LM135H-MIL

LM135 NSC | Alldatasheet

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n Directly calibrated in ˚Kelvin n 1˚C initial accuracy available n Operates from 400 µA to 5 mA n Less than 1Ω dynamic impedance n Easily calibrated n Wide operating temperature range n 200˚C overrange n Low cost Schematic Diagram DS005698-1 November 2000 LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors © 2000 National Semiconductor Corporation DS005698 www.national.com

Metal Can Package* DS005698-26 *Case is connected to negative pin Bottom View Order Number LM135H, LM135H-MIL, LM235H, LM335H, LM135AH, LM235AH or LM335AH See NS Package Number H03H LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com 2

Absolute Maximum Ratings(Note 4) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Reverse Current 15 mA Forward Current 10 mA Storage Temperature Specified Operating Temp. Range Continuous Intermittent (Note 2) LM135, LM135A −55˚C to +150˚C 150˚C to 200˚C LM235, LM235A −40˚C to +125˚C 125˚C to 150˚C LM335, LM335A −40˚C to +100˚C 100˚C to 125˚C Lead Temp. (Soldering, 10 seconds) Vapor Phase (60 seconds): 215˚C Infrared (15 seconds): 220˚C Temperature Accuracy(Note 1) LM135/LM235, LM135A/LM235A Parameter Conditions LM135A/LM235A LM135/LM235 Units Min Typ Max Min Typ Max Uncalibrated Temperature Error TC = 25˚C, IR = 1 mA 0.5 1 1 3 ˚C Uncalibrated Temperature Error TMIN ≤ TC ≤ TMAX ,IR = 1 mA 1.3 2.7 2 5 ˚C Temperature Error with 25˚C T MIN ≤ TC ≤ TMAX ,IR = 1 mA 0.3 1 0.5 1.5 ˚C Calibration Calibrated Error at Extended T C =T MAX (Intermittent) 2 2 ˚C Temperatures Non-Linearity I R = 1 mA 0.3 0.5 0.3 1 ˚C Temperature Accuracy(Note 1) LM335, LM335A Parameter Conditions LM335A LM335 Units Min Typ Max Min Typ Max Uncalibrated Temperature Error TC = 25˚C, IR = 1 m A 13 26˚ C Uncalibrated Temperature Error TMIN ≤ TC ≤ TMAX ,IR = 1 m A 25 49˚ C Temperature Error with 25˚C T MIN ≤ TC ≤ TMAX ,IR = 1 mA 0.5 1 1 2 ˚C Calibration Calibrated Error at Extended T C =T MAX (Intermittent) 2 2 ˚C Temperatures Non-Linearity I R = 1 mA 0.3 1.5 0.3 1.5 ˚C Electrical Characteristics(Note 1) LM135/LM235 LM335 Parameter Conditions LM135A/LM235A LM335A Units Min Typ Max Min Typ Max Operating Output Voltage 400 µA ≤IR ≤5 mA 2.5 10 3 14 mV Change with Current At Constant Temperature Dynamic Impedance I R =1 mA 0.5 0.6 Ω Output Voltage Temperature +10 +10 mV/˚C Coefficient Time Constant Still Air 80 80 sec 100 ft/Min Air 10 10 sec Stirred Oil 1 1 sec Time Stability T C =125˚C 0.2 0.2 ˚C/khr LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com3

Electrical Characteristics(Note 1) (Continued) Note 1:Accuracy measurements are made in a well-stirred oil bath. For other conditions, self heating must be considered. Note 2:Continuous operation at these temperatures for 10,000 hours for H package and 5,000 hours for Z package may decrease life expectancy of the device. Note 3: Thermal Resistance TO-92 TO-46 SO-8 θJA (junction to ambient) 202˚C/W 400˚C/W 165˚C/W θJC (junction to case) 170˚C/W N/A N/A Note 4:Refer to RETS135H for military specifications. Typical Performance Characteristics Reverse Voltage Change DS005698-27 Calibrated Error DS005698-28 Reverse Characteristics DS005698-29 Response Time DS005698-30 Dynamic Impedance DS005698-31 Noise Voltage DS005698-32 Thermal Resistance Junction to Air DS005698-33 Thermal Time Constant DS005698-34 Thermal Response in Still Air DS005698-35 LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com 4

Typical Performance Characteristics(Continued) Application Hints CALIBRATING THE LM135 Included on the LM135 chip is an easy method of calibrating the device for higher accuracies. A pot connected across the LM135 with the arm tied to the adjustment terminal allows a 1-point calibration of the sensor that corrects for inaccuracy over the full temperature range. This single point calibration works because the output of the LM135 is proportional to absolute temperature with the ex- trapolated output of sensor going to 0V output at 0˚K (−273.15˚C). Errors in output voltage versus temperature are only slope (or scale factor) errors so a slope calibration at one temperature corrects at all temperatures. The output of the device (calibrated or uncalibrated) can be expressed as: where T is the unknown temperature and To is a reference temperature, both expressed in degrees Kelvin. By calibrat- ing the output to read correctly at one temperature the output at all temperatures is correct. Nominally the output is cali- brated at 10 mV/˚K. To insure good sensing accuracy several precautions must be taken. Like any temperature sensing device, self heating can reduce accuracy. The LM135 should be operated at the lowest current suitable for the application. Sufficient current, of course, must be available to drive both the sensor and the calibration pot at the maximum operating temperature as well as any external loads. If the sensor is used in an ambient where the thermal resis- tance is constant, self heating errors can be calibrated out. This is possible if the device is run with a temperature stable current. Heating will then be proportional to zener voltage and therefore temperature. This makes the self heating error proportional to absolute temperature the same as scale factor errors. WATERPROOFING SENSORS Meltable inner core heat shrinkable tubing such as manufac- tured by Raychem can be used to make low-cost waterproof sensors. The LM335 is inserted into the tubing about 1⁄2" from the end and the tubing heated above the melting point of the core. The unfilled 1⁄2" end melts and provides a seal over the device. Typical Applications Thermal Response in Stirred Oil Bath DS005698-36 Forward Characteristics DS005698-37 Basic Temperature Sensor DS005698-2 Calibrated Sensor DS005698-9 *Calibrate for 2.982V at 25˚C Wide Operating Supply DS005698-10 LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com5

