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NCP03WB47305RL Datasheet(PDF) 6 Page - Murata Manufacturing Co., Ltd. |
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NCP03WB47305RL Datasheet(HTML) 6 Page - Murata Manufacturing Co., Ltd. |
6 / 40 page 5 1. Zero-power Resistance of Thermistor : R 2. B-Constant R=R0 expB (1/T-1/T0) ..............(1) R : Resistance in ambient temperature T (K) (K : absolute temperature) R0 : Resistance in ambient temperature T0 (K) B : B-constant of Thermistor as (1) formula B= Rn (R/R0) / (1/T-1/T0) ............(2) 3. Thermal Dissipation Constant When electric power P (mW) is spent in ambient temperature T1 and thermistor temperature rises T2, there is a formula as follows P=C (T2-T1) ..................(3) C : Thermal dissipation constant (mW/ °C) Thermal dissipation constant is varied with dimensions, measurement conditions, etc. 4. Thermal Time Constant Period in which Termistor's temperature will change 63.2% of its temperature difference from ambient temperature T0 ( °C) to T1 (°C). [Resistance vs. Temperature] !Basic Characteristics !Performance [Thermal Time Constant] Item Resistance Condition Measured by zero-power in specified ambient temperature. Rated Electric Power Shows necessary electric power that Thermistor's temperature rises 100˚C by self heating in ambient temperature 25˚C. Permissive Operating Current It is possible to keep Thermistor's temperature rising max. 1˚C Thermal Dissipation Constant Shows necessary electric power that Thermistor's temperature rises 1˚C by self heating. It is calculated by next formula. (mW/˚C) B-Constant Calculated between two specified ambient temperatures by next formula. T and T0 is absolute temperature (K). Rn (R/R0) B = 1/T Y1/T0 P C = T YT0 102 101 −20 Temperature (˚C) 0 20 40 60 80 120 100 10−2 10−1 1 B=3450 B=3900 B=4100 Basic Characteristics T1 T0 Time 63.2% X !Note • Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Please inquire about test conditions and ratings. Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this PDF catalog to prevent smoking and/or burning, etc. This catalog has only typical specifications. Therefore, you are requested to approve our product specifications or to transact the approval sheet for product specifications before ordering. !Note R44E9.pdf 05.4.13 |
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