A PTC thermistor is a thermally sensitive semiconductor resistor. Its resistance value rises sharply with increasing temperature after a defined temperature (reference temperature) has been exceeded. The very high positive temperature coefficient (PTC) of the resistance above the reference tem-perature has given the PTC thermistor its name.
For Part No. of Teflon encased thermistors add 100 to part No. of ±0-2°C interchangeable thermistor. Example: 44005 is a standard thermistor. 44105 is a Teflon encased thermistor with the same resistance values.
The PTC’s resistance values for motor protection are specified in DIN 44081/44082. Resistance values below q NAT –20 are not specified, and resistance when cold is no indication of the PTC’s condition. It is ideally between 40 - 200 ohms but can be anywhere between 35 - 250 ohms. The greatest resistance change occurs between 65 °C either ...
PTC Thermistor | Resistor Types | Resistor Guide - EE Power
The transition temperature of most switched PTC thermistors is between 60 and 120 °C. However, there are special application devices manufactured that can switch as low as 0 °C or as high as 200 °C. The resistance-temperature (R-T) characteristics of …
By varying the composition and the size of the thermistors, a wide range of resistance values (0.1Ωto 1MΩ) and tem-perature coefficients (-2 to -6% per °C) can be achieved. 2 – MAIN CHARACTERISTICS 2.1 CHARACTERISTICS WITH NO DISSIPATION 2.1.1. Nominal Resistance (Rn) The nominal resistance of an NTC thermistor is generally given at 25°C.
Thermistor Resistance Table - Sterling Sensors
PTC thermistors. Positive temperature coefficient thermistors have a resistance which rises as the temperature increases (Fig 2.) and are not used for temperature measurement. They are ideal as current and temperature limiting devices for circuit protection, such as Lithium batteries.
All of the PTC thermistors are specified to have a resistance of 470 Ω at room temperature (25 oC). As stated earlier, this resistance jumps up dramatically after the Curie temperature.
A flow chart in the quality section of this book (see page) shows the individual processing steps in detail. The chart also illustrates the extensive quality assurance measures taken during manufac-ture to guarantee the constantly high quality level of our thermistors.
Most PTC thermistors are designed to operate with a transition temperature somewhere between 60°C and 120°C, however, devices can be manufactured that can switch as low as 0°C or as high as 200°C. The majority of switching PTC thermistors are …
Avoid contamination of thermistors surface during storage, handling and processing. Avoid storage of thermistor in harmful environment with effect on function on long-term opera-tion (examples given under operation precautions). Use thermistor within the following period after delivery: Through-hole devices (housed and leaded PTCs): 24 months
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