Typical Applications(Continued) Minimum Temperature Sensing DS005698-4 Average Temperature Sensing DS005698-18 Remote Temperature Sensing DS005698-19 Wire length for 1˚C error due to wire drop IR =1 mA IR = 0.5 mA* AWG FEET FEET 14 4000 8000 16 2500 5000 18 1600 3200 20 1000 2000 22 625 1250 24 400 800 *For IR = 0.5 mA, the trim pot must be deleted. Isolated Temperature Sensor DS005698-20 LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com 6

Typical Applications(Continued) Simple Temperature Controller DS005698-5 Simple Temperature Control DS005698-21 Ground Referred Fahrenheit Thermometer DS005698-22 *Adjust R2 for 2.554V across LM336. Adjust R1 for correct output. Centigrade Thermometer DS005698-23 *Adjust for 2.7315V at output of LM308 LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com7

Typical Applications(Continued) Fahrenheit Thermometer DS005698-24 *To calibrate adjust R2 for 2.554V across LM336. Adjust R1 for correct output. THERMOCOUPLE COLD JUNCTION COMPENSATION Compensation for Grounded Thermocouple DS005698-6 *Select R3 for proper thermocouple type THERMO- R3 SEEBECK COUPLE ( ±1%) COEFFICIENT J 377 Ω 52.3 µV/˚C T 308 Ω 42.8 µV/˚C K 293 Ω 40.8 µV/˚C S 45.8 Ω 6.4 µV/˚C Adjustments:Compensates for both sensor and resistor tolerances 1. Short LM329B 2. Adjust R1 for Seebeck Coefficient times ambient temperature (in degrees K) across R3. 3. Short LM335 and adjust R2 for voltage across R3 corresponding to thermocouple type J 14.32 mV K 11.17 mV T 11.79 mV S 1.768 mV LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com 8

Typical Applications(Continued) Single Power Supply Cold Junction Compensation DS005698-11 *Select R3 and R4 for thermocouple type THERMO- R3 R4 SEEBECK COUPLE COEFFICIENT J 1.05K 385 Ω 52.3 µV/˚C T 856 Ω 315Ω 42.8 µV/˚C K 816 Ω 300Ω 40.8 µV/˚C S 128 Ω 46.3Ω 6.4 µV/˚C Adjustments: 1. Adjust R1 for the voltage across R3 equal to the Seebeck Coefficient times ambient temperature in degrees Kelvin. 2. Adjust R2 for voltage across R4 corresponding to thermocouple J 14.32 mV T 11.79 mV K 11.17 mV S 1.768 mV LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com9

Typical Applications(Continued) Centigrade Calibrated Thermocouple Thermometer DS005698-12 Terminate thermocouple reference junction in close proximity to LM335. Adjustments: 1. Apply signal in place of thermocouple and adjust R3 for a gain of 245.7. 2. Short non-inverting input of LM308A and output of LM329B to ground. 3. Adjust R1 so that V OUT = 2.982V@ 25˚C. 4. Remove short across LM329B and adjust R2 so that VOUT = 246 mV @ 25˚C. 5. Remove short across thermocouple. Fast Charger for Nickel-Cadmium Batteries DS005698-13 †Adjust D1 to 50 mV greater VZ than D2. Charge terminates on 5˚C temperature rise. Couple D2 to battery. Differential Temperature Sensor DS005698-7 LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com 10

Typical Applications(Continued) Differential Temperature Sensor DS005698-14 Variable Offset Thermometer DS005698-15 †Adjust for zero with sensor at 0˚C and 10T pot set at 0˚C *Adjust for zero output with 10T pot set at 100˚C and sensor at 100˚C Output reads difference between temperature and dial setting of 10T pot LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com11

Typical Applications(Continued) Definition of Terms Operating Output Voltage:The voltage appearing across the positive and negative terminals of the device at specified conditions of operating temperature and current. Uncalibrated Temperature Error:The error between the operating output voltage at 10 mV/˚K and case temperature at specified conditions of current and case temperature. Calibrated Temperature Error:The error between operat- ing output voltage and case temperature at 10 mV/˚K over a temperature range at a specified operating current with the 25˚C error adjusted to zero. Ground Referred Centigrade Thermometer DS005698-16 Air Flow Detector* DS005698-17 *Self heating is used to detect air flow LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com 12

Physical Dimensionsinches (millimeters) unless otherwise noted Metal Can Package (H) Order Number LM135H, LM235H, LM335H, LM135AH, LM235AH or LM335AH 8-Lead Molded Small Outline Package (M) Order Number LM335M LM135/LM235/LM335, LM135A/LM235A/LM335A www.national.com13

Physical Dimensionsinches (millimeters) unless otherwise noted (Continued) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com Plastic Package Order Number LM335Z or LM335AZ LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.