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Tunnel diode

A tunnel diode or Esaki diode is a type of semiconductor diode that has effectively "negative resistance" due to the quantum mechanical effect called tunneling. It was invented in August 1957 by Leo Esaki when working at Tokyo Tsushin Kogyo, now... Wikipedia
Invented: Leo Esaki
First production: Sony
Pin configuration: anode and cathode
Working principle: Quantum tunneling