10.5 - THE SOLID STATE DOMAIN
Fig. 269- the miniature valve compared with the first Germanium TRANSISTORS.



In the occasion of its lauching in 1948, even considering its advanced scientific technological concept which arose an enormous array of pratical applications, in the beginning, TRANSISTOR was slow appretiate by the electronic industry still confident in the thermionic valve as its utmost versatile component, in spite of its several handicap such as: fragility, expensive machinery for the manufacturing of its complex mechanical parts and so forth. Fig 269
Therefore, in the early fifties, since the invention of the point contact TRANSISTOR, has resulted in both acceleration and expansion of its development activity. For historical allocation purpose the steps of such evolution can be evaluated considering the following chronology:

DATA
TECNOLOGY
1954
SILICON TRANSISTOR
1955
MESA TRANSISTOR
1959
PLANAR TRANSISTOR
1960
FIELD EFFECT TRANSITOR - FET