The pins of 3904 and 3906 are ECB, and the pins of 9012 and 9013 are EBC. 9013 is for 3906 and 9012 is for 3904.
- Triode the full name should be a semiconductor triode also called a bipolar transistor. Triode is a kind of semiconductor device that controls current. Its function is to amplify weak signals into an electric signal with a larger amplitude and is also used as a non-contact switch transistor.
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The transistor is one of the basic semiconductor components. It has the function of current amplification and is the core component of electronic circuits. The transistor is made of two PN junctions very close to each other on a semiconductor substrate. The two PN junctions divide the entire semiconductor into three parts. The middle part is the base area, and the two sides are the emitter and collector areas. The arrangement is PNP And NPN two kinds.
And if you want to know more about 2n3906 and 2n3904 product detail, please click these links:
https://www.utmel.com/components/2n3906-pnp-transistor-pinout-datasheet-and-circuit?id=183
https://www.utmel.com/components/2n3904-npn-transistor-pinout-datasheet-and-circuit?id=150