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Questions and Answers
What is the main function of a transistor?
What is the main function of a transistor?
amplify current
A transistor is composed of a single diode.
A transistor is composed of a single diode.
False (B)
What is a key characteristic of semiconductor material used in transistors regarding external circuit connections?
What is a key characteristic of semiconductor material used in transistors regarding external circuit connections?
at least three terminals
What is the symbol for current gain?
What is the symbol for current gain?
MOSFETs are divided into which two types?
MOSFETs are divided into which two types?
What does the letter B stand for in the context of transistor leads?
What does the letter B stand for in the context of transistor leads?
What type of charge does the base have in an NPN transistor?
What type of charge does the base have in an NPN transistor?
What does a heat sink do for a transistor?
What does a heat sink do for a transistor?
The letter A in transistor coding usually stands for silicon.
The letter A in transistor coding usually stands for silicon.
In transistor coding, what does the letter 'C' typically mean?
In transistor coding, what does the letter 'C' typically mean?
What is the purpose of doping in semiconductors?
What is the purpose of doping in semiconductors?
What type of extrinsic semiconductor has a majority of electrons (negative)?
What type of extrinsic semiconductor has a majority of electrons (negative)?
What type of extrinsic semiconductor has a majority of carriers that are holes (positive)?
What type of extrinsic semiconductor has a majority of carriers that are holes (positive)?
What is an intrinsic semiconductor?
What is an intrinsic semiconductor?
Flashcards
Transistor
Transistor
A semiconductor device that amplifies or switches electronic signals.
NPN Transistor
NPN Transistor
A type of transistor with layers arranged as Negative-Positive-Negative.
PN Junction
PN Junction
The interface between the P-type and N-type semiconductor.
Current Gain
Current Gain
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Base Lead
Base Lead
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Collector Lead
Collector Lead
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Emitter Lead
Emitter Lead
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BJT
BJT
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JFET
JFET
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Heat Sink
Heat Sink
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Transistor Coding
Transistor Coding
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Silicon
Silicon
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Extrinsic Semiconductor
Extrinsic Semiconductor
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Doping
Doping
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N-Type Semiconductor
N-Type Semiconductor
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P-Type Semiconductor
P-Type Semiconductor
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Intrinsic Semiconductor
Intrinsic Semiconductor
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Saturation Mode
Saturation Mode
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Cut-off Mode
Cut-off Mode
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Modes of Transistors
Modes of Transistors
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Analog Signal
Analog Signal
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Digital Signal
Digital Signal
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Field Effect Transistor (FET)
Field Effect Transistor (FET)
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Amplifier
Amplifier
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Oscillator
Oscillator
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Voltage Rating
Voltage Rating
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Collector Current
Collector Current
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Amplification
Amplification
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Heat Generation
Heat Generation
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Study Notes
Semiconductor Devices: Transistors
- Transistors are semiconductor devices used to amplify current and act as switches.
- They are composed of two diodes (a PN junction) and are crucial for amplifying or switching electronic signals and power.
- Transistors require at least three terminals for external circuit connections.
- Current gain (hFE) is the amount of current amplification.
Transistor Types
- Transistors are categorized into Bipolar Junction Transistors (BJTs) and Field-Effect Transistors (FETs).
- BJTs are further classified into NPN and PNP types.
- NPN transistors are commonly used due to their ease of fabrication.
- The order of N, P, N in NPN transistors and P, N, P in PNP transistors refer to the arrangement of semiconductor layers.
Transistor Parts
- Base: The base is the control terminal; applying a voltage to it activates the transistor
- Collector: The collector collects the amplified current.
- Emitter: The emitter releases/emits the amplified current.
MOSFET Transistor
- A type of Field-Effect Transistor (FET)
- Divided into N-type and P-type transistors
Transistor Coding
- The coding of transistors provides information about the manufacturer, the transistor type, and its specifications, such as voltage ratings.
- Examples include BC108, TIP31A, 2N3053.
Transistor Applications
- Used as switches in various circuits to control the flow of current.
- Can amplify signals.
- Important components in many electronic circuits.
Transistor Selection
- Key properties for selection include maximum collector current (IC) and current gain (hFE).
- Manufacturers group transistors based on typical applications or maximum power ratings to easily choose appropriate devices.
Intrinsic vs Extrinsic Semiconductors
- Intrinsic: Pure semiconductors with very few impurities and limited conductivity
- Extrinsic: Semiconductors with added impurities (doping) to enhance conductivity in specific ways (N-type or P-type).
- N-type: Contains pentavalent impurities which introduce extra electrons
- P-type: Contains trivalent impurities which introduce holes
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Description
Transistors are semiconductor devices that amplify current and act as switches. They come in two main types: Bipolar Junction Transistors (BJTs) and Field-Effect Transistors (FETs). The order of N, P, N in NPN transistors and P, N, P in PNP transistors refer to the arrangement of semiconductor layers.
