1. The term “sensitive resistor” denotes a resistor that reacts to various external factors, including temperature, humidity, pressure, and other variables. Due to the diverse range of influencing elements, sensitive resistors are classified in numerous ways. Here, I’ll outline some common classifications.
1. Thermistor.
A thermistor is a type of resistor highly sensitive to temperature variations. Typically crafted from single crystal or polycrystalline semiconductor materials, thermistors come in various types. Among these, the negative temperature coefficient thermistor exhibits decreasing resistance with rising temperature, while the positive temperature coefficient thermistor showcases an increase in resistance with temperature elevation.
The categorization extends to the rate and extent of resistance alteration concerning temperature. It can be classified into two main types: gradual and abrupt change. Heating methods further distinguish between direct and indirect heating. Additionally, thermistors vary in shape and structure, encompassing rod, disc, square, bead, linear tube, thin film, and thick film designs. Key characteristics include high temperature sensitivity, low thermal inertia, longevity, compact size, and simple construction. Thermistors find widespread application in temperature measurement, control systems, fire alarms, meteorological instrumentation, as well as microwave and laser power measurement.
2. Photoresistor.
A photoresistor operates based on semiconductor light effect principles, manifesting changes in resistance in response to incident light intensity variations. Typically comprising glass substrates, photosensitive layers, and electrodes, photoresistors exist in polycrystalline and single-crystal variants. Further differentiation based on spectral sensitivity yields ultraviolet, visible light, and infrared photoresistors. Selenium, cadmium sulfide, cadmium selenide, and zinc sulfide are common materials employed in various photoelectric automatic control systems.
3. Varistor.
A varistor, functioning as a sensitive resistor, experiences a sharp decline in resistance when subjected to a certain voltage. Classification is based on constituent materials, including silicon carbide, silicon, metal oxide, and barium titanate varistors, and on structural differences, such as bulk, junction, single-particle laminated, and thin-film varieties. Varistors are characterized by parameters like nominal voltage, nominal current, nonlinear coefficient, current capacity, and voltage temperature coefficient. They are predominantly utilized in overvoltage protection and voltage stabilization circuits.
4. Magnetoresistance.
Also known as magnetron resistance, magnetoresistance exploits the magnetoresistance effect, showcasing a distinctive trait: in weak magnetic fields, resistance exhibits sensitivity increasing according to the square of the magnetic field. However, determining the magnetic field’s direction poses a challenge, and the resistance undergoes significant changes with temperature fluctuations. This technology has made significant strides in non-contact switch fabrication, contributing to advancements in measurement, automatic control, and signal processing.
Thank you for your attention. WellCircuits Limited, a professional PCB & PCBA manufacturer based in China, provides high-quality rigid PCB, flexible circuits, rigid-flex PCB, HDI PCB, and Rogers PCB fabrication services. For PCB prototype quotations, please contact us at [email protected].
1. Thermistor.
A thermistor is a type of resistor highly sensitive to temperature variations. Typically crafted from single crystal or polycrystalline semiconductor materials, thermistors come in various types. Among these, the negative temperature coefficient thermistor exhibits decreasing resistance with rising temperature, while the positive temperature coefficient thermistor showcases an increase in resistance with temperature elevation.
The categorization extends to the rate and extent of resistance alteration concerning temperature. It can be classified into two main types: gradual and abrupt change. Heating methods further distinguish between direct and indirect heating. Additionally, thermistors vary in shape and structure, encompassing rod, disc, square, bead, linear tube, thin film, and thick film designs. Key characteristics include high temperature sensitivity, low thermal inertia, longevity, compact size, and simple construction. Thermistors find widespread application in temperature measurement, control systems, fire alarms, meteorological instrumentation, as well as microwave and laser power measurement.
2. Photoresistor.
A photoresistor operates based on semiconductor light effect principles, manifesting changes in resistance in response to incident light intensity variations. Typically comprising glass substrates, photosensitive layers, and electrodes, photoresistors exist in polycrystalline and single-crystal variants. Further differentiation based on spectral sensitivity yields ultraviolet, visible light, and infrared photoresistors. Selenium, cadmium sulfide, cadmium selenide, and zinc sulfide are common materials employed in various photoelectric automatic control systems.
3. Varistor.
A varistor, functioning as a sensitive resistor, experiences a sharp decline in resistance when subjected to a certain voltage. Classification is based on constituent materials, including silicon carbide, silicon, metal oxide, and barium titanate varistors, and on structural differences, such as bulk, junction, single-particle laminated, and thin-film varieties. Varistors are characterized by parameters like nominal voltage, nominal current, nonlinear coefficient, current capacity, and voltage temperature coefficient. They are predominantly utilized in overvoltage protection and voltage stabilization circuits.
4. Magnetoresistance.
Also known as magnetron resistance, magnetoresistance exploits the magnetoresistance effect, showcasing a distinctive trait: in weak magnetic fields, resistance exhibits sensitivity increasing according to the square of the magnetic field. However, determining the magnetic field’s direction poses a challenge, and the resistance undergoes significant changes with temperature fluctuations. This technology has made significant strides in non-contact switch fabrication, contributing to advancements in measurement, automatic control, and signal processing.
Thank you for your attention. WellCircuits Limited, a professional PCB & PCBA manufacturer based in China, provides high-quality rigid PCB, flexible circuits, rigid-flex PCB, HDI PCB, and Rogers PCB fabrication services. For PCB prototype quotations, please contact us at [email protected].
