2n3904 pinout download8/26/2023 The main manufacturers and their DataSheet can be downloaded here. 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”. If you are designing a PCB or Perf board with this component, then the following picture from the 2N3904 transistor Datasheet will be useful to know its package type and dimensions.The pinout 2N3904 will be considered in the TO-92 Package. Commonly used in TV and other home appliances.VCB and VBE is high hence can be used to control voltage loads up to 40V.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 (IC) / Base Current (IB) 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 IB should not exceed mA.Ī Transistors acts as an Amplifier when operating in Active Region. Where, the value of VBE should be 5V for 2N3904 and the Base current (IB depends on the Collector current (IC). The value of this resistor (RB) 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. 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. When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. 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 600 mV. NovemThis post describes 2N3904 transistor information about pinout, equivalent, uses, description, how to use and where to use in an electronic circuit.Here is an image showing the pin diagram of this transistor. 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. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (VCE) or Collector-Base (VCB) could be 40V and 60V respectively. The 2N3904 is manufactured in a plastic TO-92 case. When this transistor is fully biased then it can allow a maximum of 200mA to flow across the collector and emitter. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA. The maximum amount of current that could flow through the Collector pin is 200mA, hence we cannot connect loads that consume more than 200mA using this transistor. 2N3904 has a gain value of 300 this value determines the amplification capacity of the transistor. Note: Complete Technical Details can be found at the 2N3904 datasheet given at the end of this page.īC549, BC636, BC639, 2N2222 TO-92, 2N2222 TO-18, 2N2369, 2N3055, 2N3906, 2SC5200ĢN3904 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. Continuous Collector current (IC) is 200mA 2N3904 MMBT3904 PZT3904 P D Total Device Dissipation Derate above 25☌ 625 5.0 350 2.8 1,000 8.0 mW mW/☌ RJC Thermal Resistance, Junction to Case 83.3 ☌/W RJA Thermal Resistance, Junction to Ambient 200 357 125 ☌/W Device mounted on FR-4 PCB 1.6' X 1.6' X 0.06.
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