Programmable unijunction transistor

A programmable unijunction transistor (PUT) is a three-lead electronic semiconductor device which is similar in its characteristics to a unijunction transistor, except that it is programmable. In a unijunction transistor, the base region is divided into two parts by the emitter. The two parts of the base form a voltage divider, which sets the operating point of the UJT. That voltage divider can be programmed with two physical resistors connected to the gate terminal of the PUT. This allows the designer some control over the operating point of the PUT.[2]

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

Construction

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

Applications

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

gollark: It's not like they couldn't just switch to a different provider if whatever that is is bad.
gollark: TJ09: near-instantly responds to API requests which he wants to *kill* because they end up using data from EATW, leaves other requests sitting for ages.
gollark: It... has gone down?
gollark: Sure!
gollark: _continues to be annoyed about API being private despite showing publicly available information_

References
  1. Jim Keith. "Programmable Unijunction Transistor Flasher".
  2. "PUT - Programmable Unijunction Transistor - Working, Construction, Biasing - D&E notes". www.daenotes.com.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.