2n3904 vs 2n390611/7/2023 ![]() ![]() The 2N3904 40V, 200mA NPN transitor with a minimum beta (ß) gain of 80 (I C 1mA, V CE 1V). In this circuit, we add the 2N3904 and 2N3906 NPN/PNP transistor pair in a push-pull configuration to increase output current. Due to this biasing current, 2N3904 goes to the saturation state and the LED turns ON. To provide more current a simple push-pull transistor output stage can be added to increase the amplifiers drive capability. When the switch is closed, the base of the transistor is biased, and current flows to the base of the transistor. When utilizing a transistor in a high-frequency or RF circuit, its (fT) is taken into account. This is a little change that will not affect performance. The total device dissipation of the 2N3904 is 625mW, while the BC547 is 500mW. Im lookng for enhancement-type, as I want the devices to be normally off. The maximum collector current of the 2N3904 is 200mA, while the collector current of the BC547 is 100mA. However, Id like to find similar 'ye ole trusty' MOSFETs to add to my toolbox, so I figured Id ask about it here. Due to this, 2N3904 remains in the cut-off state and the LED does not glow. 2n3904 vs mosfet When doing any manner of low voltage switching in the past, Ive relied on either the 2n3904 or the 2n3906, both 250mA-max devices. Find wholesale 2n3904 transistors, CPU transistor parts, and much more at. And no current flows to the base of the transistor. ![]() When the switch is open, the base of the transistor is not biased. Brief Description on 2N3904: 2N3904 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. The general-purpose discrete junction transistors have corresponding pair marking such as 2N3904 small-signal npn BJT and its 2N3906 pnp complement. 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. ![]() 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. In the circuit diagram given above, 2N3904 is used as a switch to turn ON/OFF an LED connected at the collector terminal. ![]()
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