The two types of standard transistors are PNP and NPN which differs in circuit symbols. The layers of semiconductor material used to make the transistor are denoted by the letters. To keep a straight ...

In the early days, PNP bipolar transistors were common, but the bulk of circuits you see today use NPN transistors. As [Aaron Danner] points out, many people think PNP transistors are “backward” but ...

The 2SA1648 is a PNP silicon epitaxial transistor featuring fast switching speed for high current control. It features low collector saturation voltage, as well as high DC current gain and excellent ...

This image taken with a transmission electron microscope shows the cross section of a new type of transistor shaped like a Christmas tree that was created by researchers at Purdue and Harvard ...