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The 2N3904 is a commonly used NPN Bipolar Junction Transistor. There are a fair number of 2N3904 in the Joe Knows electronics semiconductor kit. Affiliate link added below.
As always, you need to be aware of the pin layout of any transistor you are using. While looking at the front of the 2N3904, and the pins pointing downwards, the left pin is the Emitter, the middle pin is the Base, and the right pin is the Collector. Always do a google search for the datasheet of any transistor you are using, to verify it’s pin layout.
Some 2N3904 basic electrical Properties:
These are Absolute maximum values according to 1 or more datasheets. Always consult datasheets yourself. Especially if you know the manufacturer of the component that you have.
- Ic (Collector Current) 0f 200mA (Max).
- hFE (DC current gain): Varies by amount of collector current. IC means collector current. 1mA = 0.001A.
- IC = 0.1mA: min 60.
- IC = 1mA: min 80.
- IC = 10mA: min 100. and max. 300
- IC = 50mA: min 60.
- IC = 100mA: min 30.
- TF (transition frequency): 300Mhz
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