BF199 is an NPN silicon planar epitaxial RF transistor packaged inTO-92 Plastic with 4A maximum current. This article is going to explain guide details about BF199 for your reference.
https://www.utmel.com/componen....ts/bf199-npn-silicon

Where and How to use BF199?
The BF199 is an RF transistor that can be utilized in a wide range of RF applications, including high-frequency radio and television applications, AM oscillators, IF amplifiers, and so on. Aside from that, it can be utilized for audio purposes.
https://www.utmel.com/components/bf199-npn-sili

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