# Transistor A semiconductor device that amplifies or switches electronic signals, first demonstrated on December 23, 1947 at [[wiki/Bell Labs|Bell Labs]] by [[wiki/William Shockley|William Shockley]], [[wiki/John Bardeen|John Bardeen]], and [[wiki/Walter Brattain|Walter Brattain]]. The transistor replaced vacuum tubes and became the foundational component of all modern electronics, enabling the digital revolution. The invention earned Bardeen, Brattain, and Shockley the 1956 [[wiki/Nobel Prize|Nobel Prize]] in Physics. The transistor's creation and its propagation through [[wiki/Silicon Valley|Silicon Valley]] are central to [[articles/Bell Labs and the Distributed Architecture of American Power|Bell Labs and the Distributed Architecture of American Power]].