fairchild semiconductor electrical components Germany fairchild semiconductor model fairchild semiconductor price

fairchild semiconductor electrical components are electronic devices with three terminals, made of three parts of semiconductors with different doping levels. The charge flow in transistors is mainly due to the diffusion and drift movement of carriers at the PN junction. The operation of this transistor involves the flow of both electrons and holes, so it is called bipolar, also known as a bipolar junction transistor. This mode of operation differs from unipolar transistors such as field-effect transistors, whose operation involves only the drift action of a single type of carrier. The boundary between two regions with different dopants is formed by the PN junction. Bipolar transistors can amplify signals and have good power control, high-speed operation, and durability, so they are often used to form amplifier circuits or drive devices such as speakers and motors, and are widely used in aerospace engineering, medical devices, robotics, and other applications.

fairchild semiconductor electrical component features

Mercury switches achieve on/off switching through the movement of mercury enclosed in a glass or metal housing. Therefore, compared with mechanical switches, mercury switches have many characteristics: (1) Can be used in harsh environmental conditions. Since the mercury switch is sealed, the internal mercury is isolated from the outside, so it can be used in environments with oil, steam, dust, and corrosive gases. (2) Small external force required for switching. Mercury is the only metal that remains liquid at room temperature; it has high surface tension and specific gravity. Only a slight external force is needed to tilt the mercury switch, causing the mercury to move and achieve on/off switching. (3) Mercury has good conductivity, and the contact resistance between the electrodes of the mercury switch is generally very small. (4) The current allowed to pass through the mercury switch depends on the electrode material. (5) Since the on/off state of the mercury switch is determined by the gravity of the mercury, it can work reliably for a long time. (6) The electrode contacts are liquid contacts, producing no noise. (7) Since mercury can flow, as long as the acceleration exceeds the set value, the mercury switch can turn on or off, so it can be used as a vibration-sensitive element. (8) Small size, diverse forms, and fully sealed device. (9) Simple structure and low price. (10) High quality, premium products, suitable for beginners

fairchild semiconductor electrical component principle

The main principle of a diode is to utilize the unidirectional conductivity of the PN junction. Adding leads and packaging to the PN junction forms a diode. A crystal diode consists of a PN junction formed by P-type semiconductor and N-type semiconductor. A space charge layer is formed on both sides of the interface, establishing a built-in electric field. When there is no external voltage, the diffusion current caused by the carrier concentration difference across the PN junction equals the drift current caused by the built-in electric field, resulting in an electrical equilibrium state. When a forward voltage bias is applied externally, the mutual cancellation of the external electric field and the built-in electric field increases the diffusion current of carriers, causing a forward current. When a reverse voltage bias is applied externally, the external electric field and the built-in electric field are further strengthened, forming a reverse saturation current within a certain reverse voltage range that is independent of the reverse bias voltage value. When the applied reverse voltage reaches a certain level, the electric field strength in the space charge layer of the PN junction reaches a critical value, causing a carrier multiplication process. This generates a large number of electron-hole pairs, resulting in a large reverse breakdown current, known as the diode breakdown phenomenon. Reverse breakdown of the PN junction is classified into Zener breakdown and avalanche breakdown.

fairchild semiconductor electrical component applications

Semiconductor diodes are used in almost all electronic circuits. The use of semiconductor diodes in circuits can protect the circuit and extend its service life. The development of semiconductor diodes has optimized integrated circuits and played a positive role in various fields. Diodes play many roles in integrated circuits, maintaining their normal operation. The following briefly introduces the roles of diodes in the following four types of circuits. (1) Switching circuit: In digital and integrated circuits, the unidirectional conductivity of diodes is used to achieve circuit conduction or disconnection. This technology has been widely applied. Switching diodes can effectively protect circuits from damage due to short circuits and other issues, and can also realize the functions of traditional switches. Another characteristic of switching diodes is their fast switching speed, which is incomparable to traditional switches. (2) Limiter circuit: In electronic circuits, limiter circuits are commonly used to process various signals. They are used to selectively transmit part of the signal within a preset voltage level range. Most diodes can be used for limiting, but sometimes specialized limiter diodes are required, such as when protecting instruments. (3) Voltage regulation circuit: Zener diodes are typically used in voltage regulation circuits. They are junction-type silicon semiconductor diodes manufactured using special processes. These special diodes have high impurity concentrations and high charge density in the space charge region, making it easy to form a strong electric field. When the reverse voltage across the Zener diode reaches a certain value, the reverse current increases sharply, causing reverse breakdown. (11) Varactor circuit: Varactor diodes are commonly used in varactor circuits to achieve automatic frequency control, tuning, frequency modulation, and scanning oscillation.

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