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01C2001SFC3 Datasheet(PDF) 4 Page - Vishay Siliconix |
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01C2001SFC3 Datasheet(HTML) 4 Page - Vishay Siliconix |
4 / 5 page Document Number: 33003 For technical questions, contact: thermistor1@vishay.com www.vishay.com Revision: 12-Nov-09 107 M, C, T NTC Thermistors, Radial Leaded and Coated Vishay Dale POINT MATCH TOLERANCE The standard leaded thermistors are calibrated and tested at 25 °C 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 25 °C. The resistance vs. temperature conversion tables can be found at: www.vishay.com/doc?33004 and www.vishay.com/doc?33011. Example: 09M1002JF, + 70 °C resistance = (Resistance factor for curve 9 at 70 °C is 0.1990) x (10 000 Ω resistance at 25 °C) = 1990 Ω. 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 25 ºC are not the same as the calibration temperature. This difference is presented in figure 2. 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 (see www.vishay.com/doc?33004) and is added to the point match temperature, i.e., ± 1 % Tol. at 25 ºC + ± 2.6 % at - 30 ºC for Curve 1 equals a total tolerance of ± 3.6 % at - 30 ºC. 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 10 ºC increments, and the resistance tolerance at any temperature within the calibrated range of curve tracking thermistors. Please contact factory if interested in this Excel™ spreadsheet at thermistor1@vishay.com. 25 °C NOMINAL R vs. T MAX. R vs. T MIN. R vs. T PIVOT POINT (CALIBRATION TEMPERATURE) TEMPERATURE |
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