Negative Temperature Coefficient Thermistors (NTC Thermistors) 
 
Product Model: D-5, D-7, D-11, D-15, D-20, D-25 Series    

NTC thermistors are thermistors with negative temperature coefficient. It is a high-performance ceramic with a structure close to the theoretical density using a single high-purity material. Therefore, in the realization of miniaturization at the same time, also has a resistance value, temperature characteristics of small fluctuations, fast response to various temperature changes can be high sensitivity, high precision detection: measurement. NTC thermistor semi-conducting ceramics are mostly spinel structure or other structure of the oxide ceramics, with negative temperature coefficients, the resistance value can be approximated as follows: where RT, RTO are the resistance value at temperature T, TO, BN For the material constant. Ceramic grain itself due to temperature changes in the resistivity changes, which is determined by the semiconductor properties. 

In order to avoid the inrush current generated in the electronic circuit at the moment of power-on, a power type NTC thermistor is connected in series in the power supply circuit, which can effectively inhibit the inrush current at the time of power-on, and after the completion of the role of inhibiting the inrush current, due to the continuous action of the current through the power type NTC thermistor, the resistance of the power type NTC thermistor will drop to a very small degree, the power consumed by the power of the negligible, and does not have an impact on the normal operating current. Therefore, the use of power type NTC thermistors in the power supply circuit is a simple and effective measure to inhibit the inrush at power-on to ensure that electronic equipment is not damaged.

The NTC thermistor for surge suppression is a high power round chip thermistor commonly used in electronic circuits with capacitors, heaters, and motor starts. In the circuit power on moment, the circuit will produce many times higher than the normal operation of the inrush current, and the NTC thermistor initial resistance value is large, can inhibit the circuit of excessive current, so as to protect its power supply circuit and load. When the circuit enters into normal operation, the thermistor causes the temperature of the resistor body to rise due to the passage of current, and the resistance value drops to a very small value, which will not affect the normal operation of the circuit. 

Applications: air conditioning equipment, heating equipment, electronic thermometer, liquid level sensing, automotive electronics, electronic calendars, cell phone batteries. 

When the circuit enters into normal operation, the thermistor causes the temperature of the resistor body to rise due to the passage of current, and the resistance value drops to a very small value, which will not affect the normal operation of the circuit.   

This is a negative temperature coefficient resistor whose resistance changes with the ambient temperature.
Thermistors are made of 2 or 4 metal oxides of iron, nickel, cobalt, manganese and copper, molded and sintered at high temperatures (1200C to 1500C).

Applications: 
1, conversion power supply, switching power supply, UPS power supply
2, electronic energy-saving lamps, electronic ballasts and various types of heaters 
3, electronic circuits, power lines
4, various types of tubes, monitors, 5, incandescent lamps, other lighting fixtures, etc.

Remarks:Comply with ROHS Directive REACH Directive Bromine and Halogen Free   

NTC thermistor key technical parameters:
*RT-zero power resistance value
*It is based on testing the resistance obtained at a fixed temperature.
*The power that causes the resistance to change within a negligible range versus the total test error.
*R25 - Rated Zero Power Resistance Value
*The design resistance value of a thermistor is usually the resistance value obtained at zero power at 25°C, usually as indicated on the thermistor.