SB-0045 in stock German SB-0045 electrical components SB-0045 inventory

SB-0045 electrical component is a varactor diode, also known as a "variable reactance diode," manufactured by utilizing the characteristic where the junction capacitance of a PN junction changes with applied voltage under reverse bias. As the reverse bias voltage increases, the junction capacitance decreases; conversely, it increases. The capacitance of a varactor diode is generally small, with a maximum value ranging from tens of pF to hundreds of pF. It is mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, such as serving as a variable capacitor in the tuning circuit of a television receiver. Main parameters include: zero-bias junction capacitance, zero-bias quality factor, reverse breakdown voltage, center reverse bias voltage, nominal capacitance, capacitance variation range (in picofarads), and cutoff frequency.

SB-0045 electrical component principle

The absorption film irradiated by infrared rays is a thin film with low heat capacity, allowing its temperature to rise easily. A cavity structure is located directly below the center of the substrate, ensuring a temperature difference between the cold end and the measuring end. The thermocouple consists of polysilicon and aluminum connected in series. When the temperature at the measuring end of each thermocouple rises, a thermoelectromotive force Vn is generated between the thermocouples, so the sum of their voltages can be obtained at the output terminal.

SB-0045 electrical component characteristics

Sensitivity refers to the ratio of the change in output to the change in input of a sensor under steady-state operating conditions. It is the slope of the output-input characteristic curve. If there is a linear relationship between the sensor's output and input, then the sensitivity S is a constant. Otherwise, it will vary with changes in the input. The dimension of sensitivity is the ratio of the dimensions of the output and input quantities. When the dimensions of the sensor's output and input are the same, sensitivity can be understood as the amplification factor. Increasing sensitivity yields higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range, and stability often deteriorates.

SB-0045 electrical component function

In DC circuits, a capacitor acts as an open circuit. A capacitor is a component capable of storing electric charge and is one of the most commonly used electronic components. Starting with the structure of a capacitor, the simplest capacitor consists of two end plates and an insulating dielectric medium in between (including air). After energization, the plates become charged, forming a voltage (potential difference). However, due to the insulating material in between, the entire capacitor does not conduct electricity. This holds true provided the critical voltage (breakdown voltage) of the capacitor is not exceeded. We know that any material is relatively insulating; when the voltage across a material increases to a certain level, the material becomes conductive. We call this voltage the breakdown voltage. Capacitors are no exception; once a capacitor breaks down, it is no longer an insulator. However, at the secondary education level, such voltages are not encountered in circuits, so they operate below the breakdown voltage and can be regarded as insulators. In AC circuits, however, the direction of current changes over time according to a specific functional relationship. The charging and discharging process of a capacitor takes time, during which a changing electric field forms between the plates, and this electric field is also a function of time. In reality, current passes through the capacitor in the form of an electric field.

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