Mar. 12, 2025
A thermistor is a temperature-sensitive electronic component made of semiconductor materials. Its resistance changes with temperature, playing a crucial role in temperature monitoring, control, and protection.
In electronic products, thermistors can measure temperature changes by detecting variations in resistance. They are also used in overheat protection devices, where a thermistor's resistance change triggers a protection mechanism when the temperature exceeds a set threshold.
How much do you know about thermistors? Try the following questions and see how many you can answer correctly!
Q1: As the temperature increases, the resistance of a thermistor always increases.
A1: False. Thermistors are classified into Positive Temperature Coefficient (PTC) and Negative Temperature Coefficient (NTC) types based on their temperature coefficient.
PTC thermistors: Their resistance increases as temperature rises.
NTC thermistors: Their resistance decreases as temperature rises.
Q2: A thermistor labeled "NTC 5D-9" means it is an NTC thermistor with a diameter of 5mm and a resistance of 9Ω.
A2: False. The label "NTC 5D-9" indicates:
It is a Negative Temperature Coefficient (NTC) thermistor.
It has a resistance of 5Ω at 25°C.
It has a diameter of 9mm.
Q3: If the temperature is too high, a thermistor might explode.
A3: True. Although rare, thermistors can explode under extreme conditions. This usually happens due to:
Prolonged overload operation.
Excessively high supply voltage.
Use of low-quality thermistors.
Q4: If a thermistor is damaged, replacing it with another thermistor of the same physical size will work fine.
A4: False. Simply matching the size is not enough. The replacement thermistor must have the same model and specifications to function correctly.
This article is provided by JYH HSU (JEC) Electronics. JEC is a research, development, production, and sales-oriented company specializing in manufacturing and selling various electronic components such as capacitors and resistors.
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