Original title: negative temperature coefficient
Negative temperature coefficient is also called NTC thermistor and NTC temperature sensor resistor, which is called negative temperature coefficient in English; Abbreviation: NTC；; The resistance value of this kind of resistor is the sensor resistance that decreases with the increase of temperature. It is an overcurrent semiconductor ceramic made by fully mixing, molding and sintering metal oxides such as manganese, copper, silicon, cobalt, iron, nickel and zinc. Negative temperature coefficient is mainly to avoid the surge current generated in the electronic circuit at the instant of startup. A power type negative temperature coefficient is connected in series in the power supply circuit, which can effectively suppress the surge current at startup. After the suppression of surge current, the resistance value of the power type negative temperature coefficient will drop to a very small degree due to the continuous action of its current, and its power consumption can be ignored. It will not affect the normal working current, so the use of power negative temperature coefficient in the power circuit is the simplest and most effective measure to suppress the surge during startup and ensure the electronic equipment from being damaged. Widely used in switching power supplies, adapters, incandescent lamps, electronic motors, LED lighting lamps, electric vehicles and other products.
And our company Shunhai Technology Co., Ltd. is the first-class agent of "Shuokai" brand. Main products include negative temperature coefficient (NTC), ceramic gas discharge GDT, semiconductor discharge tube TSS, varistor MOV/MLV, transient suppression diode TVS, electrostatic protector ESD, self-recovery fuse PPTC and other over-current and over-voltage protection devices. If you need the above products, please leave a message or call: 0755-2810016; Lots of spot stock, please inquire or take samples for testing. Then the following small series introduces the selection of several specifications and parameters of negative temperature coefficient MF72 series as follows.
The parameter selection table of negative temperature coefficient -MF72 series -D-5 model is as follows
| Part number |
Resistance at 25℃ ±20% |
Max permissible
Working
Current |
Resistance
Under load
（mΩ） |
Dissipation
Factor |
thermal
Time
Constant |
| R25（Ω） |
lmax（A） |
（mΩ） |
δ(mW/℃) |
τ（Sec） |
| MF72-SCN5D-5 |
5 |
1 |
353 |
6 |
20 |
| MF72-SCN10D-5 |
10 |
0.7 |
771 |
6 |
20 |
| MF72-SCN16D-5 |
16 |
0.5 |
1093 |
6 |
18 |
| MF72-SCN20D-5 |
20 |
0.3 |
1878 |
6 |
18 |
| MF72-SCN60D-5 |
60 |
0.5 |
1878 |
6 |
18 |
| MF72-SCN200D-5 |
200 |
0.1 |
6259 |
6 |
18 |
The parameter selection table of negative temperature coefficient -MF72 series -D-7 model is as follows
| Part number |
Resistance at 25℃ ±20% |
Max permissible
Working
Current |
Resistance
Under load
（mΩ） |
Dissipation
Factor |
thermal
Time
Constant |
| R25（Ω） |
lmax（A） |
（mΩ） |
δ(mW/℃) |
τ（Sec） |
| MF72-SCN5D-7 |
5 |
2 |
283 |
10 |
30 |
| MF72-SCN8D-7 |
8 |
1 |
539 |
9 |
28 |
| MF72-SCN10D-7 |
10 |
1 |
616 |
9 |
27 |
| MF72-SCN16D-7 |
16 |
0.7 |
897 |
9 |
27 |
| MF72-SCN22D-7 |
22 |
0.6 |
1108 |
9 |
27 |
| MF72-SCN33D-7 |
33 |
0.5 |
1485 |
10 |
28 |
| MF72-SCN200D-7 |
200 |
0.2 |
6233 |
11 |
28 |
The parameter selection table of negative temperature coefficient -MF72 series -D-9 model is as follows
| Part number |
Resistance at 25℃ ±20% |
Max permissible
Working
Current |
Resistance
Under load
（mΩ） |
Dissipation
Factor |
