Thermistor NTC 10kΩ

NTC Thermistor (10kΩ)

An NTC (Negative Temperature Coefficient) thermistor is a type of temperature sensor that exhibits a decrease in resistance as the temperature increases. The 10kΩ NTC thermistor is a common specification used in a variety of applications for temperature sensing and measurement.

Key Features:

• Resistance at 25°C: 10,000 ohms (10kΩ)
• Temperature Coefficient: Typical negative temperature coefficient (temperature coefficient value varies by manufacturer).
• Temperature Range: Commonly used in ranges from -40°C to +125°C or higher, depending on the specific thermistor.
• Sensitivities: Varies based on the specific thermistor design but generally provides fast response times to temperature changes.

Electrical Characteristics:

• Beta Value (β): The beta value is a characteristic of the thermistor that represents the relationship between resistance and temperature. Common beta values for 10kΩ thermistors might be around 3000K to 4000K.
  • The beta value can be used in the equation:
    [ R(T) = R(T_0) \times e^{\frac{B}{T_0} \left( \frac{1}{T} – \frac{1}{T_0} \right)} ] Where:
    • ( R(T) ): Resistance at temperature ( T ) (in Kelvin)
    • ( R(T_0) ): Resistance at reference temperature ( T_0 ) (usually 298K for 25°C)
    • ( B ): Beta value
• Tolerance: Typically +/- 1%, +/- 5%, or +/- 10%, depending on the manufacturer.

Applications:

• Temperature Measurement: Commonly used in HVAC systems, medical devices, and consumer electronics for temperature sensing.
• Temperature Compensation: Used in circuits where temperature compensation is critical (e.g., in sensor circuits, analog devices).
• Temperature Control Systems: Employed in systems that require accurate temperature monitoring and control.
• Aquarium Heaters and Refrigerators: Useful for monitoring water temperature in aquariums or food storage temperatures in refrigerators.

Circuit Connection:

• Voltage Divider Configuration: The NTC thermistor is often connected in series with a fixed resistor to create a voltage divider. The output voltage is then sent to an ADC (Analog-to-Digital Converter) or microcontroller for temperature measurement.

Example Voltage Divider:

1. Connect the NTC thermistor in series with a fixed resistor (R).
2. Connect one end to the power supply (Vs).
3. Connect the junction between the thermistor and the resistor to the input of the microcontroller or ADC.
4. Connect the other end of the fixed resistor to ground.

Voltage Divider Output: [ V_{out} = V_s \cdot \frac{R}{R + R_{thermistor}} ] Where ( R_{thermistor} ) changes with temperature.

Important Notes:

• Self-Heating: Be cautious of self-heating effects, especially in high-resistance thermistors where the power dissipation can affect accuracy.
• Calibration: Calibration may be necessary to ensure accuracy within desired temperature ranges depending on the application.
• Packaging: Available in various forms such as bead, disk, or chip packages. Select the appropriate package based on application requirements