A CDE Definition
Also called a "bipolar junction transistor" (BJT), it is one of two major transistor categories; the other is "field effect transistor" (FET). Although the first transistors and first silicon chips used bipolar transistors, most chips today are field effect transistors wired as CMOS logic, which consume less power (see FET and MOSFET).
Bipolar transistors are available as individually packaged discrete components as well as by the hundreds of thousands on a single chip.
High Power, High Frequency
Although the overall market for bipolar transistors has decreased, they are still used for high power applications and high radio frequency (RF) applications that reach into the gigahertz range. For example, from 1997 to 2002, worldwide sales of bipolar chips dropped from USD $1.5 billion to $226 million, the latter out of a total semiconductor market of $136 billion. See transistor, IGBT and BiCMOS.
The First Transistor Was Bipolar
NPN Bipolar Transistor
Bipolars Use More Power
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Terms By Topic
Click any of the following categories for a list of fundamental terms.