NTC-10D-11

NTC NTC THERMISTOR OUTLINE 2 1200 This is a Negative Temperature Coefficient Resistor Whose resistance changes with ambient temperature changes. Thermistor comprises 2or 4 kinds of metal oxides of iron, nickel,cobalt, manganese and copper, being shaped and Sintered at high temperature(1200 to 1500 ) 4 1500 Critical Technical Parameters of NTC Thermistor NTC Rt---Resistance Value at Zero-power It's a resistance which is got at a fixed temperature on a basis of a testing power which causes resistance to Vary in a range which can be ignored in relation to the total testing eror. Rt R25---Resistance Value at Rated Zero-power The design resistance of the thermistor usually refers to the resistance value got at Zero-power at 25 , which is usually indicated on the thermistor. R25 25 B Value B value stands for the thermal exponent at a negative temperature coefficient. lt's defined as a ratio of the balance between the natural logarithms of resistance values at zeropower to the balance between the reciprocals of the two temperatures.The formula is as below: B B B=ln RT1 ( 1 / T1 RT2 1 ) T T R = 1 2 ln T1 T2 RT2 T2 T1 RT1 T1 RT2 T2 B=ln R T1 ( 1 / R T2 T 1 1 ) T1 T2 R = ln T1 T2 R T2 T2 T1 In this formula: RT1 is the resistance at Zero-power when the temperature is T1 15K ) RT2 is the resisrtance at Zero-power when the temperature is B 25 ( 298. ( 323.15K ) ,B 50 T2 Unless otherwise specified, B value is got by calculating the Zero-power resistances at 25 ( 298.15K ) and50 ( 323.15K ) . It's not a firm constant within the range of working temperature. Resistance-to-Temperature Coefficient at Zero-power It refers to the ratio of changes of a thermistor. Resistance value at Zero-powerwhen The temperature, to the resistance value at Zero-power The formula is as below: T = T 1 DRT = RT DT T T RTT B B T2 T ( B K ) T = 1 DR T = R T DT B T2 In this formula, " " stands for the resistance-temperature coefficient at Zero-power when the temperature is T: RT stands for the resistance value at Zero-power when the temperature is T T stands for thetemperature(in K) B stands for B value 138 NTC NTC THERMISTOR Max. steady state current. max max. . The maximum allowable continuous current passing through thermistor at 25 . Dissipation Coefficient It's the ratio of the changes with a thermistor dissipation power, in a , = P/ T pre-set ambient temperature, to the changes with the temperature. The formula is as below: = P/ T changes in response when the ambient temperature changes, within the ranges of the working temperature. Thermal Time Constant At Zero-power and when amutatio occurs with the temperature, the time "t", which is-spent for finishing 63.2% of the gap between 63.2% the beginning temperature and the ending temperature in the C thermistor. is directly proportional to"c",the heat capacity of the =C / thermistor, and is inversely proportional to constant. That is " =C/ , the dissip ation ". APPLICATIONS UPS Conversion power supply, switch power, UPS power, Kinds of electric heter, electronic energy-saving lamps, electronic ballast etc all kinds of power cicuit proterction of electronic equipments, filament proterction of CRT, bulb and other lighting lamps. 139 (NTC) Surge-Arrestor NTC Thermistor FEATURES Small in size,high-powered, and very capable of bringing down the surge current; Quick in reaction; High in B value and low in residual current; Long service life and high reliability; High coefficient of safety and wide range of application. B HOW TO ORDER 10 NTC D-13 13 10 Negative Temperature Cofficient Resistor Diameter of Chip: Resistance Value:10 DIMENSIONS (mm) D A F C E (mm) Type C A 1 D MAX E 0.05 MAX F MAX D-20 22 7.5/10 7 1.0 3 D-15 16.5 7.5 6 0.8 3 D-13 14.5 7.5 6 0.8 3 D-11 12.5 7.5 5 0.8 3 D-9 10.5 7.5 5 0.8 3 D-7 8.5 5.0 5 0.5 3 D-5 6.5 5.0 5 0.5 3 13 2A E 0.6 Remarks: " E"value may be 0.6 for resistors for which the chip's diameter is 13 and the working current is 2A. 140 13 NTC NTC THERMISTOR SPECIFICATIONS & PROPERTIES R25 Model NTC 5D-5 NTC 10D-5 (A) Max. Steadycurrent(A) ( ) Approx R of Max.Cur.( ) Power Dissipation coefficient(mW/ ) Time Constant (s) 5 1 0.353 6 20 10 0.7 0.771 6 20 20%( ) NTC 16D-5 16 0.5 1.093 6 18 NTC 20 0.3 1.878 6 18 NTC 5D-7 5 2 0.241 10 30 NTC 8D-7 8 1.5 0.436 9 28 20D-5 NTC 10D-7 10 1 0.572 9 27 NTC 16D-7 16 0.7 0.897 9 27 NTC 22D-7 22 0.6 1.083 8 27 NTC 2.5D-9 2.5 4 0.128 11 35 3 4 0.133 11 35 NTC 5D-9 5 3 0.236 11 35 NTC 8D-9 8 2 0.382 11 34 NTC 10D-9 10 2 0.467 11 34 NTC 16D-9 16 1 0.688 11 32 NTC 22D-9 22 1 0.899 11 30 NTC 25D-9 25 1 0.914 12 30 NTC 35D-9 35 1 1.103 12 30 NTC 50D-9 50 1 1.265 11 30 NTC 60D-9 60 1 1.521 11 30 NTC 3D-9 80 0.8 2.108 11 30 NTC 100D-9 100 0.8 2.576 11 30 NTC 120D-9 120 0.8 3.115 11 30 NTC 200D-9 200 0.5 5.900 10 32 NTC 300D-9 300 0.5 9.150 10 32 NTC 2.5D-11 2.5 5 0.120 13 46 NTC 80D-9 NTC 3D-11 3 5 0.126 13 45 NTC 5D-11 5 4 0.228 13 45 NTC 8D-11 8 3 0.301 13 45 NTC 10D-11 10 3 0.395 14 47 NTC 16D-11 16 2 0.488 14 50 NTC 20D-11 20 2 0.613 14 52 NTC 22D-11 22 2 0.739 14 52 NTC 25D-11 25 2 0.838 14 52 NTC 50D-11 50 1.5 1.204 14 52 NTC 2.5D-13 2.5 6 0.099 13 60 3D-13 3 6 0.112 14 60 NTC 5D-13 5 5 0.136 15 68 NTC 8 4 0.256 15 65 NTC 10D-13 10 4 0.271 15 65 NTC 16D-13 16 3 0.368 16 60 NTC 8D-13 141 SPECIFICATIONS & PROPERTIES R25 (A) Max. Steadycurrent(A) ( ) Approx R of Max.Cur.( ) Power Dissipation coefficient(mW/ ) Time Constant (s) 3 7 0.094 18 76 NTC 4D-15 4 6 0.128 20 76 NTC 5D-15 5 6 0.132 20 76 Model 20%( NTC 3D-15 ) 8 5 0.196 20 80 NTC 10D-15 10 5 0.255 20 85 NTC 16D-15 16 4 0.307 19 77 NTC 8D-15 NTC 30D-15 30 3.5 0.519 19 80 NTC 33D-15 33 3.5 0.610 19 80 NTC 47D-15 47 3 0.771 20 86 NTC 3D-20 3 8 0.079 24 100 NTC 5D-20 5 7 0.106 23 87 NTC 8D-20 8 6 0.157 23 105 NTC 10D-20 10 6 0.194 23 118 NTC 16D-20 16 5 0.236 25 113 142