M, C, T Vishay Dale NTC Thermistors,Coated FEATURES * Small size - conformally coated. * Wide resistance range. * Available in 11 different R-T curves. DESCRIPTION Models M, C, and T are conformally coated, leaded thermistors for standard PC board mounting or assembly in probes. The coating is baked-on phenolic for durability and long-term stability. Models M and C have tinned solid copper leads. Model T has solid nickel wires with Teflon(R) insulation to provide isolation when assembled in metal probes or housings. DIMENSIONS in inches [millimeters] TEFLON INSULATED NICKEL WIRE TINNED COPPER WIRE BODY DIA. MAX. 1/4 NOM. BODY DIA. MAX. 24 0.5 [609.6 12.7] 1.5 [36.1] MIN. CLEAN LEAD LENGTH LD DIAMETER WIRE SIZE Type M AWG 30: 0.0100 [0.254] Type C AWG 28: 0.0126 [0.320] Type T AWG 30: 0.0100 [0.254] ORDERING INFORMATION 1 C 2001 F CURVE NUMBER MODEL VALUE TOLERANCE First three digits are significant. The last digit is the multiplier. (2000 ohm is illustrated.) Point Match Tolerances F = 1% @ 25C G = 2% @ 25C H = 3% @ 25C J = 5% @ 25C K = 10% @ 25C See following pages for Tolerance explanation and details www.vishay.com 18 For technical questions, contact thermistor1@vishay.com Curve Track Tolerances A3 = 1C 0C to + 70C B3 = 0.5C 0C to + 70C C3 = 0.2C 0C to + 70C A2 = 1C - 20C to + 50C B2 = 0.5C - 20C to + 50C C2 = 0.2C - 20C to + 50C A4 = 1C 0C to + 100C B4 = 0.5C 0C to + 100C A5 = 1C + 25C to + 90C B5 = 0.5C + 25C to + 90C C5 = 0.2C + 25C to + 90C A8 = 1C 0C to + 50C B8 = 0.5C 0C to + 50C C8 = 0.2C 0C to + 50C Document Number: 33003 Revision 11-Feb-02 M, C, T NTC Thermistors, Coated Vishay Dale SELECTION GUIDE FOR TYPE M, C, AND T THERMISTORS R25 (Ohms) CURVE NUMBER 1 2 27 33 50 56 68 82 100 120 150 180 220 270 330 390 470 500 560 680 820 1K 1.2K 1.5K 1.8K 2.2K 2.7K 3.3K 3.9K 4.7K 5K 5.6K 6.8K 8.2K 10K 12K 15K 18K 22K 27K 33K 39K 47K 50K 56K 68K 82K 100K 120K 150K 180K 220K 270K 330K 390K 470K 500K 560K 680K 820K 1 Meg Document Number: 33003 Revision 11-Feb-02 3 4 7 8 9 12 14 17 MAXIMUM BODY DIAMETER 0.125 [3.2] 0.110 [2.8] 0.095 [2.4] DISSIPATION CONSTANT 2 - 3 mWatts/C THERMAL TIME CONSTANT 6 - 14 Seconds NOTE: 1. Intermediate resistance values between the standard value series are available. Size would be the same as the color grouping. 2. Other body diameters available. Bead diameter increases as Res. decreases. (Consult Factory) 3. Leaded series of thermistors includes additional styles: (Consult Factory) Type B: Type F: Type E: Type D: Type G: Type H: For technical questions, contact thermistor1@vishay.com 26AWG lead, .0159 [.40] 32AWG lead, .008 [ .20] 24AWG lead, .020 [ .51] 22AWG lead, .025 [.64] 20AWG lead, .032 [ .81] 18AWG lead, .040 [1.02] www.vishay.com 19 M, C, T Vishay Dale NTC Thermistors, Coated TOLERANCES AVAILABLE FOR TYPE M, C AND T THERMISTORS Description of Thermistor Tolerances The many applications of thermistors have mandated the need for two basic tolerance schemes for these products - Curve Tracking and Point Match Thermistors. An example of the resistance tolerance at various temperatures for the two different tolerancing methods is described in the following graph: 5% POINT MATCH CURVE 10 9 TOLERANCE ( %) 8 7 25C 6 1C CURVE TRACK CURVE 5 4 A2 3 A8 A3 2 A4 1 150 130 140 120 110 100 90 70 80 60 40 30 10 20 0 - 20 - 10 - 30 - 50 - 40 50 A5 0 TEMPERATURE (C) Curve Tracking Tolerance: Thermistors are calibrated at the high temperature of