9/13/2023 0 Comments 2n3904 pinout![]() If we provide ground to the base pin, then the transistor will be in reverse biased and said to be turn ON. In PNP transistor, by default it’s in ON state, but not to be said perfectly on until the base pin is not grounded. The gain value of the 2N3904 is 300, which controls the transistors amplification. /rebates/2fcomponents2f2n3904-npn-transistor-pinout-datasheet-and-circuit3fid3d150&. When use as a switch, can be operated in saturation region and cut-off region. It's clear that the NOT gate could drive the LED directly, this is just a test setup to use the output of the gate to drive another transistor. Because the 2N3904 is an NPN transistor when the base pin is held at the ground, the collector and emitter are left open (reverse biased), and when a signal is applied to the base pin, the collector and emitter are closed (forward-biased). To be as precise as possible, here are the datasheets of the two transistors used during testing: Apparently, I was wrong, but would really like to understand what causes the difference in this very simple circuit to make one of them work and the other one not. ![]() When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, base, and collector leads. Up until now I was under the impression that they could be exchanged with each other pretty much always. Pinout of 2N3904 The 2N3904 is manufactured in a plastic TO-92 case. If I switch the two transistors for 2N3904, it does not work anymore and the LED stays always off.īoth the BC547A and 2N3904 are simple NPN general purpose transistors. If the push button is NOT pressed, the LED is on, otherwise off - like it is expected with a NOT gate. 2N3904/D NPN General - Purpose Amplifier 2N3904 Description This device is designed as a generalpurpose amplifier and switch. This circuit works perfectly fine when two BC547A transistors are used: The output is used to drive the base of a second transistor that turns on an LED: I am following a very simple schematic which is a NOT gate with a push button as input. ![]()
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