![]() ![]() If you are designing a PCD or Perf board with this component then the following picture from the Datasheet will be useful to know its package type and dimensions. Amplifier modules like Audio amplifiers, signal Amplifier etc.Driver Modules like Relay Driver, LED driver etc.When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulaeĭC Current Gain = Collector Current (I C) / Base Current (I B) Of the above types common emitter type is the popular and mostly used configuration. Some of the configurations used in amplifier circuits are ![]() It can amplify power, voltage and current at different configurations. The value of I B should not exceed mA.Ī Transistors acts as an Amplifier when operating in Active Region. Where, the value of V BE should be 5V for BC547 and the Base current (I B depends on the Collector current (I C). The value of this resistor (R B) can be calculated using below formulae. Anything more than 5mA will kill the Transistor hence a resistor is always added in series with base pin. As mentioned the biasing current should maximum of 5mA. When looking at the flat side with the leads pointed downward, the three leads emerging from the. As discussed a transistor will act as an Open switch during Forward Bias and as a Closed switch during Reverse Bias, this biasing can be achieved by supplying the required amount of current to the base pin. The 2N3904 is manufactured in a plastic TO-92 case. When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. Utilizamos cookies y herramientas similares que son necesarias para permitirte comprar, mejorar tus experiencias de compra y proporcionar nuestros servicios, según se detalla en nuestro Aviso de cookies. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 660 mV. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V CE) or Base-Emitter (V BE) could be 200 and 900 mV respectively. When this transistor is fully biased then it can allow a maximum of 100mA to flow across the collector and emitter. To bias a transistor we have to supply current to base pin, this current (I B) should be limited to 5mA. The maximum amount of current that could flow through the Collector pin is 100mA, hence we cannot connect loads that consume more than 100mA using this transistor. Note: Complete Technical Details can be found at the BC547 datasheet given at the end of this page.īC549, BC636, BC639, 2N2222 TO-92, 2N2222 TO-18, 2N2369, 2N3055, 2N3904, 2N3906, 2SC5200īC547 transistor has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. The 2N3904 is an extremely popular NPN transistor that is used as a simple electronic switch or amplifier that can handle 200 mA (absolute maximum) and frequencies as high as 100 MHz when used as an amplifier. Continuous Collector current (I C) is 100mA.Exports to OrCAD, Allegro, Altium, PADS, Eagle, KiCad, Diptrace & Pulsonix. Bipolar (BJT) Transistor NPN 40 V 200 mA 300MHz 625 mW Through Hole TO-92-3. The main manufacturers and their DataSheet can be downloaded here.BC547 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. Download schematic symbols, PCB footprints, 3D Models, pinout & datasheet for the 2N3904 by EMI. There are also foreign Russian equivalents:Ĭomplementary pair with 2N3906 PNP. If necessary, you can replace this BJT with a 2N3903, but you need to understand what parameters are important in this case and study the technical characteristics of both transistors. You can replace the 2N3904 transistor with the following equivalents: Electrical characteristics 2N3904 (T = +25☌) The maximum storage and operation temperature must be in the range of -50 … +150☌.Īttention! The table below scrolls.Total power dissipation – 625 Milliwatt (mW).Max Collector-Emitter Voltage |Vce| – 40 V.The tests were carried out at a temperature of +25☌. Now consider the maximum specs, since they are the most important and they should be looked at when looking for a replacement and designing new devices. The appearance, geometric dimensions and pin diagram of 2N3904 are shown in the figure. If you position the transistor so that the side with the marking is directly in front of you, and the legs look down, then the legs will be located like this: There are also equivalents in SOT-223 and SOT-23 (MMBT3904), they are marked as “1A”. The pinout 2N3904 will be considered in the TO-92 Package. ![]()
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