Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Transistor Current Components DefinitionThe current components in a transistor include emitter current (IE), base current, and collector current.In NPN transistors, current flows due to electrons, while in PNP transistors, it flows due to holes, resulting in opposite current directions. Let’s explore the current components in a PNP transistor with a common base configuration. The emitter-base junction (JE) is forward biased, and the collector-base junction (JC) is reverse biased. The figure show

What is a Phototransistors?Phototransistor DefinitionA phototransistor is defined as a semiconductor device with a light-sensitive base region, designed specifically for detecting and amplifying light signals.Phototransistors are semiconductor devices with either three terminals (emitter, base, and collector) or two terminals (emitter and collector) and have a light-sensitive base region. While all transistors are somewhat light-sensitive, phototransistors are specifically optimized for light de

Transistor DefinitionA transistor is defined as a semiconductor device with three terminals (Emitter, Base, and Collector) and two junctions (Base-Emitter and Base-Collector).Transistor is a semiconductor device with three terminals: Emitter (E), Base (B), and Collector (C). It has two junctions: Base-Emitter (BE) and Base-Collector (BC). Transistors operate in three regions: cutoff (fully off), active (amplifying), and saturation (fully on).When transistors operate in the active region, they ac

BJT DefinitionA Bipolar Junction Transistor (also known as a BJT or BJT Transistor) is a three-terminal semiconductor device consisting of two p-n junctions which are able to amplify or magnify a signal. It is a current controlled device. The three terminals of the BJT are the base, the collector and the emitter. A BJT is a type of transistor that uses both electrons and holes as charge carriers.A signal of small amplitude if applied to the base is available in the amplified form at the collecto

Transistor DefinitionA transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.Diffused TechniqueThis method creates planar transistors on a nearly flat wafer. An N-type wafer is heated in a furnace with P-type gas impurities, causing the P-type region (base) to form on the wafer. A mask with holes is used, and the wafer is heated again with N-type impurities. This creates the N-type region (emitter) on top of the P-type layer.At last, a thin layer

What are Transistor Characteristics ?Transistor Characteristics define the relationship between the current and voltages in various transistor configurations. These configurations, similar to two-port networks, are analyzed through characteristic curves, categorized as follows:Input Characteristics: These describe the changes in input current with the variation in the values of input voltage keeping the output voltage constant.Output Characteristics: This is a plot of output current versus outpu

Transistor DefinitionA transistor is defined as a semiconductor device used to amplify or switch electronic signals.Types of TransistorsThere are two main types of transistors: Bipolar Junction Transistors (BJTs) and Field Effect Transistors (FETs).BJTsThese are current-controlled devices with three terminals (Emitter, Base, Collector) and can be further classified into various types like Heterojunction Bipolar Transistors and Darlington Transistors.FETsThese are voltage-controlled devices with

How Dose a Transistor Work?Transistor DefinitionA transistor is defined as a semiconductor device used to amplify or switch electronic signals.There are different types of transistors available, but we’ll focus on the NPN transistor in common emitter mode. This type has a heavily doped and wide emitter region, which contains many free electrons (majority carriers). The collector region is wide and moderately doped, so it has fewer free electrons than the emitter. The base region is very thin and

Bipolar Junction Transistor DefinitionA Bipolar Junction Transistor (BJT) is a three-terminal device. It can function as either an amplifier or a switch, requiring one input circuit and one output circuit. To handle this with only three terminals, one terminal serves as a common connection for both input and output. The choice of the common terminal depends on the application. There are three types of transistor connections: common base, common emitter, and common collector. Common Base Transist

What is a NPN Transistor?NPN Transistor DefinitionAn NPN transistor is a widely used type of bipolar junction transistor, where a P-type semiconductor layer is flanked by two N-type layers. Construction of NPN TransistorAs discussed above, the NPN transistor has two junctions and three terminals. The construction of the NPN transistor is as shown in the below figure. The emitter and collector layers are wider compared to the base. The emitter is heavily doped. Therefore, it can inject a large n