Bipolar junction transistor - History

In December 1947 the point-contact transistor was invented at the laboratory called ‘Bell Telephone’ by Walter Brattain and John Bardeen under the direction of William Shockley. The junction version known as the bipolar junction transistor, invented by Shockley, enjoyed three decades as the device of choice in the design of discrete and integrated circuits. Nowadays, the use of the BJT has declined in favor of CMOS technology in the design of digital integrated circuits.