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3FT 晶体管(国外叫 PUT,即 Progra-mball Unijunction Transistor 的缩写,我国有的单位译作可编程序单结晶体管,我们暂称3FT 晶体管。)是近年来出现的一种新型的四层三端负阻器件,它是由 PNP 型和 NPN 型晶体管以特殊结构组成很强正反馈的互补管。由于其结构与工艺的特殊性,跟一般的普通负阻器件相比,具有灵敏度高,脉冲上升时间快,动态电阻低,漏电流小、应用简便灵活,工作稳定等一系列突出的优点。特别是在一些脉冲开关电路中,以简化线路,提高线路技术指标,运用简便等特点而居显
3FT transistor (called PUT abroad abbreviation of Progra-mball Unijunction Transistor, some units in our country translated as programmable single-junction transistor, we tentatively called 3FT transistor) is a new type of four-terminal three-terminal negative resistance Device, it is a PNP-type and NPN-type transistor with a special structure of a strong positive feedback of complementary tubes. Due to the particularity of its structure and technology, compared with ordinary negative resistance devices, it has a series of outstanding advantages such as high sensitivity, fast rise time of pulse, low dynamic resistance, small leakage current, simple and flexible application, stable operation and so on. Especially in some pulse switch circuit, in order to simplify the line, improve line technical indicators, the use of simple and so significant