San José State University
Department of Economics
Thayer Watkins
Silicon Valley
& Tornado Alley

The History of the Transistor

The crucial component of an electronic device is a controllable valve that lets a weak signal control a much larger flow much as a faucet controls the flow of water. At one time the controllable valve used in electronic circuits was the vacuum tube. The vacuum tube worked but it was bulky and used a lot of electrical power that ended up as heat which shortened the life of the tube itself. The transistor was a much more elegant solution to the needs of electronics. The transistor is small and uses much, much less power than the vacuum tube. Because it uses so little power there is little heat to dissipate and the transistor does not fail so quickly as does a vacuum tube.

The transistor was successfully demonstrated on December 23, 1947 at Bell Laboratories in Murray Hill, New Jersey. Bell Labs is the research arm of American Telephone and Telegraph (AT&T). The three individuals credited with the invention of the transistor were William Shockley, John Bardeen and Walter Brattain. William Shockley played a quite different role in the invention than the other two. Shockley had been working on the theory of such a device for more than ten years. While he could work out the theory successfully but after eight years of trying he could not build a working model. Bardeen and Brattain were called in to handle the engineering and development, which they did in the relatively short time of two years, to the consternation of Shockley. Shockley, as their supervisor, shared in the glory. What Bardeen and Brattain had created was the "point-contact" transistor. Shockley subsequently designed a new type of transistor called the "bipolar" transistor which was superior to the point- contact type and replaced it. Thus the transitor was, in large part, Shockley's creation.

William Shockley was raised in Palo Alto, the son of a mining engineer and his Stanford-educated wife. He did his undergraduate work at the California Institute of Technology (Cal Tech) in Pasadena and went on for his Ph.D. in physics at M.I.T. When he completed his doctorate, specializing in quantum physics, he went to work for Bell Labs.

Shockley had started working in 1936 on the solid state physics theory that was the basis for the transistor. There was a precedence for this type of device. The early radios had signal detectors which consisted of a fine wire, called a cat's whisker, impinging upon a galena (lead sulfide) crystal. The radio user had to move the cat's whisker around upon the germanium crystal to find a suitable point of contact where a radio signal could be picked up. These early radios worked but only imperfectly. Nevertheless the principle upon which the crystal detector worked was the basis for the "point-contact" transistor. Bardeen and Brattain used germanium instead of galena in that first transistor. They also used the equivalent of cat's whiskers, but two rather than one. Shockley's design, the bipolar transistor, eliminated the delicate, troublesome point contacts. Later transistors were made from silicon, a much more common element and one that was protected from corrosion by a thin layer of silicon dioxide.

Texas Instruments of Dallas, Texas first started commercial production of junction transistors for portable radios in 1954. The Sony Company of Japan soon purchased the technology and the right to produce transistors and came to dominate the market. In the 1960's Sony began to manufacture television sets using transistors rather than vacuum tubes. Soon afterwards vacuum tube technology became obsolete.

In 1956 Shockley returned to Palo Alto to founded his own company. He brought talented engineers and scientists to his company but he was a very difficult person to work with and seemed to have bizaar notions of how to manage an enterprise. For one thing, he required his employees to complete psychological examines such as I.Q. test. He insisted upon posting of the salaries of all the employees. This produced unnecessary friction among the employees. Probably worst of all was that he would erratically change the direction of research. He would jerk them away from one line of research and start another line of research and then revert to the previous line after the new line proved impractical.

The top staff, which included Robert Noyce and Gordon Moore, began to feel that they were never going to complete a development as long as they were under the direction of Shockley. Ultimately they joined together in leaving the company. They wanted to continue to work together in another company and and approached the venture capitalist Arthur Rock to find them an employer. Many firms were interested but not willing to invest the necessary capital. Eventually someone thought of Steven Fairchild of Fairchild Camera. He was interested and was induced to create Fairchild Semiconductor for the group. A new facility was built in the San Jose. Soon it was producing transistors. In the early days, shortly after the Soviet Union launched Sputnik, the primary market for the products of Fairchild was the Federal government. Fairchild Semiconductor was a great success. It was soon producing more profit for Steven Fairchild than the rest of Fairchild Camera. When Fairchild Camera needed a new CEO and Robert Noyce was passed over Noyce and Moore decided to leave Fairchild. They started Intel, one of the most important technological enterprises of the world.

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