAN (NDV) | 3 | Ultra Librarian |
Ordering & quality
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