Pentode transistor
Encyclopedia

Early pentode transistors

One early pentode transistor was developed in the early 1950s as an improvement over the point-contact transistor
Point-contact transistor
A point-contact transistor was the first type of solid-state electronic transistor ever constructed. It was made by researchers John Bardeen and Walter Houser Brattain at Bell Laboratories in December 1947. They worked in a group led by physicist William Bradford Shockley...

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  • A point-contact transistor having three emitters. It became obsolete in the middle 1950s.

Pentode field-effect transistors having 3 gates, similar to vacuum tube pentodes have also been described

Modern pentode transistors

  • Triple emitter transistor in three input transistor-transistor logic
    Transistor-transistor logic
    Transistor–transistor logic is a class of digital circuits built from bipolar junction transistors and resistors. It is called transistor–transistor logic because both the logic gating function and the amplifying function are performed by transistors .TTL is notable for being a widespread...

     gates.
  • Triple collector transistor in three output integrated injection logic
    Integrated injection logic
    Integrated injection logic is a class of digital circuits built with multiple collector bipolar junction transistors . When introduced it had speed comparable to TTL yet was almost as low power as CMOS, making it ideal for use in VLSI integrated circuits...

     gates.
  • Field effect transistor having three gates.
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