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SEMITEC - Model NT-4 Series -Thermistor - High Temperature, High Sensitivity, Glass Encapsulated
SEMITEC's NT-4 series thermistors are designed for applications requiring high heat resistance and sensitivity. These thermistors are smaller in form factor and provide faster response times than conventional thermistors, enhancing reliability in sensing applications. They are glass encapsulated to withstand high temperatures, complying with RoHS DIRECTIVE 2011/65/EU. Ideal for use in 3D printers, HVAC systems, water heaters, home appliances, automotive electronics, and medical devices, among others, these thermistors function by changing resistance with temperature variations. They are composed of ceramic semiconductors from metal oxides, offering flexibility in shape and properties due to diverse manufacturing methods. When used with fixed resistors in circuits, they help linearize output voltage variations for more precise temperature detection across a specified range.
Semitec’s glass encapsulated NT-4 series thermistor features high heat resistance and high sensitivity. Compared with conventional thermistors, the NT-4 thermistors are smaller, faster in response, and more reliable which makes them suitable for various applications. SEMITEC’S NT thermistors are fully compliant with RoHS DIRECTIVE2011/65/EU.
3D printers, HVAC equipment, water heaters, microwave ovens, home appliances, hybrid vehicles, fuel cell vehicles, automotive electronics, medical, disaster prevention, security, office automation, other high-temperature, high-speed sensing applications
Thermistor is a generic term for Thermally Sensitive Resistor, a semiconductor component whose resistance value changes significantly with changes in temperature.
An NTC thermistor whose resistance value decreases with increasing temperature (having a negative temperature coefficient) is generally called a thermistor.
Thermistors are ceramic semiconductors made mainly from metal oxides and sintered at high temperatures. Various shapes and properties are available depending on the manufacturing method and structure. They are widely used for temperature measurement and temperature compensation.
Figure 1 shows a typical circuit example when using a thermistor.
Fig. 1 Example of a circuit using a thermistor
One example of measuring temperature with a thermistor is to input the voltage between the terminals of the thermistor to an AD converter, convert it to a digital signal, and convert it to temperature using a microcontroller.
Since the resistance value change of a thermistor with respect to temperature is nonlinear, a circuit consisting of a thermistor and a fixed resistor connected in series, as shown in Figure 1, is used to linearize the voltage change of the output voltage Vth.
The thermistor output voltage Vth shown in Figure 1 is calculated as Vth = Vcc × Rth/(Rth + R), where Vcc is the power supply voltage, Rth is the resistance value of the thermistor, and R is the resistance value of the fixed resistor in series, to give the temperature detected by the thermistor.
The resistance R to be connected in series with the thermistor can be selected by the following formula based on the actual temperature range to be measured.