Complementary transistors

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Unlike what impractical textbooks tell you, very few of certain transistor types are made.

Due to semiconductor chemistry and physics, P-type devices are somewhat slower than N-type transistors. Therefore, there is no such a thing as "perfect complementary" devices.

Depletion mode MOSFETs, in terms of purchase availability, do not really exist.

P-channel MOSFETs are hard to find for purchase.


For BJTs, complementary devices are widely available. For example, see my [RadioShack Transistors Datasheets] page.

For MOSFETs, there are very few complementary transistors.