ช่วงความต้านทานและการประยุกต์ใช้เทอร์มิสเตอร์

‌ ช่วงความต้านทานของเทอร์มิสเตอร์นั้นกว้าง, และความต้านทานของเทอร์มิสเตอร์ NTC มีตั้งแต่หลายสิบโอห์มถึงหนึ่งหมื่นโอห์ม, และแม้กระทั่งอุปกรณ์พิเศษก็สามารถปรับแต่งได้ตามความต้องการ. ค่าความต้านทานที่ใช้กันทั่วไปคือ 2.5Ω, 5โอ้, 10โอ้, 100โอ้, ฯลฯ, และข้อผิดพลาดด้านความต้านทานทั่วไปคือ ± 15%, ±20%, ±30%, ฯลฯ. ช่วงความต้านทานของเทอร์มิสเตอร์ PTC โดยทั่วไปคือตั้งแต่ 1KΩ ถึงหลายร้อย KΩ.

เทอร์มิสเตอร์ชนิด NTC 2.5Ω, 5โอ้, 10โอ้, 100โอ้ & 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 (กทช) and positive temperature coefficient thermistors (พีทีซี).

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. In practical applications, we often encounter resistance values ​​of 2.5Ω, 5โอ้, 10โอ้, ฯลฯ. These resistance values ​​are not fixed, and they will show a certain regularity with temperature changes. Specifically, when the temperature rises, the resistance of the NTC thermistor will decrease; conversely, when the temperature decreases, the resistance will increase. This characteristic makes NTC thermistors widely used in the field of temperature measurement and control.

นอกจากนี้, 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%, ฯลฯ, 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. ดังนั้น, in practical applications, we need to select and adjust according to the specific situation.

In short, 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.