LM135-LM235-LM335 Precision temperature sensors Features ■ Directly calibrated in °K ■ 1°C initial accuracy TO-92 ■ Operates from 450µA to 5mA (Plastic package) ■ Less than 1Ω dynamic impedance Description The LM135, LM235, LM335 are precision SO-8 temperature sensors which can be easily (Plastic micropackage) calibrated. They operate as a 2-terminal Zener and the breakdown voltage is directly proportional to the absolute temperature at 10mV/°K. Pin connections The circuit has a dynamic impedance of less than 1Ω and operates within a range of current from TO-92 450µA to 5mA without alteration of its (Bottom view) characteristics. Calibrated at +25°C, the LM135, LM235, and ADJ v+ v- LM335 have a typical error of less than 1°C over a 100°C temperature range. Unlike other sensors, the LM135, LM235, LM335 have a linear output. SO-8 (Top view) V+ NC NC ADJ 8 7 6 5 N1C N2C N3C 4V- February 2008 Rev 3 1/16 www.st.com 16

Schematic diagram LM135-LM235-LM335 1 Schematic diagram Figure 1. Schematic diagram 2 Absolute maximum ratings T able 1. Absolute maximum ratings (AMR) LM335- Symbol Parameter LM135 LM235 Unit LM335A Current I R Reverse 15 mA I F Forward 10 Operating free-air temperature range(1) T °C oper Continuous -55 to +150 -40 to +125 -40 to +100 Intermittent +150 to +200 +125 to +150 +100 to +125 T Storage temperature range -65 to +150 °C stg 1. T ≤ 150°C j 2/16

LM135-LM235-LM335 Temperature accuracy 3 Temperature accuracy Table 2. T e mperature accuracy LM135 - LM235 - LM335 LM335A Parameter Unit Min. Typ. Max. Min. Typ. Max. Operating output voltage T = +25°C, I = 1mA 2.95 2.98 3.01 2.92 2.98 3.04 V case R Uncalibrated temperature error (I = 1mA) R T = +25°C 1 3 4 6 °C case T ≤ T ≤ T 2 5 5 9 min case max Temperature error with 25°C calibration T ≤ T ≤ T , I = 1mA min case max. R LM135 - LM235 0.5 1.5 °C LM335 1 2 LM335A 0.5 1 Calibrated error at extended temperature T = T (intermittent) 2 2 °C case max Non-linearity (I = 1mA) R LM135 - LM235 0.3 1 °C LM335 0.3 1.5 LM335A 0.3 1.5 4 Electrical characteristics Table 3. E lectrical characteristics LM135 - LM235 LM335-LM335A Parameter Unit Min. Typ. Max. Min. Typ. Max. Operating output voltage change with current 450µA ≤ I ≤ 5mA at constant temperature 2.5 10 3 14 mV R Dynamic impedance (I = 1mA) 0.5 0.6 Ω R Output voltage temperature drift +10 +10 mV/°C Time constant Still air 80 80 s Air 0.5m/s 10 10 Stirred oil 1 1 Time stability (T = +125°C) 0.2 0.2 °C/kh case Note: Accuracy measurements are made in a well-stirred oil bath. For other conditions, self- heating must be considered 3/16

Electrical characteristics LM135-LM235-LM335 Figure 2. R everse voltage change Figure 3. Calibrated error ) V m e ( C) g ° n ( a r h o c rr ge d e a e volt brat se ali r C e v e R Reverse current (mA) Temperature (°C) Figure 4. Reverse characteristics Figure 5. Response time ) A m V) nt ( g ( e n r wi r u s e c ge s a ever Volt R Reverse voltage (V) Time (µs) Figure 6. D ynamic impedance Figure 7. Noise voltage ) m h O ( e z) c H n √ a V/ d e n mp e ( s c i oi mi N a n y D Frequency (Hz) Frequency (Hz) 4/16

LM135-LM235-LM335 Electrical characteristics Figure 8. T hermal resistance junction to air Figure 9. Thermal time constant ) W C/ ce (° nt (s) n a sta nst si o e c al r me m Ti r e h T Air velocity (m/s) Air velocity (m/s) Figure 10. Thermal response in still air Figure 11. Thermal response in stirred oil bath ) ) % % ( ( e e u u al al v v al al n n of fi of fi nt nt e e c c r r e e P P Time (min) Time (s) F igure 12. Forward characteristics ) V ( e g a olt v d r a w r o F Forward current (mA) 5/16

Application information LM135-LM235-LM335 5 Application information There is an easy method of calibrating the device for higher accuracies (see Typical applications). The single point calibration works because the output of the LM135, LM235, LM335 is proportional to the absolute temperature with the extrapolated output of sensor going to 0V at 0°K (-273.15°C). Errors in output voltage versus temperature are only slope. Thus a calibration of the slope at one temperature corrects errors at all temperatures. The circuit output (calibrated or not) is given by the equation: V + VO x T OT TO ------- To where T is the unknown temperature and To is the reference temperature (in °K). Nominally, the output is calibrated at 10mV/°K. Precautions should be taken to ensure good sensing accuracy. As in the case of all temperatures sensors, self-heating can decrease accuracy. The LM135, LM235, and LM335 should operate with a low current but sufficient to drive the sensor and its calibration circuit to their maximum operating temperature. If the sensor is used in surroundings where the thermal resistance is constant, the errors due to self-heating can be externally calibrated. This is possible if the circuit is biased with a temperature stable current. Heating will then be proportional to Zener voltage and therefore temperature. In this way, the error due to self-heating is proportional to the absolute temperature as scale factor errors. Typical applications Figure 13. Basic temperature sensor Figure 14. Wide operating supply 6/16

