AS35

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Precision Centigrade Temperature Sensor

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Linear +10.0mv/°C Scale Factor © 0.5°C Accuracy Guaranteeable (at +25°C) © Calibrated Directly In ° Celsius (Centigrade) © Operates From 4V to 30V © Less Than 602A Current Drain © Nonlinearity Only +1/4°C Typical ¢ Low Impedance Output, 0.1 Q For Ima Load © Rated For Full -55°C To +150°C Range © Similar Replacement For LM35 PRODUCT DESCRIPTION The ALPHA Semiconductor AS35 is a Precision Integrated-Circuit Temperature Sensor. It's output voltage is linearly proportional to Celsius (Centigrade) temperature. Trimming and calibration at the wafer level assures low cost and provides typical accuracy of +3/4°C over a full -55°C to +150°C temperature range. Due to the AS35's low output impedance, linear output, and precise inherent calibration, interfacing to readout or control circuitry is especially easy. It can be used with single power supplies, or with plus and minus supplies. ORDERING INFORMATION PIN CONNECTIONS SOIC SOT-89 TO-92 TO-46 Oper. Temp. 8-PIN 3-PIN 3-PIN Range SOT-89 po A357] 55°C 10 +150°C po AS 35aT T -55°C to +150°C ALPHA pT AS35€7 | -40°C to +110°C sas AS35CS_| AS35SCM1 | AS3S5CN_| AS35CAT | -40°C to +110°C AS35DS AS35DN °C to +100°C Vo GND Ve AS35FS_| AS35FM1 | AS3SFN | AS3SFT O°C to +100°C Front View 8-Pin Surface Mount Your ube TO-46 1 Metal Can Package TO-92 Nc mabe ALPHA weed 483 Enc Oy San Se. xp ps} xc Gxp® 4 GND . Vour Top View Bottom View Bottom View Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1391 Rev. 1/27/99

Output Voltage ...ceeecsccccsesseesssessseeeeeeeetOV tO -1.0V AGS35 ceccssscsssssssssessssssesssssssssssessstssssessesetsssseseesseeeeS5°C 10 +150°C Output Current... eeesseesesseseesesseseeseseesees LOMA, AS35B wuscesseseeseesssseesessessesssssessessssesssssessesseserseseeseese 40°C to +1 10°C ‘Temperature rise of AS35 due to self-heating (Thermal Resistance) To-46 TO-46 T0-92 TO-92 No Heat Sink Small Heat Fin No Heat Sink No Heat Sink Still air 400°C/W 100°C/W 180°C(W 140°C/W Moving air 100°C/W 40°C 90°C/W TO°CIW Still oil 100°C/W 40°C/W 90°C/W 70°CIW Stirred oil 50°C/W 30°C/W 45°CIW 40°c/W (Clamped to metal, infinite heat sink) (24°C) ELECTRICAL CHARACTERISTICS (Note 1) (Note 5) a i PPP Pd Min Typ Max | Min Typ _ Max (Note 6) Ta=-10°C 40.3 +0.3 °C TminsTasTmax +0.8 40.8 °C [ Nonlinearity (Nowe 7) | TminsTastmax | 0.8 | TP sos TT °c_| Eh (Average Slope) 1 mV/°C foatcmanoey ———tnercrnms | fans | Ts [P| O<IL<ImA_ (Note 3) TminsTasTmax 40.5 +0.5 A fae teractions | 2 fas | [Sata os | (Note 3) TminsTasTmax +0.02_| 0.05 +0.02 | 0.05_ | mV/V Quiescent Current Vs=+5V, +25°C 56 67 56 67 pA (Note 8) Vs=+5SV 105 91 pA Vs=+30V, +25°C 56.2 | 68 56.2 | 68 HA Vs=+30V 105.5 91.5 A foo we even | dos | | ds | a (Note 3) AVSVss30V 0.5 0.5 A En la Quiescent Current EA A ll for Rated Accurac [Long Term Stability | Tie Tmax, for 1000hours Tf 40.08 TT 0.08 cd Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1391 Rev. 1/27/99

