2n3904 and 2n3906 are both triodes. The full name should be semiconductor triodes, also called bipolar transistors and transistors. They are semiconductor devices that control current. Their function is to amplify weak signals into electrical signals with larger amplitudes. They are also used as Non-contact switch. Transistor is one of the basic semiconductor components. It has the function of current amplification and is the core component of electronic circuits. The triode 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.
2n3904 basic information:
Transistor type: NPN
Current-Collector (Ic) (Max): 200mA
voltage-collector emitter breakdown (maximum): 40V
Vce saturation under Ib and Ic conditions (maximum): 500mV @ 50mA, 500mA
Minimum DC current gain (hFE) at a certain Ic, Vce: 100 @ 150mA, 10V
Power-Maximum: 800mW
Frequency-Conversion: 100MHz
Package/Shell: TO-39-3, TO-205AD, metal can
2n3906 basic information:
Transistor type: PNP
current-collector (Ic) (maximum): 200mA
voltage-collector emitter breakdown (maximum): 40V
Vce saturation under Ib and Ic conditions (maximum): 400mV @ 5mA, 50mA
The minimum DC current gain (hFE) at a certain Ic, Vce: 100 @ 10mA, 1V
Power-Maximum: 625mW
Frequency-Conversion: 250MHz
Package/Shell: TO-92-3 (standard body), TO-226
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