Global Positive Temperature
Coefficient (PTC) Thermistors Market is segmented on the basis of type,
applications, and region. Thermistors are thermally sensitive resistors whose
key function is to show a large, predictable and precise change in electrical resistance
when subjected to a corresponding change in body temperature.Its resistance
varies more significantly with temperature than in standard resistors.
Generally, the resistance increases with the temperature for most of the metals
but the thermistors respond negatively i.e. the resistance of the thermistors
decrease with the increase in temperature.
PTC stands for Positive
Temperature Coefficient. PTC thermistors are resistors with a positive
temperature coefficient, which means that the resistance increases with
increasing temperature. PTC thermistors are usually made of poly-crystalline
ceramic materials that are highly resistive in their original state and are
made semi-conductive by the addition of dopants.
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They are mostly used as PTC
self-regulating heaters.The transition temperature of most switched PTC
thermistors is between 60°C and 120°C. However, there are special application
devices manufactured that can switch as low as 0ᵒC or as high as 200ᵒC.PTC
thermistor is used as a sensor when the effect of environmental conditions on
the electrical characteristics is supervised. PTC thermistors can be used in
place of fuses for circuit protection. As the circuit heats up, resistance
increases to prevent overload.
Also, they are used as timing
devices in televisions. When the unit is switched on, the degaussing coil is
activated to eliminate the magnetic field; the thermistor automatically
switches it off when the temperature reaches a certain point.On the basis of
type, the global market is classified into Silistor, Switching PTC Thermistor.
Silistor uses a semiconductor as
its base material and it is characterized by a linear characteristic.
Accordingly, this type of device is used in temperature sensors. The silistor
PTC thermistor is mostly manufactured from incapacitated silicon. It exhibits a
resistance/temperature characteristic that is virtually linear, the exact
characteristic depending upon the semiconductor used and the level of doping.
Switching PTC Thermistor: is used
in heaters, sensors and specialized versions are also used as resettable fuses.
Switching type NTC thermistors have a highly non-linear curve. The resistance
at first falls with increasing temperature, and then at a critical temperature
the resistance increases intensely, thereby acting virtually as a switch.
Based on production technology,
the Positive Temperature Coefficient(PTC) Thermistors Marketis classified into
Ceramic PTC (Barium Titanate), Polymer PTC (Carbon Doped Polymer).On the basis
of modes, the Positive Temperature Coefficient(PTC) Thermistors Market is
classified into Self Heating Mode, and Sensor Mode.
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In the self-heating mode current
is passed through the thermistor, often in series with the item being
controlled. As it heats up as a result of the current, it reaches a point where
the critical temperature is reached and the resistance increases significantly.
It can be used as a safety cut-out or regulator.In the sensor mode, virtually
no current is passed through the device and PTC thermistor senses the
surrounding temperature. The self-heating effect is negligible and it is only
the surrounding temperature at which point the resistance will significantly
increase.
On the basis of application, the
Positive Temperature Coefficient(PTC) Thermistors Marketis classified into
Audio-visual Equipment, Information Equipment, Communication Equipment,
Automobile Electronics, Home Electronics, Power Supply, Other.
Geographically, the Positive
Temperature Coefficient(PTC) Thermistors Market is segmented into North America
(U.S., Canada and Mexico), Europe (Germany, France, England, Russia and Italy),
Asia Pacific (China, Japan, Korea, India, and Southeast Asia), South America,
Middle East and Africa.
The global key players in the
Positive Temperature Coefficient(PTC) Thermistors Market are TE, Polytronics,
CYG Wayon, Littelfuse, Bourns, Fuzetec, Sea & Land, Keter, Hollyland, TDK
(EPCOS), VISHAY, Amphenol (GE SENSING), Jinke, MURATA, Thinking, Uppermost,
HIEL, HGTECH, and Hansor.
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