Because there are no minority carriers
in an FET. As a result, it can switch off faster since no stored charge has to
be removed from the junction area. There are two kinds of unipolar transistors:
JFETs and MOSFETs.
In general, JFETs are more temperature
stable than bipolar transistors. Furthermore, JFETs are typically much smaller
than bipolar transistors. This size difference makes them particularly suitable
for use in ICs, where the size of each component is critical.
