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 Info:
- 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
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2n3906 Basic Info:
- Transistor type: PNP
- Current-Collector (Ic) (Max): 200mA
- voltage-collector emitter breakdown (maximum): 40V
- Vce saturation under Ib and Ic conditions (maximum): 400mV @ 5mA, 50mA
- Minimum DC current gain (hFE) at a certain Ic, Vce: 100 @ 100mA, 1V
- Power-Maximum: 625mW
- Frequency-Conversion: 250MHz
- Package/Shell: TO-92-3, TO-226
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As people said that the basic difference between 2N3904 and 2N3906 is that former is NPN transistor and later is PNP.
Npn and pnp are mainly different in current direction and positive and negative voltage.
NPN uses the B-E current (IB) to control the C-E current (IC), the E pole has the lowest potential, and usually the C pole has the highest potential during normal amplification, that is, VC "VB" VE.
PNP uses the E-B current (IB) to control the E-C current (IC). The E pole has the highest potential, and usually the C pole has the lowest potential during normal amplification, that is, VC "VB "VE.
The NPN base has a very high voltage, and the collector and emitter are short-circuited. Low voltage, open collector and emitter. It just doesn't work.
PNP base is extremely high voltage. The collector and emitter are open, that is, they don't work. If the base is applied with a low potential, the collector and emitter are short-circuited.
A. If the input is a high level and the output needs a low level, first select npn.
B. If the input is a low level, and the output needs a low level, first select pnp.
C. If the input is a low level and the output needs a high level, first select npn.
D. If the input is a high level, and the output needs a high level, the first choice is pnp.
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