Spacistor

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title: "Spacistor" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["transistor-types"] topic_path: "general/transistor-types" source: "https://en.wikipedia.org/wiki/Spacistor" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

The spacistor{{cite book | last = Wolf | first = Oswald |author2=R. T. Kramer |author3=J. Spiech |author4=H. Shleuder | title = Special Purpose Transistors: A Self-Instructional Programmed Manual | publisher = Prentice Hall | year = 1966 | pages = 103–117}} was a type of transistor developed in the 1950s as an improvement over the point-contact transistor and the later alloy-junction transistor. It offered much higher speed than earlier transistors. It became obsolete in the early 1960s with the development of the diffusion transistor.

It is composed of a P–N junction with a wide depletion region, inside which two additional contacts are made: the injector and the modulator. The P material was called the base and the N material was called the collector. The injector acted like a BJT (bipolar junction transistor) emitter, the modulator like a base, and the collector like its BJT namesake. It achieved high speed by reducing the charge carrier's transit time.

References

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