thermal
Time
Constant |
| R25（Ω） |
lmax（A） |
（mΩ） |
δ(mW/℃) |
τ（Sec） |
| MF-72SCN2.5D-9 |
2.5 |
4 |
128 |
11 |
35 |
| MF-72SCN3D-9 |
3 |
4 |
120 |
11 |
35 |
| MF-72SCN5D-9 |
5 |
3 |
210 |
11 |
34 |
| MF-72SCN8D-9 |
8 |
2 |
400 |
11 |
32 |
| MF-72SCN10D-9 |
10 |
2 |
458 |
11 |
32 |
| MF-72SCN16D-9 |
16 |
1 |
802 |
11 |
31 |
| MF-72SCN20D-9 |
20 |
1 |
864 |
11 |
30 |
| MF-72SCN22D-9 |
22 |
1 |
950 |
11 |
30 |
| MF-72SCN25D-9 |
25 |
1 |
914 |
12 |
30 |
| MF-72SCN33D-9 |
33 |
1 |
1124 |
11 |
30 |
| MF-72SCN35D-9 |
33 |
1 |
1103 |
12 |
30 |
| MF-72SCN50D-9 |
50 |
1 |
1265 |
11 |
30 |
| MF-72SCN60D-9 |
60 |
0.8 |
1502 |
11 |
30 |
| MF-72SCN80D-9 |
80 |
0.8 |
2108 |
11 |
30 |
| MF-72SCN100D-9 |
100 |
0.8 |
2576 |
11 |
30 |
| MF-72SCN120D-9 |
120 |
0.8 |
3115 |
11 |
30 |
| MF-72SCN200D-9 |
200 |
0.5 |
5007 |
11 |
32 |
| MF-72SCN300D-9 |
300 |
0.5 |
9150 |
10 |
32 |
Main parameters of negative temperature coefficient are as follows
(1) zero power resistance @ 25℃; Resistance at 25℃；
(2) Maximum steady-state current; Maximum Permissible Working Current；
(3) Resistance under the maximum steady-state current; Resistance under Load；
(4) dissipation factor; Dissipation Factor；
(5) Thermal time constant; Thermal Time Constant；
The main functions of negative temperature coefficient are as follows
(1) current suppression;
(2) Temperature detection and temperature compensation;
(3) Temperature sensing;
Negative temperature coefficient principle is as follows
(1) at normal temperature, the resistance is large, which can limit the current;
(2) In normal operation, NTC has high temperature and low resistance, which does not affect the normal operation of the circuit;
Characteristics of negative temperature coefficient
(1) the sensitivity is high, and the temperature change of 10-6℃ can be detected;
(2) Wide working temperature range, normal temperature devices are suitable for-55℃ ~ 315℃, high temperature devices are suitable for higher than 315℃, and low temperature devices are suitable for-273℃ ~-55℃;
(3) It is small in size and can measure the temperature of voids, cavities and blood vessels in organisms;
(4) Easy to use, the resistance value can be arbitrarily elected between 0.1 ~ 100 kω; Easy to process into complex shapes;
Application of negative temperature coefficient
The applications of negative temperature coefficient are switching power supply, adapter, incandescent lamp, electronic motor, LED lighting lamp, electric vehicle (level overcurrent protection), etc.
The above content mainly introduces the main information of negative temperature coefficient. If you need related products, please leave a message or call: 0755-28100016; Massive spot stock in negative temperature coefficient, please consult the price.
Shenzhen Shunhai Technology Co., Ltd. is a professional fuse, patch fuse, recoverable fuse, self-recovery fuse, ELLON resistor, patch resistor, integrated inductor, TVS, ESD, PPTC, GDT, TSS, MOS, LDO and other protective devices. The electrostatic tube agency brands are Huade, Saruiwei, Shuokai, Tianer, Guoju and Housheng EVER, OHMS, MURATA, TAIYO, SUNLROP, TDK, LRC, ITE, SAMSUNG, professional sales teams and massive spot stocks provide customers with better service, and welcome consultation and cooperation.
Tags: negative temperature coefficient, negative temperature coefficient selection, negative temperature coefficient parameters, negative temperature coefficient function, negative temperature coefficient characteristics, negative temperature coefficient application
