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Sunday, 26 June 2011

Types

Types

BJT PNP symbol.svg PNP JFET P-Channel Labelled.svg P-channel
BJT NPN symbol.svg NPN JFET N-Channel Labelled.svg N-channel
BJT
JFET
BJT and JFET symbols
JFET P-Channel Labelled.svg IGFET P-Ch Enh Labelled.svg IGFET P-Ch Enh Labelled simplified.svg IGFET P-Ch Dep Labelled.svg P-channel
JFET N-Channel Labelled.svg IGFET N-Ch Enh Labelled.svg IGFET N-Ch Enh Labelled simplified.svg IGFET N-Ch Dep Labelled.svg N-channel
JFET MOSFET enh MOSFET dep
JFET and IGFET symbols
Transistors are categorized by
  • Semiconductor material: graphene, germanium, silicon, gallium arsenide, silicon carbide, etc.
  • Structure: BJT, JFET, IGFET (MOSFET), IGBT, "other types"
  • Polarity: NPN, PNP (BJTs); N-channel, P-channel (FETs)
  • Maximum power rating: low, medium, high
  • Maximum operating frequency: low, medium, high, radio frequency (RF), microwave (The maximum effective frequency of a transistor is denoted by the term fT, an abbreviation for "frequency of transition". The frequency of transition is the frequency at which the transistor yields unity gain).
  • Application: switch, general purpose, audio, high voltage, super-beta, matched pair
  • Physical packaging: through hole metal, through hole plastic, surface mount, ball grid array, power modules
  • Amplification factor hfe (transistor beta)[14]
Thus, a particular transistor may be described as silicon, surface mount, BJT, NPN, low power, high frequency switch.

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