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In this mode, the emitter and collector regions switch roles.
The neutral emitter and collector regions are dark blue and the depleted regions hashed light blue.
The values of the constants and are zero due to the following conditions of the emitter and collector regions as and .
A BJT consists of three differently doped semiconductor regions: the emitter region, the base region and the collector region.
The following equations apply to the emitter and collector region, respectively, and the origins , , and apply to the base, collector, and emitter.
Gold provides a good tradeoff between forward voltage drop and reverse recovery time for fast switching bipolar devices, where charge stored in base and collector regions must be minimized.
NPN - transistor's emitter and collector regions are called N-type and base region is called P-type, thus the letters NPN.
In an MCS the positive difference between the voltage of regulation element and conduction voltage drop of MOSFET is applied to location between the collector region and emitter region of the pnp transistor.
The Controlled Avalanche Transit-time Triode (CATT), designed for microwave amplification, has a quite large lightly-doped region between the base and the collector regions, giving the device a collector-emitter breakdown voltage fairly high compared to bipolar transistors of the same geometry.
