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Negative temperature coefficient
Publish:Shenzhen Tergy Technology Co., Ltd.  Time:2016-10-26
NTC thermistor, surge suppression, is a wafer type thermistor of a high power, commonly used in electronic circuit, motor starting capacitor and the heater.
In the circuit power supply connected to the instant, the circuit can generate higher than normal surge current many times, while the NTC thermistor initial resistance is large, can be too large a current suppression circuit, thereby protecting the power supply circuit and the load.
When the circuit is in the normal working state, the heat sensitive resistance is caused by the current and the resistance value is increased, and the resistance value drops to a very small, which can not affect the normal operation of the circuit.
The product has high bearing power and thermal response characteristics of high speed, high current suppression ability, can guarantee the power supply equipment such as computer and electronic circuit from the large current impact and damage, improve the reliability of the circuit element is ideal.
 
  Main technology - thermal resistance parameters:
Model R25+-20%
(Ω)
Steady state current
(A)
Residual resistance
(Ω)
Dissipated power
(mW/℃)
time constant
(S)
working temperature
(℃)
3D-9 3 4 0.120 11 35 -55/+200
4D-9 4 3 0.190 11 35 -55/+200
5D-9 5 3 0.210 11 34 -55/+200
6D-9 6 2 0.315 11 34 -55/+200
8D-9 8 2 0.400 11 32 -55/+200
10D-9 10 2 0.458 11 32 -55/+200
12D-9 12 1 0.652 11 32 -55/+200
16D-9 16 1 0.802 11 31 -55/+200
20D-9  20 1 0.864 11 30 -55/+200
30D-9 30 1 1.022 11 30 -55/+200
50D-9 50 1 1.252 11 30 -55/+200
80D-9 80 0.8 2.010 11 30 -55/+200
2.5D-11 2.5 5 0.095 13 43 -55/+200
3D-11 3 5 0.100 13 43 -55/+200
4D-11 4 4 0.150 13 44 -55/+200
5D-11 5 4 0.156 13 45 -55/+200
6D-11 6 3 0.240 13 45 -55/+200
8D-11 8 3 0.255 13.5 47 -55/+200
10D-11 10 3 0.275 14 47 -55/+200
12D-11 12 2 0.426 14 48 -55/+200
16D-11 16 2 0.470 14 50 -55/+200
20D-11 20 2 0.512 15 52 -55/+200
30D-11 30 1.5 0.667 15 52 -55/+200
50D-11 50 1.5 1.201 15 51 -55/+200
80D-11 80 1.2 1.656 15 51 -55/+200
1.3D-13 1.3 7 0.062 13 60 -55/+200
1.5D-13 1.5 7 0.073 13 60 -55/+200
2.5D-13 2.5 6 0.088 13 60 -55/+200
3D-13 3 6 0.092 14 60 -55/+200
4D-13 4 5 0.120 15 67 -55/+200
5D-13 5 5 0.125 15 68 -55/+200
6D-13 6 4 0.170 15 65 -55/+200
7D-13 7 4 0.188 15 65 -55/+200
8D-13 8 4 0.194 15 60 -55/+200
10D-13 10 4 0.206 15 65 -55/+200
12D-13 12 3 0.316 16 65 -55/+200
15D-13 15 3 0.335 16 60 -55/+200
16D-13 16 3 0.338 16 60 -55/+200
20D-13 20 3 0.372 16 65 -55/+200
30D-13 30 2.5 0.517 16 65 -55/+200
1.3D-15 1.3 8 0.048 18 68 -55/+200
1.5D-15 1.5 8 0.052 19 69 -55/+200
2.5D-15 2.5 7 0.070 19 79 -55/+200
3D-15 3 7 0.075 18 76 -55/+200
4D-15 4 6 0.097 20 76 -55/+200
5D-15 5 6 0.112 20 76 -55/+200
6D-15 6 5 0.155 20 80 -55/+200
7D-15 7 5 0.173 20 80 -55/+200
8D-15 8 5 0.178 20 80 -55/+200
10D-15 10 5 0.180 20 75 -55/+200
12D-15 12 4 0.250 20 75 -55/+200
15D-15 15 4 0.268 21 85 -55/+200
16D-15 16 4 0.276 21 70 -55/+200
20D-15 20 4 0.288 17 86 -55/+200
30D-15 30 3.5 0.438 18 75 -55/+200
0.7D-20 0.7 12 0.018 25 89 -55/+200
1.3D-20 1.3 9 0.037 24 88 -55/+200
3D-20 3 8 0.055 24 88 -55/+200
5D-20 5 7 0.087 23 87 -55/+200
6D-20 6 6 0.113 25 103 -55/+200
8D-20 8 6 0.142 25 105 -55/+200
10D-20 10 6 0.162 24 102 -55/+200
12D-20 12 5 0.195 24 100 -55/+200
16D-20 16 5 0.212 25 100 -55/+200

NTC thermistor selection should consider the following points:
Maximum rated voltage and filter capacitance
The size of the filter capacitor determines the size of the NTC should be chosen. For a size of NTC thermistor, allowing access to the size of the filter capacitor is strictly required, this value is also related to the maximum rated voltage. In power applications, the power surge is due to capacitor charging, so it is usually used to assess the capacity of the NTC thermistor to withstand the surge current with the capacitance of the given voltage value. For a specific NTC thermistor, the maximum energy can bear has been identified, according to the resistance in first order circuit energy consumption formula of E=1/2 * CV2 can be seen, which allows access to the value of capacitance and rated voltage is proportional to the square of the. In simple terms, the greater the input voltage, the smaller the maximum capacitance value is allowed, and vice versa.
Negative temperature coefficient
The specification of the NTC thermistor product generally defines the maximum capacitance that allows access to the 220Vac. Assuming a certain application conditions the maximum rated voltage is 420Vac, the filter capacitor value is 200 F, according to the above formula can be converted into energy equivalent capacitance under the 220Vac value should be 200 * 4202/2202=729 ~ F, so we must choose the 220Vac to allow access to the capacitance value larger than 729 F in model selection.
The maximum starting current maximum allowed value of starting current products and long-term load in the NTC thermistor on the current electronic products allows the value of NTC is determined by the resistance of the thermistor. Assuming the rated power input is 220Vac, the resistance is 1 ohms, the maximum starting current allowed is 60A, then select the minimum NTC value in the initial state of the Rmin= (220 x 1.414/60) -1=4.2 (omega). At this point, to meet the conditions of the NTC thermistor will generally have one or more, at this time and then according to the following method to choose.
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