Діапазон опорів і застосування термісторів

Діапазон опорів термісторів широкий, а опір термісторів NTC може коливатися від десятків Ом до десяти тисяч Ом, і навіть спеціальні пристрої можна налаштувати відповідно до потреб. Зазвичай використовуються значення опору 2,5 Ом, 5ох, 10ох, 100ох, тощо, і загальні помилки опору ±15%, ±20%, ±30%, тощо. Діапазон опору термісторів PTC зазвичай становить від 1 кОм до сотень кОм.

Термістори NTC 2,5 Ом, 5ох, 10ох, 100ох & 3950, 3435

5K B value 3270 1% Freezer temperature sensor probe

NTC temperature sensor 10K B3950 M4 surface mount

Thermistors are a special electronic component whose resistance value changes with temperature. According to the different temperature coefficients, thermistors are mainly divided into two categories: negative temperature coefficient thermistors (NTC) and positive temperature coefficient thermistors (PTC).

Resistance range and application of NTC thermistors
The resistance range of NTC thermistors is quite wide, ranging from tens of ohms to ten thousand ohms. У практичних застосуваннях, we often encounter resistance values ​​of 2.5Ω, 5ох, 10ох, тощо. These resistance values ​​are not fixed, and they will show a certain regularity with temperature changes. Specifically, при підвищенні температури, the resistance of the NTC thermistor will decrease; навпаки, when the temperature decreases, the resistance will increase. This characteristic makes NTC thermistors widely used in the field of temperature measurement and control.

Крім того, the resistance error of the NTC thermistor is also an important parameter that we need to pay attention to. Common resistance errors are ±15%, ±20%, ±30%, тощо, which means that in practical applications, we need to select a suitable resistance error range according to specific needs to ensure the accuracy of measurement and control.

Resistance range and application of PTC thermistors
The resistance range of PTC thermistors is usually from 1KΩ to several hundred KΩ. Its resistance increases when the temperature rises, and it has high sensitivity and stability. PTC thermistors are often used in overcurrent, overvoltage protection and temperature sensors.

The difference between nominal resistance and actual resistance
When understanding the resistance range of thermistors, we also need to distinguish two concepts: nominal resistance and actual resistance. The nominal resistance usually refers to the resistance of the thermistor when the ambient temperature is 25°C, while the actual resistance is the resistance measured under certain temperature conditions. Due to factors such as changes in ambient temperature and aging of the component itself, the actual resistance may deviate from the nominal resistance. Отже, in practical applications, we need to select and adjust according to the specific situation.

Якщо коротко, as an important electronic component, thermistors are widely used in various fields. By understanding their resistance range and change rules, we can better select and use thermistors to meet the needs of different scenarios.