Programmable unijunction transistor
Programmable unijunction transistor is a three-lead electronic semiconductor device with which is similar in characteristic to 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 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.Construction
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.Applications
As of 2012 ON Semiconductor manufactured a part: 2N6027. 2N6028 was also made in the past.