ELECTRICAL CHARACTERISTICS (NOTE 1) (NOTE 5) AS35C AS35D AS35 AS35F PARAMETER CONDITIONS Min, ‘Typ. Max Min. Typ. Max, _ [UNITS ‘Accuracy, AS35, AS35C Ta=+25°C 204 | 41.0 204 Cc (ote 6) Ta=-10°C 405 405 *c ‘Tmin<TasTmax 408 | 415 408 | +10 °C ‘Recuracy, AS35D Ta=425°C 206 c (Note 6) ‘Tmin<TasTmax 209 | 415 °C ‘Accuracy, AS35F Ta=+25°C 206 co (ote 6) ‘Tmin<TasTmax +15 ES) Cc Line Regulation (Note 3) Ta=25°C 20.01 001 | 201 | mvvV 4VSVss30V 40.02 40.02 mvV/V Load Regulation OSILSImA Ta=#25°C m4 [220 204 | 220 | mvimA Note 3) ‘TminsTasTmax 20.5 205 mV/mA, Load Regulation OSILSImA, AS35F ONLY | Ta=+25°C 204 | 30 | mvima (ote 3) ‘TminsTasTmax 415 mV/mA Quiescent Current Vs=45V, 425°C 36 80 36 80 HA (Note 8) Vs=+5V 105 91 HA Vs=+30V, +25°C 56.2 82 56.2 82 pA Vs=+30V 105.5 os A ‘Change of Quiescent Current AVEVSS30V, 425°C 02 | 20 02 20 A (Note 3) 4V<Vs<30V 05 05 pA “Temperature Coefficient of 039 0.39 HAC uiescent Current ‘Minimum Temperature for +15 +15 °C Rated Accurac “Minimum Temperature for $3.0 ca Rated Accuracy, AS35E. Note |: Unless otherwise noted, these specifications apply: -55°CSTjS150°C for the AS35 and AS35A; -40°STjS-1 10°C for the AS35C and AS35CA; OSTJ$+100°C for the AS35D. Vs=+5Vde and lload=50mA. in the circuit of Figure 2. ‘These specifications also apply from +2°C to ‘Tmax in the circuit of Figure 1. Note 2: Thermal resistance of the TO-46 package is 440°C/W, junction to ambient, and 24°C/W junction to case. Thermal resistance of the TO-92, package is |80°C/W junction to ambient. ‘Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance. Note 4: Tested limits are guaranteed and 100% tested in production. ‘Note 5: Specifications in boldface apply over the full rated temperature range. Note 6: Accuracy is defined as the error between the output voltage and 1Omv/°C times the device's case temperature, at specified conditions of voltage, current, and temperature (expressed in °C). Note 7; Nonlinearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the device's rated temperature range. Note 8: Quiescent current is defined in the circuit of Figure 1 Note 9: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. See Note | Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1391 Rev. 1/27/99

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APPLICATIONS

The AS35 should be applied easily in the same way as other The AS35 wiring should be kept insulated and dry to avoid temperature sensors. It is can be cemented or glued to a any leakage and corrosion especially in cold temperatures surface and its temperature will be within about 0.01 °C of the where condensation can occur. Printed circuit board surface temperature. In the case of the temperature being coatings with epoxy paints, humiseal or dips are often used higher or lower than the surface temperature , the AS35 to insure against moisture corrosion. temperature would be at an intermediate temperature between This device can also be soldered to a small heat fan to the surface and air temperature. This should be taken into decrease the thermal time constant and speed up the consideration with the TO-92 and plastic packages especially. response slowly-moving air. If the wiring to the AS35 is held at the same temperature as CAPACITIVE LOADS the surface of interest then this can minimize the above The AS35 is limited to a capacitive load of up to 50 pf problem. The wire should be covered with some epoxy to without any precautions. The below figure will show if a insure that the temperature stays the same and that the AS35S’s heavier load is used it can be isolated or decoupled with a die temperature will not be affected by the air temperature. resistor. The tolerance of capacitance can be improved (as The AS35 in the TO-46 package can also be soldered to a the below figure shows) with a series R-C damper metal surface without any damage. The negative supply needs connected from output to ground. to be grounded to the metal. This device can be mounted inside a sealed-end metal tube, and can then be dipped into a Other figures in this section covers different application bath or screwed into a threaded hole in a tank. uses of AS35. THE TEMPERATURE RISE OF AS35 ( Self heating by this device ) Paine ein | lon [ante | wie [te] Small Heat Sink | Small Heat Fin No Heat Sink Small Heat Fin No Heat Sink Small Heat Fin Still air CCW) [iso fot T0000 Movingair CCW) [900 Tt tot Still oil CCIW) [oto Stirred of CCW) T4580 TYPICAL APPLICATION CIRCUITS # TERT ESTEE TENE TI ATS : a 3 TERA) REPRORIVE LEE, WADIR SFE ™ Y = rE CONORAL PS t Fa es R-C Damper ~~~ Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1301 Fax: (925)417-1391 Rev. 1/27/99

TYPICAL APPLICATION CIRCUIT 4¥s (coches 37 some 5 (ov 10 Zev) Z soe 1 A eno 2 TED wn 1 mm a te 1 me bane 2 Vout 8 ZS Tams 10°C} FROM =$°E ao aE 18k 20 the he Nour = +1 er = i Two-Wire Remote Temperature Sensor AS38S-4.2 (Output Referred to Ground) ‘ td Fahrenheit Thermometer ; ay Weems et Et : ve Fi toe ate" , ~ : HEAT 2S <3 na - i A 08 > FRSTED PRR . : = oa Wet Co] ASSIS N. : g 20 - TASTED Pep : ts " 1 : (08 1a FRERSTAT = a i RARER AIEEE Two-Wire Remote Temperature Sensor i Two-Wire Remote Temperature Sensor (Grounded Sensor} i (Output Reterrad to Ground} Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1391 Rev. 1/27/99

TYPICAL APPLICATION CIRCUIT w rs oe ee btn —T}- eh cLotK 508 eNaE = Temperature Sensar, Single Supply, 55° to nD + 160°C Temperature To Digital Converter (Serial Output) {+ 126°C Full Scale) wv tk —-T1 ‘our ‘N28 l AS35 I A —— +4 = | 2 4 0.01 uF 12k 100k fea 0.01 nF a7 s 5k ‘LOWTEMPCO. Voltage-To-Frequency Converter And Isolated Output (2°C to + 150°C; 20 Hz to 1500 Hz) Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1391 Rev. 1/27/99