Apentode transistor is anytransistor having five active terminals.

One early pentode transistor was developed in the early 1950s as an improvement over thepoint-contact transistor.

• A point-contact transistor having three emitters. It became obsolete in the middle 1950s.

Pentode field-effect transistors having 3 gates, similar to vacuum tube pentodes have also been described^[1]

• Triple emitter transistor in three inputtransistor-transistor logic gates.
• Triple collector transistor in three outputintegrated injection logic gates.
• Field effect transistor having three gates.

• Transistor types