ELEMAN electrical components Germany ELEMAN model ELEMAN price

ELEMAN electrical component is an electronic device with three terminals, made of three parts of semiconductors with different doping levels. The charge flow in the transistor 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 of a single type of carrier. The boundary between the two regions with different dopant concentrations 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.

ELEMAN electrical component classification

Printed circuit boards are classified into three major categories by layer count: single-sided, double-sided, and multilayer boards. First, single-sided boards: on the most basic PCB, components are concentrated on one side, and conductors on the other. Since conductors appear on only one side, this type of PCB is called a single-sided printed circuit board. Single-sided boards are usually simple to manufacture and low in cost, but their disadvantage is that they cannot be applied to overly complex products. Double-sided boards are an extension of single-sided boards; when single-layer routing cannot meet the needs of electronic products, double-sided boards are used. Both sides have copper cladding and traces, and vias can connect circuits between the two layers to form the required network connections. Multilayer boards refer to printed boards with more than three conductive graphic layers laminated with insulating materials in between, with interconnections between the conductive graphics as required. Multilayer printed circuit boards are the product of the development of electronic information technology toward high speed, multifunctionality, large capacity, small volume, thin profile, and lightweight. Printed circuit boards are classified by characteristics into flexible boards (FPC), rigid boards (PCB), and rigid-flex boards (FPCB).

ELEMAN electrical component classification

Thyristors have various classification methods: (1) Classification by turn-off, turn-on, and control methods: Thyristors can be divided into conventional thyristors, bidirectional thyristors, reverse-conducting thyristors, gate turn-off thyristors, BTG thyristors, temperature-controlled thyristors, and light-controlled thyristors, among others. (2) Classification by pins and polarity: Thyristors can be divided into two-terminal thyristors, three-terminal thyristors, and four-terminal thyristors according to their pins and polarity. (3) Classification by package type: Thyristors can be divided into metal-packaged thyristors, plastic-packaged thyristors, and ceramic-packaged thyristors. Among them, metal-packaged thyristors are further divided into bolt-type, flat-type, round-case type, etc.; plastic-packaged thyristors are divided into types with heat sinks and without heat sinks. (4) Classification by current capacity: Thyristors can be divided into high-power thyristors, medium-power thyristors, and low-power thyristors according to current capacity. Usually, high-power thyristors mostly use metal case packaging, while medium- and low-power thyristors mostly use plastic or ceramic packaging. (5) Classification by turn-off speed: Thyristors can be divided into conventional thyristors and high-frequency (fast) thyristors according to their turn-off speed. (6) Zero-crossing triggering - generally for power regulation, i.e., triggering occurs when the phase of the sinusoidal AC voltage crosses zero; triggering must occur at the zero crossing to turn on the thyristor. (7) Non-zero-crossing triggering - the thyristor can be triggered to turn on regardless of the phase of the AC voltage; common is phase-shift triggering, i.e., changing the output percentage by changing the conduction angle (phase angle) of the sinusoidal AC.

ELEMAN electrical component classification

1, fuse resistor: also called a fusible resistor, it serves the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes its power to exceed the rated power, it will blow like a fuse to disconnect the connected circuit. Fuse resistors generally have small resistance values and low power ratings. 3, sensitive resistors: refer to resistors whose resistance values are sensitive to certain physical quantities (such as temperature, humidity, light, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance value of the sensitive resistor changes accordingly, presenting different resistance values. According to sensitivity to different physical quantities, sensitive resistors can be divided into thermistors, humidity-sensitive resistors, photoresistors, varistors, force-sensitive resistors, magnetoresistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductor materials, so these resistors are also called semiconductor resistors. The resistance of a thermistor changes with temperature; if the resistance decreases as temperature rises, it is a negative temperature coefficient thermistor. Negative temperature coefficient thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. A photoresistor's resistance changes with the intensity of incident light; when incident light increases, the resistance of the photoresistor decreases, and when incident light weakens, the resistance increases.

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