451950 in stock German 451950 electrical components 451950 inventory

451950 electrical components refer to electronic components that generate resonant frequencies, commonly divided into quartz crystal resonators and ceramic resonators. They function to generate frequencies and feature stability and good anti-interference performance, making them widely used in various electronic products. The frequency accuracy of quartz crystal resonators is higher than that of ceramic resonators, but their cost is also higher. Resonators mainly serve the role of frequency control; all electronic products involving frequency transmission and reception require resonators. Based on their form factor, resonators can be classified into two types: through-hole and surface-mount.

451950 Electrical Component Classification

(1) Point-contact diodes have a small PN junction contact area, cannot pass large forward currents or withstand high reverse voltages, but offer good high-frequency performance, making them suitable for use in high-frequency detection circuits and switching circuits. (2) Surface-contact diodes have a large PN junction contact area, can pass large currents, and can withstand high reverse voltages, making them suitable for use in rectifier circuits. (3) Planar diodes have a small PN junction area when used as switching transistors in pulse digital circuits, and a larger PN junction area when used for high-power rectification. (4) Zener diodes are a special type of surface-contact semiconductor silicon diode that provides voltage stabilization. The main difference between zener diodes and ordinary diodes is that zener diodes operate in the reverse breakdown state of the PN junction. By implementing process measures during manufacturing and limiting the magnitude of reverse current during use, it is ensured that the zener diode will not be damaged by overheating in the reverse breakdown state. Unlike general diodes, the reverse breakdown of a zener diode is reversible; as long as the current does not exceed the allowable value for the zener diode, the PN junction will not overheat and fail. When the external reverse voltage is removed, the zener diode restores its original performance, so zener diodes have good repetitive breakdown characteristics. (5) Photodiodes, also known as photosensitive diodes, have a glass window on their casing to facilitate light reception. Their characteristic is that when light irradiates their PN junction, free electrons and holes are generated in pairs, increasing the concentration of minority carriers in the semiconductor. Under a certain reverse bias voltage, this causes the reverse current to increase. Therefore, their reverse current increases linearly with increasing light intensity. When there is no light illumination, the volt-ampere characteristics of a photodiode are the same as those of an ordinary diode. As light-controlled components, photodiodes can be used for various object detection, photoelectric control, automatic alarm systems, etc. When manufactured as large-area photodiodes, they can serve as an energy source and are called solar cells. In this case, they do not require an external power supply and can directly convert light energy into electrical energy. (6) Light-emitting diodes (LEDs) are solid-state semiconductor display devices that directly convert electrical energy into light energy, abbreviated as LED. Similar to ordinary diodes, light-emitting diodes are also composed of a PN structure. The PN junction of an LED is encapsulated in a transparent plastic shell, with shapes including square, rectangular, and circular. LEDs have advantages such as low drive voltage, small operating current, strong resistance to vibration and shock, small size, high reliability, low power consumption, and long service life, making them widely used in signal indication circuits. In electronic technology, common numeric displays utilize LEDs. The principle of LEDs is opposite to that of photodiodes. When an LED is forward-biased and current passes through it, it emits light due to the energy released when electrons and holes recombine directly. Its spectral range is relatively narrow, and its wavelength depends on the base material used.

451950 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 the relationship between the sensor's output and input is explicitly linear, 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 quantities are the same, sensitivity can be understood as the amplification factor. Increasing sensitivity yields higher measurement precision. However, the higher the sensitivity, the narrower the measurement range, and often the poorer the stability.

451950 Electrical Component Structure

The rated current of the fuse element is not equal to the rated current of the fuse. The rated current of the fuse element is selected based on the load current of the protected equipment, while the rated current of the fuse should be greater than the rated current of the fuse element and determined in coordination with the main electrical appliance. A fuse mainly consists of 3 parts: the fuse element, the housing, and the support. Among these, the fuse element is the key component controlling the fusing characteristics. The material, dimensions, and shape of the fuse element determine the fusing characteristics. Fuse element materials are divided into two categories: low melting point and high melting point. Low melting point materials, such as lead and lead alloys, have low melting points and melt easily. Due to their higher resistivity, they are made with larger cross-sectional dimensions, generating more metal vapor during fusing, and are only suitable for fuses with low breaking capacity. High melting point materials, such as copper and silver, have high melting points and do not melt easily. However, due to their lower resistivity, they can be made with smaller cross-sectional dimensions than low melting point elements, generating less metal vapor during fusing, making them suitable for fuses with high breaking capacity. The shape of the fuse element is divided into wire-type and strip-type. Changing the shape of the variable cross-section can significantly alter the fusing characteristics of the fuse. Fuses have various different fusing characteristic curves, allowing them to meet the needs of different types of protected objects.

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