wago electrical components Germany wago model wago price

wago electrical component is a photodetector that converts light into current or voltage signals depending on the mode of use. The die often uses a PN junction with photosensitive characteristics, which is very sensitive to changes in light, has unidirectional conductivity, and changes its electrical properties when the light intensity varies. Therefore, the current in the circuit can be changed by varying the light intensity. Photodiodes are also called photoelectric diodes. Photodiodes are similar in structure to semiconductor diodes; their die is a PN junction with photosensitive characteristics and has unidirectional conductivity, so they need to be operated with reverse bias. When there is no illumination, there is a very small saturated reverse leakage current, i.e., dark current, and the photodiode is cut off. When illuminated, the saturated reverse leakage current increases significantly, forming a photocurrent that varies with the intensity of the incident light. When light irradiates the PN junction, it generates electron-hole pairs in the PN junction, increasing the density of minority carriers. These carriers drift under reverse bias, increasing the reverse current. Therefore, the current in the circuit can be changed by varying the light intensity.

wago electrical component parameters

The main parameters of transistors include current amplification factor, power dissipation, frequency characteristics, maximum collector current, maximum reverse voltage, and reverse current. Amplification factor: The DC current amplification factor, also known as the static current amplification factor or DC amplification ratio, refers to the ratio of the transistor collector current to the base current when there is no changing signal input in the static state. AC amplification factor: The AC amplification factor, also known as the AC current amplification factor or dynamic current amplification factor, refers to the ratio of the change in transistor collector current to the change in base current in the AC state. Power dissipation: Power dissipation, also known as the maximum allowable collector power dissipation PCM, refers to the maximum collector power dissipation when the transistor parameters do not exceed the specified allowable values. Power dissipation is closely related to the maximum allowable junction temperature and the maximum collector current of the transistor. During use, the actual power consumption of the transistor must not exceed the PCM value, otherwise the transistor will be damaged due to overload. When the operating frequency of the transistor exceeds the cutoff frequency, its current amplification factor will decrease as the frequency increases. The maximum oscillation frequency refers to the frequency at which the power gain of the transistor drops to 8. Generally, the maximum oscillation frequency of high-frequency transistors is lower than the common-base cutoff frequency, while the characteristic frequency is higher than the common-base cutoff frequency and lower than the common-collector cutoff frequency. Maximum current: The maximum collector current refers to the maximum current allowed to pass through the transistor collector. Maximum reverse voltage: The maximum reverse voltage refers to the highest operating voltage allowed to be applied to the transistor during operation. It includes the collector-emitter reverse breakdown voltage, collector-base reverse breakdown voltage, and emitter-base reverse breakdown voltage. Collector reverse breakdown voltage refers to the maximum allowable reverse voltage between the collector and emitter when the transistor base is open. Base reverse breakdown voltage refers to the maximum allowable reverse voltage between the collector and base when the transistor emitter is open. Emitter reverse breakdown voltage refers to the maximum allowable reverse voltage between the emitter and base when the transistor collector is open. The reverse current between the bases, also known as the collector junction reverse leakage current, refers to the reverse current between the collector and base when the transistor emitter is open. The reverse breakdown current between the emitters refers to the reverse leakage current between the collector and emitter when the transistor base is open, also known as the penetration current. The smaller this current value, the better the performance of the transistor.

wago electrical component applications

The collector-emitter current can be regarded as being controlled by the base-emitter current, which is equivalent to treating the bipolar transistor as a "current-controlled" device. It can also be viewed as being controlled by the emitter junction voltage, i.e., as a "voltage-controlled" device. In fact, these two perspectives are interconnected through the current-voltage relationship across the base-emitter junction, which can be represented by the current-voltage curve of the PN junction. In analog circuit design, the current-controlled perspective is sometimes adopted because, within a certain range, the bipolar transistor exhibits approximately linear characteristics. In this range (referred to below as the "active region"), the collector current is approximately equal to a multiple of the base current, which greatly facilitates problem analysis and control of circuit functions. When designing some basic circuits, it is assumed that the emitter-base voltage is an approximately constant value, in which case the collector current is approximately equal to a multiple of the base current, and the transistor acts as a current amplifier. However, in reality, the bipolar transistor is a more complex nonlinear device, and improper bias voltage distribution will cause distortion of the output signal. Furthermore, even when operating within a specific range, its current amplification factor is affected by factors including temperature. To design precise and reliable bipolar transistor circuits, the voltage-controlled perspective must be adopted. The voltage-controlled model introduces an exponential function to describe the voltage-current relationship; within a certain range, the functional relationship is approximately linear, allowing the transistor to be treated as a conductance element. Thus, the design of circuits such as differential amplifiers is simplified to a linear problem, so the approximate voltage-controlled perspective is often selected. For translinear circuits, studying their current-voltage curves is crucial for analyzing device operation, so they are usually treated as a voltage-controlled model where the transconductance is proportional to the collector current. Transistor-level circuit design mainly uses SPICE or other similar analog circuit simulators, so the complexity of the model does not pose a significant problem for designers. However, when manually analyzing analog circuit problems, it is not always possible to adopt exact calculation methods as in classical circuit analysis, so approximate methods are necessary.

wago electrical component functions

The main function of ferrite beads is to eliminate RF noise present in transmission line structures (circuits). RF energy is the AC sinusoidal component superimposed on the DC transmission level, where the DC component is the desired useful signal. To eliminate this unwanted signal energy, chip ferrite beads act as high-frequency resistors (attenuators). Ferrite beads have high resistivity and permeability; they are equivalent to a resistor and an inductor in series, but both the resistance and inductance values vary with frequency. They have better high-frequency filtering characteristics than ordinary inductors, exhibiting resistive behavior at high frequencies, thus maintaining high impedance over a relatively wide frequency range and improving FM filtering effects. Inductors can be used for power supply filtering. The circuit symbol for a ferrite bead is the same as that for an inductor, but the model number indicates that a ferrite bead is used. In terms of circuit function, ferrite beads and inductors operate on the same principle, differing only in their frequency characteristics. The DC component is the desired useful signal, while RF RF energy is useless electromagnetic interference transmitted and radiated along the line. To eliminate this unwanted signal energy, chip ferrite beads act as high-frequency resistors (attenuators), allowing DC signals to pass while filtering out AC signals. Ferrite beads have high resistivity and permeability, equivalent to a resistor and an inductor in series. In the circuit, the wire simply passes through it. High-frequency currents dissipate as heat within it; its equivalent circuit is an inductor and a resistor in series, with the values of both components proportional to the length of the ferrite bead. Some ferrite beads have multiple holes; passing the wire through them increases the component impedance (proportional to the square of the number of passes through the bead). Ferrite beads can not only be used in power supply circuits to filter high-frequency noise (suitable for DC and AC outputs) but are also widely used in other circuits.

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