The transistor has three legs, the Collector (C), Base (B), and Emitter (E) . Sometimes they are labeled on the flat side of the transistor.
What are the three parts of a transistor?
There are typically three electrical leads in a transistor, called the emitter, the collector, and the base —or, in modern switching applications, the source, the drain, and the gate.
Why do transistors have 3 legs?
The transistor has three legs, these are the base, collector and the emitter. ... The base of the transistor is used to switch current through the collector and emitter . When the base is between 0V and 0.7V it is switched off and above 0.7V it is switched on allowing the current to flow from the collector to the emitter.
What are the three functions of a transistor?
A transistor is a kind of solid semiconductor device, which has many functions, such as detecting, rectifying, amplifying, switching, voltage stabilizing, signal modulating and so on. As a variable current switch, the transistor can control the output current based on the input voltage.
Which leg is transistor?
Transistors typically have one round side and one flat side. If the flat side is facing you, the Emitter leg is on the left, the Base leg is in the middle, and the Collector leg is on the right (note: some specialty transistors have different pin configurations than the TO-92 package described above).
What is a transistor symbol?
The Transistor is a semiconductor device provided with three terminals called base, emitter and collector. It is used to work in electronic circuits as a rectifier, amplifier and switch. These symbols can be represented inside a circle .
What is PNP and NPN transistor?
An NPN transistor has a piece of P -type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. ... NPN and PNP transistors have very similar schematic symbols. The only difference is the direction of the arrow on the emitter.
What is transistor with diagram?
Diagram ‘A’ shows an NPN transistor which is often used as a type of switch. A small current or voltage at the base allows a larger voltage to flow through the other two leads (from the collector to the emitter). The circuit shown in diagram B is based on an NPN transistor.
What does emitter mean in English?
/ (ɪˈmɪtə) / noun. a person or thing that emits . a radioactive substance that emits radiation a beta emitter. the region in a transistor in which the charge-carrying holes or electrons originate.
What is difference between transistor and thyristor?
Transistor and thyristor both are three-terminal devices i.e. they are 3-legged components. The 3 terminals of the transistor are collector, base and emitter. A signal at the base terminal controls the current flow between collector and emitter. In a thyristor, the three terminals are anode, gate and cathode.
What are the basic functions of a transistor?
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power . Transistors are one of the basic building blocks of modern electronics. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit.
What is the main use of a transistor?
Transistors are a three terminal semiconductor device used to regulate current, or to amplify an input signal into a greater output signal . Transistors are also used to switch electronic signals. The circulation of electrical current through all types of transistors is adjusted by electron addition.
What are the two basic types of transistors?
Transistors typically fall into two main types depending on their construction. These two types are bipolar junction transistors (BJT) and Field Effect Transistors (FET) .
What is the symbol of PNP transistor?
The PNP Transistor is denoted by the letters PNP . In the diagram below, the symbol for a PNP transistor is depicted. In a PNP transistor, the current flows from the emitter to the collector, as shown by the inward arrow.
How do I know if a transistor is bad?
A bad transistor can sometimes be detected by its partly burned or distorted appearance , but more often there is no visible indication. One approach to troubleshooting is to substitute a known good component, but that is a costly way to go.
How do you identify a transistor?
To help identify them, transistors are labeled with number and letters on their casings . Transistors are labeled according to the numbering system that is used. The primary numbering systems are JIS, Pro Electron, and JEDEC.
