Temperature Coefficient of the abbreviation, meaning negative temperature coefficient, refers to the negative temperature coefficient of semiconductor materials or components, usually we mention the NTC refers to the negative temperature coefficient thermistor, referred to as NTC thermistor. Also known as negative temperature coefficient thermistor, is a class of resistance value with the temperature increases and decreases a sensor resistance.
NTC thermistor is a very simple temperature sensor, very common in consumer electronics.NTC thermistor is a typical temperature-sensitive semiconductor resistor, its resistance value with the increase in temperature is a step decrease.
NTC thermistors are made of metal oxides such as manganese, cobalt, nickel, and copper, and are manufactured using a ceramic process. These metal oxide materials are semiconducting in nature, as they are completely similar to semiconducting materials such as germanium and silicon in the way they conduct electricity. When the temperature is low, the number of carriers (electrons and holes) of these oxide materials is small, so their resistance value is high; as the temperature rises, the number of carriers increases, so the resistance value decreases.
NTC Thermistors Category
NTC thermistors are categorized according to their applications：
◎Power type NTC thermistor
◎Compensation type NTC thermistor
◎Temperature measurement NTC thermistors
NTC thermistors are divided into three generations of products based on their structure:
The first generation of products is called block ceramic NTC thermistor.
The second generation of products is called multilayer ceramic NTC thermistor, and the second generation of products is called multilayer ceramic NTC thermistor.
The third generation of ceramic thick film type NTC thermistor, its temperature measurement range is generally in -10 ~ +300 ℃, but there are also higher temperature measurement of the thermistor, one of the more important parameters is the rated zero-power resistance and accuracy, that is, 25 ℃ resistance, we often say that the resistance of the thermistor in fact, has been defaulted to the resistance at 25 ℃, the NTC thermistor by the NTC thermistors are made of mixed oxide polycrystalline ceramics. Different materials and different packages are used in different applications.
NTC Thermistors Parameter &Measurement
There are two more important parameters for NTC selection, one is the resistance value at 25°C and the other is the B constant (25/50°C). If these two parameters are the same for two NTCs, the curves of their NTC resistance values and temperatures are almost similar, and they can be substituted.
The NTC measurement should be done in two steps.
Step one:
Measure its nominal resistance value at 25°C. For example, 100K NTC. at 25 ℃ with a multimeter or resistance meter its resistance value, record the measured value and the nominal value for comparison;
Step two:
Measure the resistance value at a specific temperature. For example: the 100K NTC at a constant temperature of 60 ℃ (recommended to use the oil tank for measurement, because the temperature of the oil tank is more constant) to measure its resistance value, record the measured value and the nominal value for comparison, the test resistance value should be about 24.5K.
NTC thermistors generally serve five main purposes:
◎Inrush current suppression
◎Temperature measurement
◎Temperature compensation
◎Liquid level measurement
◎Overheating protection
The use of NTC thermistor NTC temperature sensor self-heating characteristics can be realized automatic gain control, constitute the RC oscillator amplitude stabilization circuit, delay circuit and protection circuit, can also be used as a temperature measurement element, such as induction cookers, electric heaters have applications.
NTC can be used to measure temperature in the demand for temperature measurement accuracy is not high, generally NTC resistance and a certain value of resistance in series, through the measurement of the voltage across the resistor can be calculated NTC resistance, and then you can know the approximate temperature value of the current environment.
In addition, NTC with its excellent cost-effective, packaged in a variety of forms of adaptability, as well as simple to use, in many cases in various fields will become the engineers temperature measurement circuit in the preferred method of temperature measurement, widely used in household appliances, electric power industry, communications, military science, aerospace and other fields, the development prospects are extremely broad.
Difference Between NTC and PTC
Of course, in addition to NTC, there are PTC thermistors, what is the difference between these two? What is the difference between these two?
The main function of a thermistor is to show a change in resistance with a change in temperature.
NTC (negative temperature coefficient) thermistors are characterized by:
No power consumption resistance
Its resistance decreases as the temperature rises
The response of NTC resistors to temperature changes is usually linear. When a continuous linear change in resistance versus temperature is required, such as for temperature compensation, temperature control systems, and inrush current limiting, the choice of an NTC thermistor is more appropriate.
PTC (Positive Temperature Coefficient) thermistors are characterized by:
No power consumption resistance
Their resistance increases with increasing temperature
PTC resistance changes slightly with increasing temperature until it reaches a "switching point", after which the resistance increases by several orders of magnitude.PTCs are typically used in self-resetting fuses and heater applications.PTCs are typically used in series in circuits to limit the current in the circuit, and are a type of overcurrent protection device.
UF Capacitors is established since 1995, as one of the professional China Capacitor manufacturer in China, we are strong in complete management, strict quality control system, and excellent sales service. UF Capacitors supply high quality Capacitors ,help customers cost down 20%-50%.UF Capacitors offers high quality MF72 Power NTC Thermistor
Features
Small size , Strong power and strong capability of surge current protection.
Fast response to surge current.
Big material constant(B value), Small remain resistance.
Longevity of service, High reliability.
Integral series , Extensive operating range
Silicon Epoxy Coating, Copper Leads
RoHS Compliant
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Power NTC Thermistor |
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MF72 Power NTC Thermistor |
B57 Series |
SCK*** Series |
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