the curve track range and then final tested at the low temperature of the curve track range. This ensures that the thermistor will meet the specified temperature accuracy at every temperature within the desired temperature range. Several temperature ranges are available and the accuracy of the thermistor may be 0.2C, 0.5C, and 1.0C. The Curve Tracking temperature ranges and their code designators are shown in Figure 1 and Table 1. To specify, add the appropriate suffix from the following table to the part number. Example: 1M1002-B3 = Curve 1, 10 kilohms at + 25C, curve tracking to 0.5C from 0C to + 70C STANDARD ELECTRICAL SPECIFICATIONS FOR CURVE TRACKING THERMISTORS TEMP. RANGE 0C to + 70C TOLERANCE 1C 0.5C 0.2C 1C 0.5C 0.2C 1C 0.5C 0.2C 1C 0.5C 0.2C 1C 0.5C 0.2C PART NO. SUFFIX - 20C to + 50C 0C to + 100C 25C to + 90C 0C to + 50C - A3 - B3 - C3 - A2 - B2 - C2 - A4 - B4 - C4 - A5 - B5 - C5 - A8 - B8 - C8 C 1 X X X X X X X X N/A X X X X X X U 2 X X X X X X X X N/A X X X X X X R 4 X X X X X X X X N/A X X X X X X V 8 X X X X X X X X N/A X X X X X X E 9 X X X X X X X X N/A X X X X X X www.vishay.com 20 For technical questions, contact thermistor1@vishay.com Document Number: 33003 Revision 11-Feb-02 M, C, T NTC Thermistors, Coated Vishay Dale POINT MATCH TOLERANCE The standard leaded thermistors are calibrated and tested at 25C to a tolerance of 5% or 10%; however, tighter tolerance, point matched thermistors are readily available as are special point match temperatures to fit your application. Since these thermistors have only one controlled point of reference ( the point match temperature ), the resistance at other temperatures is given by the "Resistance VS Temperature Conversion Tables" for the appropriate material curve. The resistance value at any temperature is the ratio factor times the resistance at 25C. Example: 1M1002-5, +70C resistance = (Resistance factor for curve 1 at 70C is .1990) X (10000 ohm resistance at 25C) = 1990 ohms. The tolerance of the resistance at any temperature is described by Figure 2. FIGURE 2 POINT MATCH TOLERANCES VS. TEMPERATURE Point match resistance tolerances at temperatures other than 25C are not the same as the calibration temperature. This difference is presented in Figure 2. MAX. R VS. T RESISTANCE MIN. R VS. T NOMINAL R VS. T PIVOT POINT (CALIBRATION TEMPERATURE) The tolerance at any given temperature is the point match tolerance + the MT % (Manufacturing Tolerance). The MT % may be obtained from the R vs. T Conversion tables and is added to the point match temperature, i.e., 1% Tol. at 25C + 2.6% at -30C for Curve 1 equals a total tolerance of 3.6% at -30C. 25C TEMPERATURE COMPUTER AIDS FOR THERMISTOR SELECTION A spreadsheet is available for the Vishay Thermistor Materials that calculates Beta, Steinhart-Hart Equation Constants A, B, and C, the resistance at any temperature based upon the Steinhart constants or Beta, the temperature equivalent of the resistance reading, and resistance temperature coefficients. This spread sheet will also calculate the total resistance tolerance of any point matched thermistor for temperatures in 10C increments, and the resistance tolerance at any temperature within the calibrated range of curve tracking thermistors. Please contact factory if interested in this ExcelTM spreadsheet. Document Number: 33003 Revision 11-Feb-02 For technical questions, contact thermistor1@vishay.com www.vishay.com 21