![]() In integrated version, all 3 contacts appear on the top surface.In discrete, the substrate can be used for one connection, typically the collector.BJT can be made either as discrete devices or in planar integrated form.The First BJT Transistor Size (3/8”L X 5/32”W X 7/32”H) No Date Codes. ![]() The three layers of the sandwich are conventionally called the Collector, Base, and Emitter.There are therefore two kinds of BJT, the NPN and PNPvarieties.A bipolar transistor essentially consists of a pair of PN Junction diodes that are joined back-to-back.Field Effect Transistors (FETs) are “unipolar” transistors since their operation depends primarily on a single carrier type.The term “bipolar” was tagged onto the name to distinguish the fact that both carrier types play important roles in the operation.It did not become practical until the early 1950s.Initially known simply as the junction transistor. ![]()
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