Your shopping cart is empty! Please select the type which you want.
Home > Mall Dynamic > What Is A Thermistor, How It Works And Where It Is Used
NTC Thermistor (Negative Temperature Coefficient Thermistor) is a sintered oxide composed of manganese (Mn), nickel (Ni), copper (Cu) and other components. NTC thermistor is a kind of semiconductor resistor whose resistance value changes in the opposite trend with the change of temperature, and the change rate is very large. Usually thermistors can be used in temperature detection, temperature compensation, surge prevention and other occasions.
In contrast to RTDS, where the resistance changes almost linearly, NTC thermistors exhibit a significant nonlinear change in resistance and actually decrease with increasing temperature. Thermistors have always been a common temperature measurement tool for the following reasons:
Resistance varies significantly with each degree of temperature change, providing higher resolution
High repeatability and stability
Excellent interchangeability
Small size, can quickly respond to temperature changes
Epoxy coating for lower temperature applications [typically -50 to 150°C (-58 to 316°F)]
Glass coatings for higher temperature applications [typically -50 to 300°C (-58 to 572°F)]
These coatings provide mechanical protection for thermistor beads and wire connections while providing some moisture and/or corrosion protection. Epoxy bead thermistor is a thermistor temperature sensor commonly used by omega
Thermistors usually come with a solid copper wire or copper alloy wire with a very small diameter (# 32AW or 0.008" diameter). These lines are often tinned for easy soldering.
The resistance value of NTC thermistor decreases with the increase of temperature. The same is true for each degree of change in thermistor resistance. For applications with lower temperatures (-55 to about 70°C), thermistors with lower resistance (2252 to 10,000Ω) are usually used. For applications with higher temperatures, thermistors with higher resistance (above 10,000Ω) are usually used to optimize the resistance change per degree at the desired temperature. Thermistors have a variety of "resistance and temperature relationship curves" to choose from. Resistance values are usually measured at temperatures of 25°C (77°F).
In general, the resistance value of a metal increases with the increase of temperature. This is due to the fact that the heat intensifies the lattice vibration, and the average movement speed of the free electrons decreases.
In contrast, free electrons and holes in the semiconductor increase due to heat conduction, and the proportion of this part is greater than the proportion of the speed decreasing part, so the resistance value decreases.
In addition, due to the presence of band gaps within the semiconductor, when externally heated, electrons in the valence band move to the conduction band and conduct electricity. In other words, the resistance value will decrease with the increase of temperature.
Negative temperature coefficient (NTC) Thermistor with temperature changes, the resistance value will produce 3 ~ 5%/°C change. It is often used as a general temperature sensor in electronic devices.
Have you ever had the experience of "How did your phone get hot" while using your smartphone?
You can say that a thin, high-powered smartphone is a small computer. However, because the mobile phone has not installed the cooling fan of the computer, so the body will become hot. As a result, precise components that are sensitive to heat may be at risk of damage.
Here comes the negative temperature coefficient (NTC) thermistor!
A negative temperature coefficient (NTC) thermistor is used to measure the temperature inside the smartphone, and this temperature information is used for various temperature controls.
Mall Dynamic
