[[File:UJT caratteristica.png|thumb|Graph of PUT characteristic curve, similar to UJT]]
'''Programmable unijunction transistor''' ('''PUT''') is a three-lead [[Electronics|electronic]] [[semiconductor]] device with which is similar in characteristic to [[unijunction transistor]] except that it is [[program (computer)|programmable]]{{explain|date=March. 2019}}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.<ref>{{cite web|url=https://www.daenotes.com/electronics/industrial-electronics/put-programmable-unijunction-transistor|title=PUT - Programmable Unijunction Transistor - Working, Construction, Biasing - D&E notes|website=www.daenotes.com}}</ref>
