SCN3D-9

Surge-Arrestor Negative Temperature Coefficient Thermistor SCNxxD-9 Series Outline This is a Negative Temperature Coefficient Resistor Whose resistance changes with ambient temperature changes.Thermistor comprises 2 or 4 kinds of metal oxides of iron,nickel,cobalt, manganese and copper, being shaped and sintered at high temperature(1200 ℃ to 1500 ℃ ). Applications Features  Small in size,high-powered, and very capable of Conversion power supply, switch power, UPS power, bringing down the surge current; Kinds of electric heater, electronic energy-saving lamps,  Quick in reaction; electronic ballast etc all kinds of power circuit protection of  High in B value and low in residual current;Long service electronic equipments, filament protection of CRT, bulb and life and high reliability;High coefficient of safety and wide other lighting lamps. range of application. Part Number Code SCN (1) 10 D-9 (2) (3) (1) SCN: Socay Negative Temperature Cofficient Resistor. (2) 10: Resistance Value:10Ω. (3) D-9: Diameter of Chip: Φ9. SOCAY Electronics Corp., Ltd. Revision October 31, 2016 www.socay.com 1/3 @ SOCAY Electronics Corp., Ltd. 2016 Specifications are subject to change without notice. Please refer to www.socay.com for current information. Surge-Arrestor Negative Temperature Coefficient Thermistor SCNxxD-9 Series Electrical Characteristics R25℃ ±20% Max Steady Current Approx R Of Max Current Power Dissipation Coefficient Time Constant (Ω) (A) (Ω) (mW/℃) (s) SCN2.5D-9 2.5 4 0.128 11 35 SCN3D-9 3 4 0.133 11 35 SCN5D-9 5 3 0.236 11 35 SCN8D-9 8 2 0.382 11 34 SCN10D-9 10 2 0.476 11 34 SCN16D-9 16 1 0.688 11 32 SCN22D-9 22 1 0.899 11 30 SCN25D-9 25 1 0.914 12 30 SCN35D-9 35 1 1.103 12 30 SCN50D-9 50 1 1.265 11 30 SCN60D-9 60 1 1.521 11 30 SCN80D-9 80 0.8 2.108 11 30 SCN100D-9 100 0.8 2.576 11 30 SCN120D-9 120 0.8 3.115 11 30 SCN200D-9 200 0.5 5.900 10 32 SCN300D-9 300 0.5 9.150 10 32 Part Number Dimensions (Unit: mm) Type D-9 AMAX 10.5 C±1 7.5 DMAX 5 E ± 0.05 0.8 FMAX 3 Note: “E”value may be 0.6 for resistors for which the chip's diameter is ≤ 13 and the working current is ≤ 2A. SOCAY Electronics Corp., Ltd. Revision October 31, 2016 www.socay.com 2/3 @ SOCAY Electronics Corp., Ltd. 2016 Specifications are subject to change without notice. Please refer to www.socay.com for current information. Surge-Arrestor Negative Temperature Coefficient Thermistor SCNxxD-9 Series Critical Technical Parameters of NTC Thermistor  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.  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.  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 zero-power to the balance between the reciprocals of the two temperatures.The formula is as below: In this formula: RT1 is the resistance at Zero-power when the temperature is T1,RT2 is the resistance at Zero-power when the temperature is T2 Unless otherwise specified,B value is got by calculating the Zero-power resistances at 25℃ (298.15K) and 50 ℃ (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: In this formula, "α " 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 the temperature(in K). B stands for B value.  Max steady state current. The maximum allowable continuous current passing through thermistor at 25℃.  Dissipation Coefficient δ It's the ratio of the changes with a thermistor dissipation power, in a pre-set ambient temperature, to the changes with the temperature. The formula is as below: δ= △P/△Tδ 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 the beginning temperature and the ending temperature in the thermistor. is directly proportional to"C",the heat capacity of the thermistor, and is inversely proportional to δ, the dissip ation constant. That is " τ=C/δ" . SOCAY Electronics Corp., Ltd. Revision October 31, 2016 www.socay.com 3/3 @ SOCAY Electronics Corp., Ltd. 2016 Specifications are subject to change without notice. Please refer to www.socay.com for current information.