When the switch is closed, the base of the transistor is biased, and current flows to the base of the transistor. Due to this, 2N3904 remains in the cut-off state and the LED does not glow. And no current flows to the base of the transistor. When the switch is open, the base of the transistor is not biased. The required resistor value can be easily calculated using Ohm’s law. Proper biasing of the base ensures adequate base current to turn ON the transistor.Ī resistor of 220 Ohm is connected between the load(LED) and the collector terminal to protect the LED from overcurrent.
Npn transistor pinout plus#
The base of the transistor is biased using a 10 K Ohm resistor(R3) in parallel to the 1 K Ohm resistor(R2) plus base-emitter junction resistance(in series). The complete circuit is powered via a 5 V supply. Note: The BC337 is a drop-in replacement for the P2N2222A Transistor.NPN Transistor - Common Emitter out put chara. The BC337 is specifically rated at 50V and 800mA max. In the circuit diagram given above, 2N3904 is used as a switch to turn ON/OFF an LED connected at the collector terminal. This is the BC337, an NPN silicon BJT (Bipolar Junction Transistor).This little transistor can help in your project by being used to help drive large loads or amplifying or switching applications. Given below is the image of 2N3904 transistor TO-92 package dimensions. Specifications of 2N3904 transistor Feature BC547 and BC548 are functionally equivalent transistors. Given below is the list of popular transistors which can be used as a replacement for 2N3904:īC537, BC538, 2N4401, and P2N2222A. Given below is the datasheet of 2N3904 transistor(MMBT3904) in the SOT23 package:ĭownload MMBT3904 transistor datasheet. Given below is the datasheet of the 2N3904 transistor in the TO-92 package:Įlectrical characteristics, current-voltage ratings, and physical dimensions of the 2n3904 transistor are given in detail in this datasheet. 2N3904 is called MMBT3904 in SOT23 or SMD package. This transistor is available in Through-hole and a wide variety of SMD packages(SOT23, SOT223, etc) with TO-92 being the most popular one.
2N3904 pinout has three pins: emitter, base, and collector respectively from left to right(flat side with the leads pointed downward).
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