Datasheet LM35

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LM35
SNIS159E – AUGUST 1999 – REVISED JANUARY 2015
LM35 Precision Centigrade Temperature Sensors 1 Features 3 Description
The LM35 series are precision integrated-circuit • Calibrated Directly in Celsius (Centigrade) 1 temperature devices with an output voltage linearly- • Linear + 10-mV/°C Scale Factor proportional to the Centigrade temperature. The • 0.5°C Ensured Accuracy (at 25°C) LM35 device has an advantage over linear • Rated for Full −55°C to 150°C Range temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage • Suitable for Remote Applications from the output to obtain convenient Centigrade • Low-Cost Due to Wafer-Level Trimming scaling. The LM35 device does not require any • Operates from 4 V to 30 V external calibration or trimming to provide typical accuracies of ±¼°C at room temperature and ±¾°C • Less than 60-μA Current Drain over a full −55°C to 150°C temperature range. Lower • Low Self-Heating, 0.08°C in Still Air cost is assured by trimming and calibration at the • Non-Linearity Only ±¼°C Typical wafer level. The low-output impedance, linear output, and precise inherent calibration of the LM35 device • Low-Impedance Output, 0.1 Ω for 1-mA Load makes interfacing to readout or control circuitry especially easy. The device is used with single power
2 Applications
supplies, or with plus and minus supplies. As the • Power Supplies LM35 device draws only 60 μA from the supply, it has • Battery Management 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 • HVAC 150°C temperature range, while the LM35C device is • Appliances 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.
Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM)
TO-CAN (3) 4.699 mm × 4.699 mm TO-92 (3) 4.30 mm × 4.30 mm LM35 SOIC (8) 4.90 mm × 3.91 mm TO-220 (3) 14.986 mm × 10.16 mm (1) For all available packages, see the orderable addendum at the end of the datasheet.
Basic Centigrade Temperature Sensor (2°C to 150°C) Full-Range Centigrade Temperature Sensor
+V +V S S (4 V to 20 V) LM35 VOUT LM35 OUTPUT 0 mV + 10.0 mV/°C R1 tVS Choose R1 = –VS / 50 µA VOUT = 1500 mV at 150°C VOUT = 250 mV at 25°C VOUT = –550 mV at –55°C 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 Electrical Characteristics: LM35A, LM35CA Limits 6.6 Electrical Characteristics: LM35A, LM35CA 6.7 Electrical Characteristics: LM35, LM35C, LM35D Limits 6.8 Electrical Characteristics: LM35, LM35C, LM35D 6.9 Typical Characteristics 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 LM35 Transfer Function 7.4 Device Functional Modes 8 Application and Implementation 8.1 Application Information 8.1.1 Capacitive Drive Capability 8.2 Typical Application 8.2.1 Basic Centigrade Temperature Sensor 8.2.1.1 Design Requirements 8.2.1.2 Detailed Design Procedure 8.2.1.3 Application Curve 8.3 System Examples 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 11 Device and Documentation Support 11.1 Trademarks 11.2 Electrostatic Discharge Caution 11.3 Glossary 12 Mechanical, Packaging, and Orderable Information