Programmable unijunction transistor

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Programmable unijunction transistor
InventedGeneral Electric[1]
Pin configurationanode, gate and cathode
Electronic symbol
PUT symbol.png
Graph of PUT characteristic curve, similar to UJT

Programmable unijunction transistor (PUT) is a three-lead electronic semiconductor device with which is similar in characteristic to unijunction transistor except that it is programmable[further explanation needed].[2]


In construction, Programmable unijunction transistor is similar to Silicon controlled rectifier. It consists of four layers, two p-type layers and two n-type layers in equal proportion.[1]


As of 2012 ON Semiconductor manufactured a part: 2N6027. 2N6028 was also made in the past.[1]


  1. ^ a b c Jim Keith. "Programmable Unijunction Transistor Flasher".
  2. ^ "PUT - Programmable Unijunction Transistor - Working, Construction, Biasing - D&E notes".