LM135-LM235-LM335 Application information Figure 15. C alibrated sensor Figure 16. Average temperature sensing * Calibrated for 2.982V at 25°C Figure 17. Isolated temperature sensor 7/16

Application information LM135-LM235-LM335 Figure 18. Simple temperature controller Figure 19. Centigrade thermometer 8/16

LM135-LM235-LM335 Application information Figure 20. Differential temperature sensor Figure 21. Thermocouple cold junction compensation (compensation for grounded thermocouple) 9/16

Application information LM135-LM235-LM335 Figure 22. Single power supply cold junction compensation 10/16

LM135-LM235-LM335 Package information 6 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. 6.1 TO-92 tape & reel package information Figure 23. TO-92 tape & reel package mechanical drawing A1 P T P H A d 2 H1 H I1 H0 W 0 1 W W 1 L W D0 F1 F2 P2 P0 11/16

Package information LM135-LM235-LM335 T able 4. TO-92 tape & reel package mechanical data Millimeters Inches Dim. Min. Typ. Max. Min. Typ. Max. AL 5.0 0.197 A 5.0 0.197 T 4.0 0.157 d 0.45 0.018 I1 2.5 0.098 P 11.7 12.7 13.7 0.461 0.500 0.539 PO 12.4 12.7 13 0.488 0.500 0.512 P2 5.95 6.35 6.75 0.234 0.250 0.266 F1/F2 2.4 2.5 2.8 0.094 0.098 0.110 Δh -1 0 1 -0.039 0 0.039 ΔP -1 0 1 -0.039 0 0.039 W 17.5 18.0 19.0 0.689 0.709 0.748 W0 5.7 6 6.3 0.224 0.236 0.248 W1 8.5 9 9.75 0.335 0.354 0.384 W2 0.5 0.020 H 20 0.787 H0 15.5 16 16.5 0.610 0.630 0.650 H1 25 0.984 DO 3.8 4.0 4.2 0.150 0.157 0.165 L1 11 0.433 12/16

LM135-LM235-LM335 Package information 6.2 TO-92 bulk package information Figure 24. TO-92 bulk package mechanical drawing T able 5. TO-92 bulk package mechanical data Millimeters Inches Dim. Min. Typ. Max. Min. Typ. Max. L 1.27 0.05 B 3.2 3.7 4.2 0.126 0.1457 0.1654 O1 4.45 5.00 5.2 0.1752 0.1969 0.2047 C 4.58 5.03 5.33 0.1803 0.198 0.2098 K 12.7 0.5 O2 0.407 0.5 0.508 0.016 0.0197 0.02 a 0.35 0.0138 13/16

Package information LM135-LM235-LM335 6.3 SO-8 package information Figure 25. SO-8 package mechanical drawing T able 6. SO-8 package mechanical data Dimensions Ref. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A 1.75 0.069 A1 0.10 0.25 0.004 0.010 A2 1.25 0.049 b 0.28 0.48 0.011 0.019 c 0.17 0.23 0.007 0.010 D 4.80 4.90 5.00 0.189 0.193 0.197 H 5.80 6.00 6.20 0.228 0.236 0.244 E1 3.80 3.90 4.00 0.150 0.154 0.157 e 1.27 0.050 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k 1° 8° 1° 8° ccc 0.10 0.004 14/16

LM135-LM235-LM335 Ordering information 7 Ordering information T able 7. Order codes Temperature Order code Package Packing Marking range LM135Z -55°C to +150°C TO-92 Bulk LM135 LM235D Tube or -40°C to +125°C SO-8 LM235 LM235DT Tape & reel LM235Z -40°C to +125°C TO-92 Bulk LM235 LM335D LM335 LM335DT Tube or -40°C to +100°C SO-8 Tape & reel LM335AD LM335A LM335ADT LM335Z Bulk LM335 LM335AZ -40°C to +100°C TO-92 Bulk or LM335A LM335AZT Tape & reel 8 Revision history T able 8. Document revision history Date Revision Changes 6-May-2003 1 Initial release. Corrected error in pinout diagram for TO-92 package on cover page 13-April-2004 2 (it is a bottom view, not a top view). Updated Section6: Package information and Table7: Order codes. Corrected typical values for uncalibrated temperature error in 11-Feb-2007 3 Table2. Improved quality of electrical characteristics curves. 15/16

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Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: S TMicroelectronics: LM235DT LM235Z LM335AZT LM335Z LM235D LM335DT LM335AD LM335ADT LM335AZ LM335D LM135Z