This increase in resistance limits the current flow, protecting the circuit from damage due to excessive current. Temperature sensing and control: PTC thermistors are used as temperature sensors in applications such as thermostats, HVAC systems, and temperature monitoring devices....
ThePTC typeis used when a sudden change in resistance at a certain temperature is required. They exhibit a sudden increase in resistance above a defined temperature, called the switch, transition, or Curie temperature. The most common switching temperatures are in the range of 60 °C to 120 ...
(Electronics) a semiconductor device having a resistance that decreases rapidly with an increase in temperature. It is used for temperature measurement, to compensate for temperature variations in a circuit, etc [C20: from thermo- + (res)istor] ...
The resistance change with temperature is high compared with the metallic resistances, and is usually negative: the resistance decreases with temperature increase. The temperature characteristics are highly nonlinear. Such thermistors, having a negative temperature coefficient, are called NTC thermistors. ...
temperature sensing accuracy Let's look at the "Z" curve for Quality Thermistors, in a voltage divider: You'll typically find NTC thermistors in a 10K nominal resistance at 25 C. This nominal resistance at 25 C is an important parameter of the thermistor, which we'll abbreviate as R25. ...
Negative Temperature Coefficient Thermistors or NTC Thermistors With NTC thermistors, resistance decreases as temperature rises, due to an increase in the number of conduction electrons energized by the thermal agitation from the valance band. NTC are commonly used as temperature sensors or in series wi...
PTC thermistors specifically increase resistance with a rise in temperature. There are two kinds of PTC thermistors: silistors and switching-type. Silistors, which use silicon as their conductive material, are known for their linear characteristics and are typically used as temperature sensors. ...
power is turned on, the NTC has a higher resistance, so it will suppress the surge current for about 1 to 2 seconds. During this period of time, the internal resistance of the NTC will decrease due to the increase in temperature. Until the voltage drop across the NTC thermistor is ...
above which a dramatic increase in resistance of several orders of magnitude occurs within a span of a few degrees Celsius. So, during an overcurrent condition, the PTC thermistor will have a high amount of self-heating beyond the switching temperature and its resistance will increase dramatically...
the figure that upto a certain temperature, lets call it a threshold temperature, the resistance decreases with increase in temperature much like a NTC Thermistor. As the temperature increases beyond the threshold temperature, the resistance starts to increase dramatically with increase in temperature. ...