The static induction transistor (SIT) is a type of
field-effect transistor (FET) capable of high-speed and high-power operation, with low distortion and low noise. It is a vertical structure device with short multichannel. The device was originally known as a VFET, with V being short for vertical.
Being a vertical device, the SIT structure offers advantages in obtaining higher breakdown voltages than a conventional FET. For the SIT, the breakdown voltage is not limited by the surface breakdown between gate and drain, allowing it to operate at a very high current and voltage. The SIT has a current-voltage characteristic similar to a
vacuum tube triode and it was therefore used in high-end audio products, including power amplifiers from
Sony in the second half of the 1970s and
Yamaha from 1973-1980. The Sony n-channel SIT had the model number 2SK82 with its p-channel complement named 2SJ28.
Characteristics
An SIT has:
*short channel length
*low gate series resistance
*low gate-source capacitance
*small thermal resistance
*low noise
*low distortion
*high audio frequency power capability
*short turn-on and turn-off time, typically 0.25 μs
History
The SIT was invented by Japanese engineers
Jun-ichi Nishizawa and Y. Watanabe in 1950.
See also
*
SIT-based Audio devices
*
Static induction thyristor
*
JFET
References
{{DEFAULTSORT:Sit/Sith (Static Induction Transistor/Thyristor)
Semiconductor devices
Solid state switches
Power electronics
Japanese inventions